JP2659353B2 - Manufacturing method of tough gray cast iron - Google Patents
Manufacturing method of tough gray cast ironInfo
- Publication number
- JP2659353B2 JP2659353B2 JP58160796A JP16079683A JP2659353B2 JP 2659353 B2 JP2659353 B2 JP 2659353B2 JP 58160796 A JP58160796 A JP 58160796A JP 16079683 A JP16079683 A JP 16079683A JP 2659353 B2 JP2659353 B2 JP 2659353B2
- Authority
- JP
- Japan
- Prior art keywords
- cast iron
- gray cast
- manufacturing
- transformation
- tough
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D5/00—Heat treatments of cast-iron
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
【発明の詳細な説明】 本発明は強靭ねずみ鋳鉄の製造法に係わり、特に鋳放
し状態で高強度、高靭性を有する強靭ねずみ鋳鉄の製造
法に関する。The present invention relates to a method for producing a tough gray cast iron, and more particularly to a method for producing a tough gray cast iron having high strength and high toughness in an as-cast condition.
ねずみ鋳鉄は基地中に片状黒鉛を有するため、鋳鉄の
中で最も大きな減衰能と熱導率を有するため、耐振動部
材あるいは快熱導性を要求される部材として、多用され
ている。しかし、ねずみ鋳鉄は他の鋳鉄と比べてその引
張強さと靭性は、大きく劣る。Gray cast iron has flaky graphite in the matrix, and therefore has the largest damping capacity and thermal conductivity among cast irons, and is therefore frequently used as a vibration-resistant member or a member requiring free heat conductivity. However, gray cast iron has significantly lower tensile strength and toughness than other cast irons.
ねずみ鋳鉄において、パーライト地のものでその抗張
力は高々30kg/mm2程度であり、さらに高い抗張力の材料
を得るには基地をベイナイト組織とする必要がある。強
靭ねずみ鋳鉄を鋳放しの状態でベイナイト化する方法は
Mo、Niなどの高価な特殊元素を多量に添加しなければな
らない。この方法は公知の事実であるが、きわめて不経
済である。In gray cast iron, its tensile strength at those perlite locations is at most 30kg / mm 2 approximately, it is necessary to obtain a higher tensile strength of the material is the base and bainite. How to turn bainite into as-cast tough gray cast iron
A large amount of expensive special elements such as Mo and Ni must be added. This method is a known fact, but very expensive.
本発明の目的は、Ni、Moなどの高価な元素を多量に添
加せずに、作業工程を短縮し且製造原価を低減し得る高
強度、高靭性の強靭ねずみ鋳鉄を製造する方法を提供す
るにある。An object of the present invention is to provide a method for producing a high-strength, high-toughness tough gray cast iron capable of shortening the working process and reducing the production cost without adding a large amount of expensive elements such as Ni and Mo. It is in.
本発明は、Mn:0.6重量％以下、Mo:0.4重量％以下を含
むねずみ鋳鉄組成を有する溶湯を鋳型に注湯し凝固させ
た後、鋳造品をA1変態域以上の所定の温度、望ましくは
800℃以上の温度で鋳型から取出し、急冷する強靭ねず
み鋳鉄の製造法であって、上記A1変態域以上の温度、望
ましくは800℃以上の温度からパーライト変態を生ぜし
めない冷却速度、望ましくは８℃／秒以上の冷却速度で
急冷し、ベイナイトとオーステナイトの混合組織を安定
的に生ぜしめる温度、望ましくは250℃から450℃に保持
し、所定時間、望ましくは0.5〜４時間経過後、放冷ま
たは急冷するものである。The present invention, Mn: 0.6 wt% or less, Mo: 0.4 After the molten metal having a gray cast iron composition comprising by weight percent was poured and solidified in the mold, the casting A 1 transformation zone or more predetermined temperature, preferably Is
Taken out from the mold at 800 ° C. or higher, a method of manufacturing a strong gray cast iron quenching, the A 1 transformation zone temperature above, preferably the cooling rate is not caused the pearlite transformation from a temperature above 800 ° C., preferably After quenching at a cooling rate of 8 ° C./sec or more, the temperature is maintained at a temperature at which a mixed structure of bainite and austenite is stably generated, preferably at 250 ° C. to 450 ° C., and after a lapse of a predetermined time, preferably 0.5 to 4 hours, Cool or quench.
以下本発明の実施例について詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail.
実施例 １ （２） テストピース φ40×300mm （３） 注入温度 1.400〜1.420℃ （４） 熱処理 （６） 組織、No.1は、第１図にその顕微鏡金属組織写
真（倍率:400倍）を示すように、基地はベイナイト組織
である。Example 1 (2) Test piece φ40 × 300mm (3) Injection temperature 1.400 ~ 1.420 ℃ (4) Heat treatment (6) Microstructure No. 1 has a bainite microstructure as shown in the microscopic metallographic photograph (magnification: 400 times) in FIG.
