CN106521335B - A kind of high strength and ductility TRIP Steel Bars and equal channel corner extrusion preparation method - Google Patents
A kind of high strength and ductility TRIP Steel Bars and equal channel corner extrusion preparation method Download PDFInfo
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- CN106521335B CN106521335B CN201610960981.3A CN201610960981A CN106521335B CN 106521335 B CN106521335 B CN 106521335B CN 201610960981 A CN201610960981 A CN 201610960981A CN 106521335 B CN106521335 B CN 106521335B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
A kind of high strength and ductility TRIP Steel Bars and equal channel corner extrusion preparation method；Bar constituent mass percentage composition：C：0.15~0.20%, Mn：1.30~1.50%, Si：0.50~0.70%, A1：0.50~0.60%, Nb：0.02~0.05%, S：＜ 0.01%, P：＜ 0.01%, surplus Fe and inevitable impurity, 8~15mm of diameter；Method：1) smelted by bar composition, be cast into ingot casting；Slab is forged into after insulation；2) heating of plate blank is incubated, and is carried out hot rolling, is air-cooled to room temperature and obtains hot rolled plate；3) turning goes out bar, carries out Equal-channel Angular Pressing using path C, obtains extruded barses；4) extruded barses are quenched to Bainite Region insulation, are air-cooled to room temperature and obtain high strength and ductility TRIP Steel Bars after two-phase section insulation；The present invention improves mechanical property by Equal-channel Angular Pressing combination TRIP steel heat treatment process, refining grain size：Tensile strength is 720~760MPa, and elongation percentage is 34~40%, and strength and ductility product is 25~30GPa%.
Description
Technical field
The invention belongs to material processing field, and in particular to a kind of high strength and ductility TRIP Steel Bars and Equal-channel Angular Pressing
Preparation method.
Background technology
At present, fast traffic lane of the automobile industry in China in development, as the development of auto industry is to high strength steel
Application driving force it is increasing；And auto industry will to lightweight, safety, discharge, cost control and fuel economy
More and more higher is sought, this just drives auto industry using high-strength steel sheet and some High-strength light-weight materials.And phase change induction is moulded
Property steel (Transformation Induced Plasticity, TRIP) just belong to this kind of material, the appearance of TRIP steel is solves
The contradiction of intensity and plasticity provides direction, and the essence of TRIP steel is by phase change induction plasticity effect so that Ovshinsky in steel
Body strain induced martensite in plastic history is given birth to core and grown up, and produces differential hardening, then deforms and no longer concentrates on part,
Phase transformation is set uniformly to be diffused into whole material to improve the intensity of steel plate and plasticity.TRIP steel plates have high yield strength and tension
Intensity, ductility is strong, and stamping ability is high, wherein, the strength and ductility product of first generation high-strength steel-conventional TRIP steel is typically in 15-
20GPa%, the strength and ductility product of third generation high-strength steel-middle manganese TRIP steel can mitigate car weight as autobody sheet, drop in 20-40GPa%
Low oil consumption, while the ability of energy absorption is strong, can resist plastic deformation during shock, significantly improves safety of automobile etc.
Level.How the plasticity, toughness and work hardening capacity of grained material is improved, it has also become domestic and international metal material field is generally closed
The important scientific problems of note.
In conventional TRIP structure of steel, relative to ferrite, the solution strengthening of alloying element and the enrichment of carbon cause
Retained austenite exists as a kind of hard phase constitution, in deformation process, distributes the relative collection of stress/strain in retained austenite
In, too early deformation induced austenite phase transformation influences raising of the TRIP effects to plasticity, toughness and work hardening capacity.Then
Need to find the method that a kind of too early stress/strain of scattered retained austenite is concentrated, on the premise of alloying element is not added, carefully
It is the method that a kind of too early stress/strain of scattered retained austenite is concentrated to change ferrite crystal grain, meanwhile, the retained austenite of refinement
With higher stability.
Equal channel angular pressing texturing (Equal Channel Angular Pressing, abbreviation ECAP) belongs to violent modeling
Property deformation (Severe Plastic Deformation, abbreviation SPD) technology one kind, it does not changing material cross-section product
In the case of, the large plastometric set to material is realized in a manner of pure shear, the ECAP deformations per a time can all apply non-to sample
Often uniform strong strain, very big accumulative strain can be achieved in multi-pass ECAP deformations, it is hereby achieved that sub-micron crystal is very
To nanocrystalline material.So equal channel angular pressing texturing (ECAP) technology is as preparing block sub-micron or nano material
Effective ways, it is often used in and prepares super fine crystal material.
