CN102534132A - Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel - Google Patents
Quenching-partitioning thermal treatment method for high strength and toughness of medium carbon silicon-manganese low alloy steel Download PDFInfo
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- 229910000851 Alloy steel Inorganic materials 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000007669 thermal treatment Methods 0.000 title claims 6
- XTZVWOPRWVJODK-UHFFFAOYSA-N [Si].[Mn].[C] Chemical compound [Si].[Mn].[C] XTZVWOPRWVJODK-UHFFFAOYSA-N 0.000 title description 8
- 238000000638 solvent extraction Methods 0.000 title description 3
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 69
- 238000005192 partition Methods 0.000 claims abstract description 58
- 238000010438 heat treatment Methods 0.000 claims abstract description 43
- 229910000720 Silicomanganese Inorganic materials 0.000 claims abstract description 32
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 27
- 230000009466 transformation Effects 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 33
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 18
- 229910001566 austenite Inorganic materials 0.000 claims description 11
- 238000002791 soaking Methods 0.000 claims 4
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 abstract description 32
- 230000007797 corrosion Effects 0.000 abstract description 11
- 238000005260 corrosion Methods 0.000 abstract description 11
- 238000005279 austempering Methods 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 description 22
- 239000010959 steel Substances 0.000 description 22
- 230000035882 stress Effects 0.000 description 20
- 238000004321 preservation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 230000000717 retained effect Effects 0.000 description 5
- 238000005496 tempering Methods 0.000 description 4
- 229910000639 Spring steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
一种中碳硅锰低合金钢的高强韧淬火-配分热处理方法，涉及一种中碳硅锰低合金钢的高强韧淬火-配分热处理方法，是要解决现有中碳硅锰低合金钢虽然具有高强度，但是其塑韧性差、耐应力腐蚀性差的问题。方法：一、将中碳硅锰低合金钢奥氏体化处理，然后在中碳硅锰低合金钢的马氏体转变温度区间内进行等温淬火；二、将经步骤一处理后的中碳硅锰低合金钢在上马氏体点Ms至500℃的配分温度下等温配分热处理，再淬火至室温，即完成。经本发明方法处理后，中碳硅锰低合金钢的抗拉强度达到1650MPa～2115MPa，屈服强度达到1490MPa～1950MPa，延伸率为5％～10％，面缩率为20％～50％。
A high-strength quenching-partition heat treatment method for medium-carbon silicomanganese low-alloy steel relates to a high-strength quenching-partition heat treatment method for medium-carbon silicon-manganese low-alloy steel, which is to solve the problem of the existing medium-carbon silicon-manganese low-alloy steel. It has high strength, but its ductility is poor, and its stress corrosion resistance is poor. Method: 1. Austenitize the medium-carbon silicon-manganese low-alloy steel, and then perform austempering in the martensitic transformation temperature range of the medium-carbon silicon-manganese low-alloy steel; The silicon-manganese low alloy steel is subjected to isothermal partition heat treatment at the partition temperature from the upper martensitic point Ms to 500°C, and then quenched to room temperature to complete. After being treated by the method of the invention, the tensile strength of the medium-carbon silicon-manganese low-alloy steel reaches 1650MPa-2115MPa, the yield strength reaches 1490MPa-1950MPa, the elongation rate is 5%-10%, and the area shrinkage rate is 20%-50%.
Description
技术领域 technical field
本发明涉及一种中碳硅锰低合金钢的高强韧淬火-配分热处理方法。The invention relates to a high-strength and toughness quenching-partitioning heat treatment method for medium-carbon silicon-manganese low-alloy steel.