実施例 １ （２） テストピース φ40×300mm （３） 注入温度 1.400〜1.420℃ （４） 熱処理 （６） 組織、No.1は第２図にその顕微鏡金属組織写真
・・（倍率:400倍）を示すように、基地はベイナイト組
織である。Example 1 (2) Test piece φ40 × 300mm (3) Injection temperature 1.400 ~ 1.420 ℃ (4) Heat treatment (6) Microstructure No. 1 is a bainite structure as shown in FIG.
上述せる通り基地組織はベイナイト組織で、抗張力、
耐力、伸び、衝撃値などきわめて優れた機械的性質を有
する強靭ねずみ鋳鉄である。As mentioned above, the base structure is bainite structure, tensile strength,
It is a tough gray cast iron with extremely excellent mechanical properties such as proof stress, elongation and impact value.
以上の説明で明らかなように本発明による強靭ねずみ
鋳鉄の製造法は、Mn:0.6重量％以下、Mo:0.4重量％以下
を含む鋳造品をA1変態域以上の所定の温度、望ましくは
800℃以上の温度で鋳型から取出し、急冷する強靭ねず
み鋳鉄の製造法であって、上記A1変態域以上の温度、望
ましくは800℃以上の温度からパーライト変態を生ぜし
めない冷却速度、望ましくは８℃／秒以上の冷却速度で
急冷し、ベイナイトとオーステナイトの混合組織を安定
的に生ぜしめる温度、望ましくは250℃から450℃に保持
し、所定時間経過後、放冷または急冷するものである。The preparation of strong gray cast iron according to the present invention As is clear from the above description, Mn: 0.6 wt% or less, Mo: casting the A 1 transformation zone or more predetermined temperature containing 0.4 wt% or less, preferably
Taken out from the mold at 800 ° C. or higher, a method of manufacturing a strong gray cast iron quenching, the A 1 transformation zone temperature above, preferably the cooling rate is not caused the pearlite transformation from a temperature above 800 ° C., preferably It is quenched at a cooling rate of 8 ° C./sec or more, is maintained at a temperature at which a mixed structure of bainite and austenite is stably generated, desirably from 250 ° C. to 450 ° C., and is cooled or quenched after a predetermined time. .
従って、鋳造品の製作工程の短縮、再加熱の廃止によ
る製造原価の低減など経済性に優れ、しかも高強度、高
靭性など機械的性質のきわめて優れた強靭ねずみ鋳鉄を
安定して製造し得るものである。Therefore, it is economical, such as shortening the production process of castings and reducing manufacturing costs by eliminating reheating, and can stably produce tough gray cast iron with excellent mechanical properties such as high strength and high toughness. It is.
【図面の簡単な説明】 第１〜２図は共に顕微鏡金属組織写真である。BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are microscopic metallographic photographs.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−138812（ＪＰ，Ａ) 特公 平５−12411（ＪＰ，Ｂ２) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-138812 (JP, A) JP-B-5-12411 (JP, B2)
Claims (1)
むねずみ鋳鉄組成を有する溶湯を鋳型に注湯し、凝固さ
せた後鋳造品をA1変態域以上の所定の温度で鋳型から取
出し、急冷するねずみ鋳鉄の製造法において、上記A1変
態域以上である800℃以上の温度からパーライト変態を
生ぜしめない８℃／秒以上の冷却速度で急冷し、ベイナ
イトとオーステナイトの混合組織を安定的に生ぜしめる
250℃から450℃の温度に保持し、0.5〜４時間経過後、
放冷または急冷することを特徴とする強靭ねずみ鋳鉄の
製造法。1. A Mn: 0.6 wt% or less, Mo: molten metal having a gray cast iron composition containing 0.4 wt% or less and poured into a mold, casting after solidified product at the A 1 transformation zone or more predetermined temperature It is taken out from the mold, in the production method of gray cast iron quenching, quenched with 8 ° C. / sec or more cooling rate which does not give rise to pearlite transformation from the a 1 lower than the transformation range in which 800 ° C. or higher, mixing of bainite and austenite Generate stable tissue
Hold at a temperature of 250 ° C to 450 ° C, and after 0.5 to 4 hours,
A method for producing tough gray cast iron, which is cooled or quenched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58160796A JP2659353B2 (en) | 1983-09-01 | 1983-09-01 | Manufacturing method of tough gray cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58160796A JP2659353B2 (en) | 1983-09-01 | 1983-09-01 | Manufacturing method of tough gray cast iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6052514A JPS6052514A (en) | 1985-03-25 |
| JP2659353B2 true JP2659353B2 (en) | 1997-09-30 |
Family
ID=15722636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58160796A Expired - Lifetime JP2659353B2 (en) | 1983-09-01 | 1983-09-01 | Manufacturing method of tough gray cast iron |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2659353B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD252988A1 (en) * | 1986-10-02 | 1988-01-06 | Freiberg Bergakademie | PROCESS FOR ACCELERATED COOLING OF CASTORS |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4166756A (en) * | 1978-03-31 | 1979-09-04 | Standard Car Truck Co. | Railroad car friction casting metallurgy |
-
1983
- 1983-09-01 JP JP58160796A patent/JP2659353B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6052514A (en) | 1985-03-25 |
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