TRIP Heat-Treatment of Steel techniques are divided into two steps：(1) intercritical annealing；(2) Bainite Region isothermal is incubated, subsequent air cooling
To room temperature.This patent is deformed by ECAP and combines appropriate Technology for Heating Processing, can effective refiner material crystallite dimension, leading to
While crossing fining ferrite grains and concentrated to disperse the too early stress/strain of retained austenite, the residual austenite physical efficiency of refinement carries
Its high stability, the comprehensive mechanical property for improving TRIP Steel Bars.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of high strength and ductility TRIP Steel Bars and prepared by Equal-channel Angular Pressing
Method；By rationally designing the composition of steel, through steel-making-forging-hot rolling-machining pole-Equal-channel Angular Pressing-TRIP techniques
Heat treatment, it is therefore an objective to by equal channel angular pressing texturing crystal grain thinning and combine appropriate Technology for Heating Processing, be made with height
The low-carbon Si-Mn TRIP Steel bar of strength and ductility product.
The high strength and ductility TRIP Steel Bars of the present invention, the weight/mass percentage composition of its chemical constituent are：C：0.15~0.20%,
Mn：1.30~1.50%, Si：0.50~0.70%, Al：0.50~0.60%, Nb：0.02~0.05%, S：＜ 0.01%, P：
＜ 0.01%, surplus are Fe and inevitable impurity.
Described high strength and ductility TRIP Steel Bars, its a diameter of 10 ± 0.3mm.
Described high strength and ductility TRIP Steel Bars, its tensile strength are 720~760MPa, and elongation percentage is 34~40%, by force
It is 25~30GPa.% to mould product.
The equal channel corner extrusion preparation method of the high strength and ductility TRIP Steel Bars of the present invention, comprises the following steps：
Step 1, slab is prepared：
After composition according to high strength and ductility TRIP Steel Bars is smelted and cast, slab is forged into；
Step 2, hot rolling：
(1) by slab, 2~3h is incubated at 1200~1250 DEG C；
(2) by the slab after insulation, after carrying out multistage hot deformation immediately, room temperature is air-cooled to, hot rolled plate is made；Wherein, eventually
Temperature is rolled for 900~950 DEG C, and always accumulative reduction ratio is 56~64%；
Step 3, Equal-channel Angular Pressing：
Got on the bus from hot rolled plate and cut out bar, carry out Equal-channel Angular Pressing, extruded barses are made；Wherein, equal channel angular
The path of extruding uses path C modes, and extrusion temperature is 380~420 DEG C, and extruding force be 45~55MPa, extrusion speed for 4~
6mm/min, if extruding passage is more than 1 time, after every time extruding, next passage is carried out after injection port bar rotates 180 °
Extruding；
Step 4, two-step thermal processing：
By extruded barses, after being incubated at a temperature of two-phase section, Bainite Region insulation is quenched to rapidly, is finally air-cooled to room
Temperature, high strength and ductility TRIP Steel Bars are made.
In described step 1, Forge Heating temperature is 1180~1220 DEG C, 1.5~2.5h of soaking time, forging deformation temperature
Spend the slab for for 950~1100 DEG C, being forged into that thickness is 30~35mm.
In described step 2 (2), 3~5 passage hot rollings are carried out altogether.
In described step 2 (2), single pass reduction ratio is 20~25%.
In described step 2 (2), hot rolling plate thickness is 11~13mm.
In described step 3,1~4 passage Equal-channel Angular Pressing is carried out altogether.
In described step 3, path C modes refer to metal bar after a time is extruded, after lower a time rotation 180 degree
Extruding.
In described step 4, two-phase section temperature is 780~820 DEG C, and two-phase section is incubated 4~6min.
In described step 4, two-phase section insulation is carried out in the salt bath furnace of chlorate.
In described step 4, Bainite Region temperature is 380~430 DEG C, and Bainite Region is incubated 2~5min.
In described step 4, Bainite Region insulation is carried out in the salt bath furnace of nitrate.Described nitrate is nitrous acid
The mixture of sodium and potassium nitrate.