背景技术 Background technique
中碳硅锰低合金钢一般具有较高的强度和良好的弹性极限，主要应用于板簧、螺旋弹簧、安全阀簧及高应力下工作的主要弹簧等。该类合金钢的含碳量一般为0.50～0.70％，传统热处理制度为淬火+回火。通过淬火获得高强度的马氏体组织，并利用回火消除淬火后出现的热应力和组织应力，常规组织为回火屈氏体。传统的热处理制度虽然可以保证该类合金具有较高的弹性极限，能够满足普通使用环境的服役条件，但塑性、韧性欠佳或强韧性匹配不足、氢脆与应力腐蚀敏感性大等缺点，却限制了该类合金钢强韧性潜力的发挥。尤其是近年来汽车轻量化和高性能化的快速发展，迫切要求提高弹簧钢的设计应力。由于悬挂弹簧的质量与设计应力的平方成正比，在弹簧性能不变的前提下，随着设计应力的提高，弹簧可减重40％～50％，因此，开发一种工业上简便易行的热处理新工艺，在保证足够塑性的前提下，使中碳硅锰系弹簧钢设计应力提高20％～30％；另一方面，可以在保证高强度前提下，大幅度改善塑韧性、降低氢脆敏感性、提高应力腐蚀抗力，拓宽中碳硅锰钢在海洋性气候等严酷环境下重要结构件上的应用，具有广阔的应用前景和使用需求。Medium-carbon silicon-manganese low-alloy steel generally has high strength and good elastic limit, and is mainly used in leaf springs, coil springs, safety valve springs and main springs working under high stress. The carbon content of this type of alloy steel is generally 0.50-0.70%, and the traditional heat treatment system is quenching + tempering. The high-strength martensite structure is obtained by quenching, and the thermal stress and structural stress after quenching are eliminated by tempering. The conventional structure is tempered troostite. Although the traditional heat treatment system can ensure that this type of alloy has a high elastic limit and can meet the service conditions of ordinary service environments, it has disadvantages such as poor plasticity, toughness or insufficient matching of strength and toughness, and high sensitivity to hydrogen embrittlement and stress corrosion. This restricts the exertion of the strength and toughness potential of this type of alloy steel. Especially in recent years, with the rapid development of automobile lightweight and high performance, it is urgent to increase the design stress of spring steel. Since the quality of the suspension spring is proportional to the square of the design stress, under the premise that the spring performance remains unchanged, the spring can reduce its weight by 40% to 50% with the increase of the design stress. Therefore, it is easy to develop an industrially feasible The new heat treatment process can increase the design stress of medium-carbon silicomanganese spring steel by 20% to 30% on the premise of ensuring sufficient plasticity; on the other hand, it can greatly improve plasticity and toughness and reduce hydrogen embrittlement on the premise of ensuring high strength Sensitivity, improve stress corrosion resistance, and broaden the application of medium-carbon silicon-manganese steel in important structural parts in harsh environments such as marine climates, has broad application prospects and use requirements.
发明内容 Contents of the invention
本发明是要解决现有中碳硅锰低合金钢虽然具有高强度，但是其塑韧性差、耐应力腐蚀性差的问题，提供了一种中碳硅锰低合金钢的高强韧淬火-配分热处理方法。The present invention aims to solve the problems that the existing medium-carbon silicon-manganese low-alloy steel has high strength, but its ductility is poor and its stress corrosion resistance is poor. method.
本发明的中碳硅锰低合金钢的高强韧淬火-配分热处理方法是通过以下步骤实现的：一、将中碳硅锰低合金钢奥氏体化处理，然后在中碳硅锰低合金钢的马氏体转变温度区间内进行等温淬火，保温时间为60～120s；二、将经步骤一处理后的中碳硅锰低合金钢在上马氏体点Ms至500℃的配分温度下等温配分热处理30～1800s，然后再淬火至室温，即完成中碳硅锰低合金钢的高强韧淬火-配分热处理方法。The high-strength and tough quenching-partition heat treatment method of the medium-carbon silicon-manganese low-alloy steel of the present invention is realized through the following steps: one, the medium-carbon silicon-manganese low-alloy steel is austenitized, and then in the medium-carbon silicon-manganese low-alloy steel Austempering is carried out within the range of the martensitic transformation temperature, and the holding time is 60-120s; 2. The medium-carbon silicon-manganese low-alloy steel treated in step 1 is isothermal at the distribution temperature from the upper martensitic point M s to 500°C Partition heat treatment for 30-1800s, and then quenched to room temperature, that is, the high-strength quenching-partition heat treatment method for medium carbon silicomanganese low alloy steel is completed.