The high strength and ductility TRIP Steel Bars of the present invention, composition design is reasonable, on the basis of C, Si and Mn is added, with A1 portions
Divide substitution Si to reduce the silicone content in steel, while add a small amount of microalloy element Nb.Wherein, C element mainly useful for improves
The stability of austenite, Si do not dissolve in cementite, and it is strong to play stronger solid solution while stabilization of austenite is improved
Change acts on, and replaces Si to be advantageous to improve the surface property of bar material with Al parts, and Nb addition can crystal grain thinning so that steel is bent
Take intensity and tensile strength increases.
The equal channel corner extrusion preparation method of the high strength and ductility TRIP Steel Bars of the present invention, utilizes Equal-channel Angular Pressing
(ECAP) make material that violent plastic deformation, the crystallite dimension of abundant refiner material, later in conjunction with appropriate heat treatment work occur
Skill, experiment steel is annealed in two-phase section, then quench into Bainite Region isothermal, be finally air-cooled to room temperature, brilliant by fining ferrite
While grain is concentrated to disperse the too early stress/strain of retained austenite, the residual austenite physical efficiency of refinement improves its stability, so as to
Improve its comprehensive mechanical property.
Intensity and plasticity are effectively bonded together by high strength and ductility low-carbon Si-Mn TRIP Steel bar prepared by the present invention,
Comprehensive mechanical property is superior：The present invention high strength and ductility low-carbon Si-Mn TRIP Steel bar, its tensile strength be 720~
760MPa, elongation percentage are 34~40%, and strength and ductility product is 25~30GPa%；And the non-ECAP deformations+TRIP heat treatments of traditional handicraft
The tensile strength of the bar of technique is 768MPa, elongation percentage 28.2%, strength and ductility product 21.6GPa%；It can be seen that present invention side
High strength and ductility low-carbon Si-Mn TRIP Steel bar prepared by method, 15~40% are improved compared to traditional handicraft.
Brief description of the drawings
In the equal channel corner extrusion preparation method of the high strength and ductility TRIP Steel Bars of Fig. 1 embodiment of the present invention 2~4 etc.
Channel angular extrusion (ECAP) principle schematic；
It is corresponding in the equal channel corner extrusion preparation method of the high strength and ductility TRIP Steel Bars of Fig. 2 embodiment of the present invention 2~4
Step 4 two-phase section annealing heat treatment process schematic diagram；
Experiment reference prepared by high strength and ductility TRIP Steel Bars and comparative example prepared by Fig. 3 embodiment of the present invention 2~4
TRIP Steel Bars carry out tensile sample schematic diagram during tension test；
Experiment reference prepared by high strength and ductility TRIP Steel Bars and comparative example prepared by Fig. 4 embodiment of the present invention 2~4
Metallographic microstructure (OM) figure before TRIP Steel Bar stretcher strains；Wherein, (a) corresponding comparative example, (b) corresponding embodiment 2,
(c) corresponding embodiment 3, (d) corresponding embodiment 4；
Experiment reference prepared by high strength and ductility TRIP Steel Bars and comparative example prepared by Fig. 5 embodiment of the present invention 2~4
The stress-strain curve of TRIP Steel Bars.
Embodiment
University's rolling technique and tandem rolling automate National Key Laboratory to the milling train used in following examples northeast
(RAL) Φ 450mm Hot Rolling Mills.
The Equal-channel Angular Pressing equipment used in following examples comes from Univ Melbourne Australia.
The equipment that room temperature simple tension is carried out in following examples is Northeastern University ATM laboratories from Amada Co., Ltd. island
Tianjin makes bought 100kN electronic universal testers, model specification AG-Xplus100kN.
The equipment that metallographic structure is observed in following examples is OLYMPUS-GSX500 light microscopes.
The equipment that microstructure is observed in following examples is SSX-550 SEM, FEI Tecnai
G2F20S-TWIN type Flied emission transmission electron microscopes.
The sensing equipment of retained austenite volume fraction is Smartlab X-ray diffractometers in following examples.
Two-step thermal processing is using well formula salt bath furnace in following examples, and two-phase section annealing is sodium chloride, bayesian
When body is incubated is the nitrate of natrium nitrosum and potassium nitrate composition.
In following examples, the TRIP Steel Bars of the high strength and ductility TRIP Steel Bars of preparation and experiment reference are processed into
Size tensile sample as shown in Figure 3, then be heat-treated, polished with sand paper, then carry out stretching experiment, draw speed
For 1mm/min until breaking, whole process is automatically controlled by computer program.