本发明步骤一中的中碳硅锰低合金钢奥氏体化处理中的奥氏体化温度为中碳硅锰低合金钢的AC3以上30℃～50℃，保温时间为600s～900s，其中AC3为加热时铁素体全部转变为奥氏体终了温度。The austenitization temperature of the medium-carbon silicon-manganese low-alloy steel in step 1 of the present invention is 30°C to 50°C above A C3 of the medium-carbon silicon-manganese low-alloy steel, and the holding time is 600s to 900s. Among them, A C3 is the temperature at which all ferrite transforms into austenite when heated.
步骤一中所述的中碳硅锰低合金钢中碳含量在0.25％～0.60％范围内。The carbon content in the medium-carbon silicon-manganese low-alloy steel described in the first step is in the range of 0.25% to 0.60%.
步骤一中所述中碳硅锰低合金钢包括并不仅限于60Si2MnA、55Si2Mn、55Si2MnB、55SiMnMoV、55SiMnVB等其它含硅锰中碳低合金钢。The medium-carbon silicon-manganese low-alloy steel mentioned in step 1 includes but not limited to 60Si2MnA, 55Si2Mn, 55Si2MnB, 55SiMnMoV, 55SiMnVB and other silicon-manganese-containing medium-carbon low-alloy steels.
本发明的中碳硅锰低合金钢的高强韧淬火-配分热处理方法中首先将中碳硅锰低合金钢经奥氏体化后，淬火到马氏体转变温度区间(Ms～Mf)的某一温度(Quenching Temperature，简称QT)进行不完全淬火或等温淬火，得到部分马氏体和残余奥氏体，随后在Ms～500℃之间等温配分热处理以改变淬火马氏体和残余奥氏体中碳分布，获得由低碳马氏体和残余奥氏体及其转变组织构成的复相组织，从而使得处理后的中碳硅锰低合金钢呈现高强度和高塑性的良好配合，并提高了应力腐蚀抗力、降低氢脆敏感性，并可以在较大范围内调整高强度与高塑性的配合。In the high-strength and toughness quenching-partition heat treatment method of the medium-carbon silicon-manganese low-alloy steel of the present invention, the medium-carbon silicon-manganese low-alloy steel is first austenitized, and then quenched to the martensite transformation temperature range (M s ~ M f ) Incomplete quenching or austempering at a certain temperature (Quenching Temperature, referred to as QT) to obtain part of martensite and retained austenite, followed by isothermal partition heat treatment between M s and 500°C to change the quenched martensite and retained austenite The distribution of carbon in the austenite obtains a multi-phase structure composed of low-carbon martensite and retained austenite and its transformation structure, so that the treated medium-carbon silicon-manganese low alloy steel presents a good combination of high strength and high plasticity , and improve the stress corrosion resistance, reduce the susceptibility to hydrogen embrittlement, and can adjust the coordination of high strength and high plasticity in a wide range.
经本发明的中碳硅锰低合金钢的高强韧淬火-配分热处理方法处理后，中碳硅锰低合金钢的抗拉强度达到1650MPa～2115MPa，屈服强度达到1490MPa～1950MPa，延伸率为5％～10％，面缩率为20％～50％，应力腐蚀临界应力强度因子KISCC达35～40MPa·m1/2。获得了符合实际服役条件的不同超高强度与优良塑韧性相配合的综合力学性能指标要求，并显著改善氢脆与应力腐蚀敏感性。After being treated by the high-strength quenching-partition heat treatment method of the medium-carbon silicomanganese low-alloy steel of the present invention, the tensile strength of the medium-carbon silicon-manganese low-alloy steel reaches 1650MPa-2115MPa, the yield strength reaches 1490MPa-1950MPa, and the elongation is 5% ～10%, area reduction rate 20%～50%, stress corrosion critical stress intensity factor K ISCC up to 35～40MPa·m 1/2 . The comprehensive mechanical performance index requirements of different ultra-high strength and excellent ductility and toughness that meet the actual service conditions have been obtained, and the hydrogen embrittlement and stress corrosion susceptibility have been significantly improved.
附图说明 Description of drawings
图1是具体实施方式十二经步骤一220℃等温淬火获得的马氏体组织照片；图2为具体实施方式十五经过等温淬火和等温配分热处理获得的马氏体和奥氏体组织照片，图中RA为残余奥氏体，BM为板条马氏体，LM为孪晶马氏体。Fig. 1 is a photograph of the martensite structure obtained by austempering at 220°C in step one of Embodiment 12; Fig. 2 is a photograph of martensite and austenite structure obtained by austempering and isothermal partition heat treatment in Embodiment 15, In the figure, RA is retained austenite, BM is lath martensite, and LM is twinned martensite.