In following examples, aliquot is cut near tensile sample fracture, with coated abrasive working, on electropolisher,
Polishing, polishing fluid are the mixed liquor of 900ml alcohol and 60ml perchloric acid, and polishing voltage is 25V, polishing time 20s, has been polished
Cheng Houyong alcohol is rinsed；Then sample is corroded with 4% nitric acid alcohol, etching time 7s, after etching
It is rinsed with alcohol.
Passage is waited in the equal channel corner extrusion preparation method of the high strength and ductility TRIP Steel Bars of example 2 below~4
Corner extrusion (ECAP) principle schematic is as shown in Figure 1.
Step 4 is corresponded in the equal channel corner extrusion preparation method of the high strength and ductility TRIP Steel Bars of example 2 below~4
Two-phase section annealing heat treatment process schematic diagram is as shown in Figure 2.
Comparative example
A kind of TRIP Steel Bars as experiment reference, the weight/mass percentage composition of its chemical constituent are：C：0.18%,
Mn：1.39%, Si：0.66%, Al：0.58%, Nb：0.036%, surplus is Fe and inevitable impurity.
The preparation method of the TRIP Steel Bars of above-mentioned experiment reference, comprises the following steps：
Step 1, slab is prepared：
(1) according to experiment with reference to TRIP Steel Bars ingredient composition smelt and cast after, be forged into 30 × 80 ×
120mm slabs, wherein Forge Heating temperature are 1180 DEG C, soaking time 1.5h, and forging deformation temperature is 950~1100 DEG C；
Step 2, hot rolling：
(1) by slab, 2h is incubated at 1200 DEG C；
(2) by the slab after insulation, after carrying out 4 passage hot rollings immediately, room temperature is air-cooled to, the hot rolling that thickness is 11mm is made
Plate；Wherein, finishing temperature is 900 DEG C, and always accumulative reduction ratio is 63%, and single pass reduction ratio is more than 20%；
Step 3, two-step thermal processing：
Got on the bus from hot rolled plate and cut out bar of the size for 10 × 70mm of Φ, then deformed bar without ECAP, directly
After being incubated 5min at 800 DEG C of two-phase section temperature, 400 DEG C of insulation 3min of Bainite Region temperature are quenched to rapidly, are finally air-cooled to
Room temperature, the TRIP Steel Bars of experiment reference are made.
The TRIP Steel Bars of experiment reference manufactured in the present embodiment, carry out tension test, the metallographic before its stretcher strain
Microscopic structure (OM) is such as shown in Fig. 4 (a), curve (non-ECAP deformations+TRIP techniques heat treatment) in load-deformation curve such as Fig. 5
Shown, the steel yield strength is 511MPa, tensile strength 768MPa, elongation percentage 28.2%, and strength and ductility product is
21.6GPa%.
Embodiment 2
A kind of high strength and ductility TRIP Steel Bars, the weight/mass percentage composition of its chemical constituent are：C：0.18%, Mn：1.39%,
Si：0.66%, Al：0.58%, Nb：0.036%, surplus is Fe and inevitable impurity.
The equal channel corner extrusion preparation method of above-mentioned high strength and ductility TRIP Steel Bars, comprises the following steps：
Step 1, slab is prepared：
After ingredient composition according to the TRIP Steel Bars of experiment reference is smelted and cast, 30 × 80 × 120mm is forged into
Slab, wherein Forge Heating temperature are 1180 DEG C, soaking time 2.5h, and forging deformation temperature is 950-1100 DEG C；
Step 2, hot rolling：
(1) by slab, 3.0h is incubated at 1200 DEG C；
(2) by the slab after insulation, after carrying out 4 passage hot rollings immediately, room temperature is air-cooled to, the hot rolling that thickness is 12mm is made
Plate；Wherein, finishing temperature is 920 DEG C, and always accumulative reduction ratio is 60%, and single pass reduction ratio is more than 20%；
Step 3, Equal-channel Angular Pressing：
Got on the bus from hot rolled plate and cut out bar of the size for 10 × 70mm of Φ, carried out 1 passage Equal-channel Angular Pressing, be made and squeeze
Pressure bar material；Wherein, the path of Equal-channel Angular Pressing uses path C modes, and extrusion temperature is 400 DEG C, extruding force 50MPa,
Extrusion speed is 5mm/min；
Step 4, two-step thermal processing：
By extruded barses, after being incubated 5min at 800 DEG C of two-phase section, the 400 DEG C of insulations of Bainite Region temperature are quenched to rapidly
3min, room temperature is finally air-cooled to, high strength and ductility TRIP Steel Bars are made.
High strength and ductility TRIP Steel Bars manufactured in the present embodiment, carry out tension test, the metallography microscope before its stretcher strain
Organize (OM) such as shown in Fig. 4 (b), curve (heat treatment of 1 passage ECAP deformation+TRIP techniques) institute in load-deformation curve such as Fig. 5
Show, the steel yield strength is 617MPa, tensile strength 755MPa, elongation percentage 34.2%, strength and ductility product 25.8GPa%.
Embodiment 3
A kind of high strength and ductility TRIP Steel Bars, the weight/mass percentage composition of its chemical constituent are：C：0.18%, Mn：1.39%,
Si：0.66%, Al：0.58%, Nb：0.036%, surplus is Fe and inevitable impurity.
The equal channel corner extrusion preparation method of above-mentioned high strength and ductility TRIP Steel Bars, comprises the following steps：
Step 1, slab is prepared：
After ingredient composition according to the TRIP Steel Bars of experiment reference is smelted and cast, 30 × 80 × 120mm is forged into
Slab, wherein Forge Heating temperature are 1200 DEG C, soaking time 2.5h, and forging deformation temperature is 950~1100 DEG C；
Step 2, hot rolling：
(1) by slab, 2h is incubated at 1250 DEG C；
(2) by the slab after insulation, after carrying out 4 passage hot rollings immediately, room temperature is air-cooled to, the hot rolling that thickness is 13mm is made
Plate；Wherein, finishing temperature is 950 DEG C, and always accumulative reduction ratio is 56%, and single pass reduction ratio is more than 20%；
Step 3, Equal-channel Angular Pressing：
Got on the bus from hot rolled plate and cut out bar of the size for 10 × 70mm of Φ, carried out 2 passage Equal-channel Angular Pressings, be made and squeeze
Pressure bar material；Wherein, the path of Equal-channel Angular Pressing uses path C modes, and extrusion temperature is 400 DEG C, extruding force 50MPa,
Extrusion speed is 5mm/min, and after the extruding of the 1st passage, the extruding of the 2nd passage is carried out after injection port bar rotates 180 °；
Step 4, two-step thermal processing：
By extruded barses, after being incubated 5min at 800 DEG C of two-phase section, the 400 DEG C of insulations of Bainite Region temperature are quenched to rapidly
3min, room temperature is finally air-cooled to, high strength and ductility TRIP Steel Bars are made.
High strength and ductility TRIP Steel Bars manufactured in the present embodiment, carry out tension test, the metallography microscope before its stretcher strain
Organize (OM) such as shown in Fig. 4 (c), curve (heat treatment of 2 passage ECAP deformation+TRIP techniques) institute in load-deformation curve such as Fig. 5
Show, the steel yield strength is 584MPa, tensile strength 725MPa, elongation percentage 36.5%, strength and ductility product 26.4GPa%.
Embodiment 4
A kind of high strength and ductility TRIP Steel Bars, the weight/mass percentage composition of its chemical constituent are：C：0.18%, Mn：1.39%,
Si：0.66%, Al：0.58%, Nb：0.036%, surplus is Fe and inevitable impurity.
The equal channel corner extrusion preparation method of above-mentioned high strength and ductility TRIP Steel Bars, comprises the following steps：
Step 1, slab is prepared：
After ingredient composition according to the TRIP Steel Bars of experiment reference is smelted and cast, 30 × 80 × 120mm is forged into
Slab, wherein Forge Heating temperature are 1200 DEG C, soaking time 2.0h, and forging deformation temperature is 950~1100 DEG C；
Step 2, hot rolling：
(1) by slab, 2h is incubated at 1220 DEG C；
(2) by the slab after insulation, after carrying out 4 passage hot rollings immediately, room temperature is air-cooled to, the hot rolling that thickness is 11mm is made
Plate；Wherein, finishing temperature is 920 DEG C, and always accumulative reduction ratio is 63%, and the accumulative rate that pushes of single pass is more than 20%；
Step 3, Equal-channel Angular Pressing：
Got on the bus from hot rolled plate and cut out bar of the size for 10 × 70mm of Φ, carried out 4 passage Equal-channel Angular Pressings, be made and squeeze
Pressure bar material；Wherein, the path of Equal-channel Angular Pressing uses path C modes, and extrusion temperature is 400 DEG C, extruding force 50MPa,
Extrusion speed is 5mm/min, and every time after extruding, next passage extruding is carried out after injection port bar rotates 180 °；
Step 4, two-step thermal processing：
By extruded barses, after being incubated 5min at 800 DEG C of two-phase section, the 400 DEG C of insulations of Bainite Region temperature are quenched to rapidly
3min, room temperature is finally air-cooled to, high strength and ductility TRIP Steel Bars are made.