具体实施方式 Detailed ways
本发明技术方案不局限于以下所列举具体实施方式，还包括各具体实施方式间的任意组合。The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.
具体实施方式一：本实施方式中碳硅锰低合金钢的高强韧淬火-配分热处理方法是通过以下步骤实现的：一、将中碳硅锰低合金钢奥氏体化处理，然后在中碳硅锰低合金钢的马氏体转变温度区间内进行等温淬火，保温时间为60～120s；二、将经步骤一处理后的中碳硅锰低合金钢在上马氏体点Ms至500℃的配分温度下等温配分热处理30～1800s，然后再淬火至室温，即完成中碳硅锰低合金钢的高强韧淬火-配分热处理方法。Specific embodiment one: the high-strength toughness quenching-partition heat treatment method of the carbon silicon manganese low alloy steel in the present embodiment is realized through the following steps: one, the medium carbon silicon manganese low alloy steel is austenitized, and then in the medium carbon Austempering is carried out in the martensitic transformation temperature range of silicon-manganese low-alloy steel, and the holding time is 60-120s; 2. The medium-carbon silicon-manganese low-alloy steel treated in step 1 is at the upper martensitic point M s to 500°C Isothermal partition heat treatment at the partition temperature for 30-1800s, and then quenched to room temperature, that is, the high-strength quenching-partition heat treatment method for medium-carbon silicon-manganese low-alloy steel is completed.
步骤一中的中碳硅锰低合金钢的马氏体转变温度区间(Ms～Mf)对于某一特定的中碳硅锰低合金钢Ms和Mf值是固定的。The martensitic transformation temperature range (M s -M f ) of the medium-carbon silicon-manganese low-alloy steel in step one is fixed for a certain medium-carbon silicon-manganese low-alloy steel M s and M f values.
经本实施方式的中碳硅锰低合金钢的高强韧淬火-配分热处理方法处理后，中碳硅锰低合金钢的抗拉强度达到1650MPa～2115MPa，屈服强度达到1490MPa～1950MPa，延伸率为5％～10％，面缩率为20％～50％，应力腐蚀临界应力强度因子KISCC达35～40MPa·m1/2。获得了符合实际服役条件的不同超高强度与优良塑韧性相配合的综合力学性能指标要求，并显著改善氢脆与应力腐蚀敏感性。After being treated by the high-strength quenching-partition heat treatment method of medium-carbon silicon-manganese low-alloy steel in this embodiment, the tensile strength of medium-carbon silicon-manganese low-alloy steel reaches 1650MPa-2115MPa, the yield strength reaches 1490MPa-1950MPa, and the elongation is 5 %~10%, area reduction rate 20%~50%, stress corrosion critical stress intensity factor K ISCC up to 35~40MPa·m 1/2 . The comprehensive mechanical performance index requirements of different ultra-high strength and excellent ductility and toughness that meet the actual service conditions have been obtained, and the hydrogen embrittlement and stress corrosion susceptibility have been significantly improved.
具体实施方式二：本实施方式与具体实施方式一不同的是：步骤一中的中碳硅锰低合金钢奥氏体化处理中的奥氏体化温度为中碳硅锰低合金钢的AC3以上30℃～50℃，保温时间为600s～900s，其中AC3为加热时铁素体全部转变为奥氏体终了温度。其它与具体实施方式一相同。Specific embodiment two: the difference between this embodiment and specific embodiment one is: the austenitization temperature in the austenitizing treatment of the medium-carbon silico-manganese low-alloy steel in step 1 is A of the medium-carbon silico-manganese low-alloy steel The temperature above C3 is 30℃～50℃, and the holding time is 600s～900s, where A and C3 are the final temperature when all ferrite transforms into austenite during heating. Others are the same as in the first embodiment.
具体实施方式三：本实施方式与具体实施方式一或二不同的是：步骤一中所述的中碳硅锰低合金钢中碳含量在0.25％～0.60％范围内。其它与具体实施方式一或二相同。Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the carbon content in the medium-carbon silicomanganese low-alloy steel described in step 1 is in the range of 0.25% to 0.60%. Others are the same as in the first or second embodiment.
具体实施方式四：本实施方式与具体实施方式一至三之一不同的是：步骤一中所述中碳硅锰低合金钢包括并不仅限于60Si2MnA、55Si2Mn、55Si2MnB、55SiMnMoV、55SiMnVB等其它含硅锰中碳低合金钢。其它与具体实施方式一至三之一相同。Embodiment 4: The difference between this embodiment and Embodiment 1 to 3 is that the medium-carbon silicon-manganese low-alloy steel described in step 1 includes but is not limited to 60Si2MnA, 55Si2Mn, 55Si2MnB, 55SiMnMoV, 55SiMnVB and other silicon-manganese-containing steels. Medium carbon low alloy steel. Others are the same as those in the first to third specific embodiments.
具体实施方式五：本实施方式与具体实施方式一至四之一不同的是：步骤一中保温时间为80～100s。其它与具体实施方式一至四之一相同。Embodiment 5: This embodiment is different from Embodiment 1 to Embodiment 4 in that: the heat preservation time in step 1 is 80-100 s. Others are the same as one of the specific embodiments 1 to 4.
具体实施方式六：本实施方式与具体实施方式一至四之一不同的是：步骤一中保温时间为90s。其它与具体实施方式一至四之一相同。Embodiment 6: This embodiment is different from one of Embodiments 1 to 4 in that: the heat preservation time in step 1 is 90s. Others are the same as one of the specific embodiments 1 to 4.
具体实施方式七：本实施方式与具体实施方式一至六之一不同的是：步骤二中等温配分热处理100～1600s。其它与具体实施方式一至六之一相同。Embodiment 7: This embodiment is different from Embodiment 1 to Embodiment 6 in that: in step 2, the isothermal partition heat treatment is performed for 100-1600 s. Others are the same as one of the specific embodiments 1 to 6.
具体实施方式八：本实施方式与具体实施方式一至六之一不同的是：步骤二中等温配分热处理300～1400s。其它与具体实施方式一至六之一相同。Embodiment 8: This embodiment differs from Embodiments 1 to 6 in that: in step 2, the isothermal partition heat treatment is carried out for 300-1400 s. Others are the same as one of the specific embodiments 1 to 6.
具体实施方式九：本实施方式与具体实施方式一至六之一不同的是：步骤二中等温配分热处理600～1200s。其它与具体实施方式一至六之一相同。Embodiment 9: This embodiment differs from Embodiments 1 to 6 in that: in step 2, the isothermal partition heat treatment is carried out for 600-1200 s. Others are the same as one of the specific embodiments 1 to 6.
具体实施方式十：本实施方式与具体实施方式一至六之一不同的是：步骤二中等温配分热处理800～1000s。其它与具体实施方式一至六之一相同。Embodiment 10: This embodiment is different from Embodiment 1 to Embodiment 6 in that: in step 2, the isothermal partition heat treatment is carried out for 800-1000 s. Others are the same as one of the specific embodiments 1 to 6.
具体实施方式十一：本实施方式中碳硅锰低合金钢的高强韧淬火-配分热处理方法是通过以下步骤实现的：一、将60Si2Mn钢奥氏体化处理，奥氏体化温度为870℃，保温600s，然后在60Si2Mn钢的马氏体转变温度区间内进行等温淬火，淬火温度为140℃，保温时间为120s；二、将经步骤一处理后的60Si2Mn钢在370℃的配分温度下等温配分热处理1200s，然后再淬火至室温，即完成中碳硅锰低合金钢的高强韧淬火-配分热处理方法。Embodiment 11: In this embodiment, the high-strength and toughness quenching-partition heat treatment method of carbon-silicon-manganese low-alloy steel is realized through the following steps: 1. Austenitizing treatment of 60Si2Mn steel, the austenitizing temperature is 870°C , heat preservation for 600s, and then carry out isothermal quenching in the martensitic transformation temperature range of 60Si2Mn steel, the quenching temperature is 140°C, and the holding time is 120s; 2. The 60Si2Mn steel treated in step 1 is isothermal at the partition temperature of 370°C Partition heat treatment for 1200s, and then quenched to room temperature, that is, the high-strength quenching-partition heat treatment method for medium carbon silicomanganese low alloy steel is completed.