High strength and ductility TRIP Steel Bars manufactured in the present embodiment, carry out tension test, the metallography microscope before its stretcher strain
Organize (OM) such as shown in Fig. 4 (d), X-ray diffraction result is as shown in curve 4 in Fig. 5, curve (4 in load-deformation curve such as Fig. 5
Passage ECAP deformation+TRIP techniques are heat-treated) shown in, the steel yield strength is 635MPa, tensile strength 739MPa, elongation percentage
For 39.8%, strength and ductility product 29.4GPa%.
Claims (7)
- A kind of 1. equal channel corner extrusion preparation method of high strength and ductility TRIP Steel Bars, it is characterised in that described high strength and ductility The weight/mass percentage composition of the chemical constituent of TRIP Steel Bars is：C：0.15~0.20%, Mn：1.30~1.50%, Si：0.50~ 0.70%, Al：0.50~0.60%, Nb：0.02~0.05%, S：<0.01%, P：<0.01%, surplus is for Fe and unavoidably Impurity；Preparation method comprises the following steps:Step 1, slab is prepared：After composition according to high strength and ductility TRIP Steel Bars is smelted and cast, slab is forged into；Step 2, hot rolling：(1) by slab, 2~3h is incubated at 1200~1250 DEG C；(2) by the slab after insulation, after carrying out multistage hot deformation immediately, room temperature is air-cooled to, hot rolled plate is made；Wherein, finish to gauge temperature Spend for 900~950 DEG C, always accumulative reduction ratio is 56~64%；Step 3, Equal-channel Angular Pressing:Got on the bus from hot rolled plate and cut out bar, carry out Equal-channel Angular Pressing, extruded rod is made Material；Wherein, the path of Equal-channel Angular Pressing uses path C modes, and extrusion temperature is 380~420 DEG C, and extruding force is 45~ 55MPa, extrusion speed are 4~6mm/min, if extruding passage is more than 1 time, after every time extruding, are revolved in injection port bar Next passage extruding is carried out after turning 180 °；Step 4, two-step thermal processing:By extruded barses, after being incubated at a temperature of two-phase section, Bainite Region insulation is quenched to rapidly, Room temperature is finally air-cooled to, high strength and ductility TRIP Steel Bars are made.
- 2. the equal channel corner extrusion preparation method of high strength and ductility TRIP Steel Bars according to claim 1, its feature exist In in described step 1, Forge Heating temperature is 1180~1220 DEG C, 1.5~2.5h of soaking time, and forging deformation temperature is 950~1100 DEG C, it is forged into the slab that thickness is 30~35mm.
- 3. the equal channel corner extrusion preparation method of high strength and ductility TRIP Steel Bars according to claim 1, its feature exist In, in described step 2 (2), 3~5 passage hot rollings of progress altogether；Single pass reduction ratio is 20~25%；Hot rolling plate thickness is 11 ~13mm.
- 4. the equal channel corner extrusion preparation method of high strength and ductility TRIP Steel Bars according to claim 1, its feature exist In, in described step 3, altogether carry out 1~4 passage Equal-channel Angular Pressing.
- 5. the equal channel corner extrusion preparation method of high strength and ductility TRIP Steel Bars according to claim 1, its feature exist In in described step 4, two-phase section temperature is 780~820 DEG C, and two-phase section is incubated 4~6min；Bainite Region temperature be 380~ 430 DEG C, Bainite Region is incubated 2~5min.
- 6. the equal channel corner extrusion preparation method of high strength and ductility TRIP Steel Bars according to claim 5, its feature exist In in described step 4, two-phase section insulation is carried out in the salt bath furnace of chlorate；Bainite Region is incubated the salt bath in nitrate Carried out in stove.
- 7. the equal channel corner extrusion preparation method of high strength and ductility TRIP Steel Bars according to claim 6, its feature exist In described nitrate is the mixture of natrium nitrosum and potassium nitrate.
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