本实施方式60Si2Mn钢经过该工艺热处理在保持适当塑性前提下达到超高强度指标：抗拉强度2115MPa，屈服强度1490MPa，延伸率5％，面缩率20％。The 60Si2Mn steel in this embodiment is heat-treated by this process to achieve ultra-high strength indicators under the premise of maintaining proper plasticity: the tensile strength is 2115MPa, the yield strength is 1490MPa, the elongation is 5%, and the area reduction is 20%.
具体实施方式十二：本实施方式中碳硅锰低合金钢的高强韧淬火-配分热处理方法是通过以下步骤实现的：一、将60Si2Mn钢奥氏体化处理，奥氏体化温度为870℃，保温600s，然后在60Si2Mn钢的马氏体转变温度区间内进行等温淬火，淬火温度为220℃，保温时间为60s；二、将经步骤一处理后的60Si2Mn钢在430℃的配分温度下等温配分热处理300s，然后再淬火至室温，即完成中碳硅锰低合金钢的高强韧淬火-配分热处理方法。Embodiment 12: In this embodiment, the high-strength and toughness quenching-partition heat treatment method of carbon-silicon-manganese low-alloy steel is realized through the following steps: 1. Austenitizing treatment of 60Si2Mn steel, the austenitizing temperature is 870°C , heat preservation for 600s, and then carry out isothermal quenching in the martensitic transformation temperature range of 60Si2Mn steel, the quenching temperature is 220°C, and the holding time is 60s; 2. The 60Si2Mn steel treated in step 1 is isothermal at the partition temperature of 430°C Partition heat treatment for 300s, and then quenched to room temperature, that is, the high-strength quenching-partition heat treatment method for medium carbon silicomanganese low alloy steel is completed.
本实施方式经步骤一220℃等温淬火获得的马氏体组织照片如图1所示。The photo of the martensite microstructure obtained by the first step of 220° C. austempering in this embodiment is shown in FIG. 1 .
本实施方式60Si2Mn钢经过该工艺热处理在保持超高强度水平下显著改善塑性指标：抗拉强度1650MPa，屈服强度1540MPa，延伸率10％，面缩率50％。In this embodiment, the 60Si2Mn steel in this embodiment undergoes heat treatment through this process to significantly improve the plasticity index while maintaining the ultra-high strength level: the tensile strength is 1650MPa, the yield strength is 1540MPa, the elongation is 10%, and the area reduction is 50%.
具体实施方式十三：本实施方式中碳硅锰低合金钢的高强韧淬火-配分热处理方法是通过以下步骤实现的：一、将60Si2Mn钢奥氏体化处理，奥氏体化温度为870℃，保温600s，然后在60Si2Mn钢的马氏体转变温度区间内进行等温淬火，淬火温度为180℃，保温时间为60s；二、将经步骤一处理后的60Si2Mn钢在410℃的配分温度下等温配分热处理600s，然后再淬火至室温，即完成中碳硅锰低合金钢的高强韧淬火-配分热处理方法。Specific Embodiment Thirteen: In this embodiment, the high-strength and toughness quenching-partitioning heat treatment method of carbon-silicon-manganese low-alloy steel is realized through the following steps: 1. Austenitizing treatment of 60Si2Mn steel, the austenitizing temperature is 870°C , keep warm for 600s, and then carry out isothermal quenching in the martensitic transition temperature range of 60Si2Mn steel, the quenching temperature is 180°C, and the holding time is 60s; 2. The 60Si2Mn steel treated in step 1 is isothermal at the partition temperature of 410°C Partition heat treatment for 600s, and then quenched to room temperature, that is, the high-strength and toughness quenching-partition heat treatment method of medium carbon silicomanganese low alloy steel is completed.
本实施方式60Si2Mn钢经过该工艺热处理达到高强塑积、优良强韧性配合的综合力学性能指标：抗拉强度2025MPa，屈服强度1950MPa，延伸率10％，面缩率40％。The 60Si2Mn steel in this embodiment is heat-treated by this process to achieve the comprehensive mechanical performance indicators of high strength plasticity, excellent strength and toughness: tensile strength 2025MPa, yield strength 1950MPa, elongation 10%, and area reduction 40%.
具体实施方式十四：本实施方式中碳硅锰低合金钢的高强韧淬火-配分热处理方法是通过以下步骤实现的：一、将60Si2Mn钢奥氏体化处理，奥氏体化温度为870℃，保温600s，然后在60Si2Mn钢的马氏体转变温度区间内进行等温淬火，淬火温度为220℃，保温时间为60s；二、将经步骤一处理后的60Si2Mn钢在390℃的配分温度下等温配分热处理1200s，然后再淬火至室温，即完成中碳硅锰低合金钢的高强韧淬火-配分热处理方法。Embodiment 14: In this embodiment, the high-strength and toughness quenching-partition heat treatment method of carbon-silicon-manganese low-alloy steel is realized through the following steps: 1. Austenitizing treatment of 60Si2Mn steel, the austenitizing temperature is 870°C , heat preservation for 600s, and then carry out isothermal quenching in the martensitic transformation temperature range of 60Si2Mn steel, the quenching temperature is 220°C, and the holding time is 60s; 2. The 60Si2Mn steel treated in step 1 is isothermal at the partition temperature of 390°C Partition heat treatment for 1200s, and then quenched to room temperature, that is, the high-strength quenching-partition heat treatment method for medium carbon silicomanganese low alloy steel is completed.
本实施方式60Si2Mn钢应力腐蚀临界应力强度因子KISCC达到35MPa·m1/2，比淬火+480℃回火1800s的传统热处理工艺提高20％。其力学性能指标为：抗拉强度1938MPa，屈服强度1899MPa，伸长率10％，面缩率18％。In this embodiment, the stress corrosion critical stress intensity factor K ISCC of the 60Si2Mn steel reaches 35MPa·m 1/2 , which is 20% higher than the traditional heat treatment process of quenching+480°C and tempering for 1800s. Its mechanical property indexes are: tensile strength 1938MPa, yield strength 1899MPa, elongation 10%, area shrinkage 18%.
具体实施方式十五：本实施方式中碳硅锰低合金钢的高强韧淬火-配分热处理方法是通过以下步骤实现的：一、将60Si2Mn钢奥氏体化处理，奥氏体化温度为870℃，保温600s，然后在60Si2Mn钢的马氏体转变温度区间内进行等温淬火，淬火温度为180℃，保温时间为60s；二、将经步骤一处理后的60Si2Mn钢在390℃的配分温度下等温配分热处理300s，然后再淬火至室温，即完成中碳硅锰低合金钢的高强韧淬火-配分热处理方法。Embodiment 15: In this embodiment, the high-strength and toughness quenching-partition heat treatment method of carbon-silicon-manganese low-alloy steel is realized through the following steps: 1. Austenitizing treatment of 60Si2Mn steel, the austenitizing temperature is 870°C , heat preservation for 600s, and then carry out isothermal quenching in the martensitic transformation temperature range of 60Si2Mn steel, the quenching temperature is 180°C, and the holding time is 60s; 2. The 60Si2Mn steel treated in step 1 is isothermal at the partition temperature of 390°C Partition heat treatment for 300s, and then quenched to room temperature, that is, the high-strength quenching-partition heat treatment method for medium carbon silicomanganese low alloy steel is completed.
本实施方式经过等温淬火和等温配分热处理获得的马氏体和奥氏体组织照片如图2所示，图中RA为残余奥氏体，BM为板条马氏体，LM为孪晶马氏体。The photo of martensite and austenite obtained through austempering and isothermal partition heat treatment in this embodiment is shown in Figure 2, in which RA is retained austenite, BM is lath martensite, and LM is twinned martensite body.
本实施方式60Si2Mn钢应力腐蚀临界应力强度因子KISCC达到40MPa·m1/2，比淬火+480℃回火1800s的传统热处理工艺提高35％。其力学性能指标为：抗拉强度2025MPa，屈服强度1947MPa，伸长率9％，面缩率42％。In this embodiment, the stress corrosion critical stress intensity factor K ISCC of 60Si2Mn steel reaches 40MPa·m 1/2 , which is 35% higher than the traditional heat treatment process of quenching+480°C and tempering for 1800s. Its mechanical performance index is: tensile strength 2025MPa, yield strength 1947MPa, elongation 9%, shrinkage 42%.
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