CN106755772A - A kind of non-carburized zone softening method of CSS 42L pinion steels - Google Patents

A kind of non-carburized zone softening method of CSS 42L pinion steels Download PDF

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Publication number
CN106755772A
CN106755772A CN201611097538.4A CN201611097538A CN106755772A CN 106755772 A CN106755772 A CN 106755772A CN 201611097538 A CN201611097538 A CN 201611097538A CN 106755772 A CN106755772 A CN 106755772A
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China
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carried out
css
carburized zone
temperature
treatment
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CN201611097538.4A
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CN106755772B (en
Inventor
孙振淋
辛玉武
周动林
刘慧�
郝博健
辛昕
金玉亮
曾西军
徐奉鑫
崔学威
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AVIC Harbin Dongan Engine Group Co Ltd
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AVIC Harbin Dongan Engine Group Co Ltd
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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
    • 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
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/04—Hardening by cooling below 0 degrees Celsius
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
    • 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
    • C21D2261/00—Machining or cutting being involved

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  • 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 Articles (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

The present invention relates to a kind of non-carburized zone softening method of CSS 42L pinion steels, after carburizing, sub- temperature annealing, quenching, in the matrix of non-carburized zone, high temperature austenite is completely transformed into overcooling austenite, and hardness only has HRC28~35, is easy to machine cut to process.The present invention is greatly reduced the non-carburized zone difficulty of processing of CSS 42L carburizing class parts by above-mentioned technique adjustment scheme, is easy to the essence of subsequent mechanical half, finishing.

Description

A kind of non-carburized zone softening method of CSS-42L pinion steels
Technical field
The present invention relates to a kind of non-carburized zone softening method, especially a kind of non-carburized zone of CSS-42L pinion steels is soft Change method.
Background technology
For the superelevation requirement that aviation heavy-duty drive system is proposed to gear temperature tolerance, the U.S. develops CSS-42L the 3rd For carbonized Gear Steel, a kind of distinguishing feature of the steel is exactly that, with good high temperature red hardness and high tempering drag, carburizing is quenched After fire, be on active service 500h at 427 DEG C, and diffusion layer organization hardness remains within more than HRC60, and anti-dry friction and wear ability is extremely excellent It is different.
, it is necessary to carry out half finishing to non-carburized zone after conventional gears carburizing, the annealing of sub- temperature, quenching, cold treatment, tempering Work, finishing, but CSS-42L pinion steels are after over carburizing, the annealing of sub- temperature, quenching, cold treatment, timeliness tempering, non-carburized zone Hardness be up to HRC45~55, greatly, cutter consume is serious, and production efficiency declines to a great extent for the essence of machinery half, finishing difficulty, this Kind of situation is solved to this having had not yet to see pertinent literature report.
The content of the invention
It is an object of the invention to provide a kind of non-carburized zone softening method of CSS-42L pinion steels, by adjusting its carburizing Technology for Heating Processing route afterwards, softens the non-carburized zone after CSS-42L pinion steel carburizing and quenchings, hardness be down to HRC28~ 35, it is easy to the essence of subsequent mechanical half, finishing.
The technique adjustment scheme taken is specific as follows：
1st, after the carburizing of CSS-42L pinion steels, sub- temperature annealing is not carried out, being placed directly within carries out high temperature austenite in vacuum oil quenching Change, 1050~1200 DEG C of austenitizing temperature, after 0.5~6h of insulation, carry out vacuum oil quenching, quenching oil bath temperature is 40~75 ℃；
2nd, 100~300 DEG C are carried out after oil quenching and eliminates stress treatment, elimination stress time is 1~10h；
3rd, after eliminating stress, machine cut processing is carried out to non-carburized zone；
4th, after non-carburized zone machine cut is machined, cold treatment is integrally carried out to part, cold place is carried out at -180~-70 DEG C Reason, process time is 2~10h；
5th, after cold treatment, part is gone into vacuum drying oven carries out Ageing Treatment, or controlled atmosphere generator is used after piece surface copper facing Ageing Treatment is carried out, aging temperature is 466~526 DEG C, and aging time is 1~8h.
Because CSS-42L material alloys content is more than 30wt.%, after part is annealed, quenched through carburizing, sub- temperature, non-carburizing In the matrix in region, high temperature austenite is completely transformed into overcooling austenite, and hardness only has HRC28~35, is easy to machinery to cut Cut processing.Although now the carburized zone of part is similarly the overcooling austenite tissue of soft, this overcooling austenite is more Stabilization.After non-carburized zone machine cut is machined, part carries out cold treatment, can be quenching horse by Cooling Austenite Transformation The matrix hardness of family name's body tissue, the diffusion layer organization of carburized zone and non-carburized zone is greatly improved, then by high-temperature aging Post-curing, carburized zone returns to original technique (carburizing, sub- temperature annealing, quenching, cold place with the hardness of non-carburized zone Reason, timeliness tempering) hardness number.The present invention makes the non-carburizing of CSS-42L carburizing class parts by above-mentioned technique adjustment scheme Region processing difficulty is greatly reduced, and is easy to the essence of subsequent mechanical half, finishing.
Specific embodiment
A kind of non-carburized zone softening method of CSS-42L pinion steels is comprised the following steps：
1st, after the carburizing of CSS-42L pinion steels, sub- temperature annealing is not carried out, being placed directly within carries out high temperature austenite in vacuum oil quenching Change, 1050~1200 DEG C of austenitizing temperature, after 0.5~6h of insulation, carry out vacuum oil quenching, quenching oil bath temperature is 40~75 ℃；
2nd, 100~300 DEG C are carried out after oil quenching and eliminates stress treatment, elimination stress time is 1~10h；
3rd, after eliminating stress, machine cut processing is carried out to non-carburized zone；
4th, after non-carburized zone machine cut is machined, cold treatment is integrally carried out to part, cold place is carried out at -180~-70 DEG C Reason, process time is 2~10h；
5th, after cold treatment, part is gone into vacuum drying oven carries out Ageing Treatment, or controlled atmosphere generator is used after piece surface copper facing Ageing Treatment is carried out, aging temperature is 466~526 DEG C, and aging time is 1~8h.
Embodiment
Certain aviation transmission system gear part, material is CSS-42L pinion steels, and after the part flank of tooth carries out carburizing, its is non- The hardness HRC51.8 of cemented zone.Subsequently need to carry out its non-carburized zone machine cut processing, therefore will be to non-carburized zone Softened, its specific step is：
1st, after part is through carburizing, sub- temperature annealing is not carried out, being placed directly within carries out influence of high austenizing temp, austenite in vacuum oil quenching Change 1100 DEG C of temperature, after insulation 2h, carry out vacuum oil quenching, quenching oil bath temperature is 55 DEG C；
2nd, 200 DEG C are carried out after oil quenching and eliminates stress treatment, elimination stress time is 4h；
3rd, after eliminating stress, machine cut processing is carried out to non-carburized zone；
4th, after non-carburized zone machine cut is machined, cold treatment is integrally carried out to part, cold treatment is carried out at -180 DEG C, located The reason time is 4h；
5th, after cold treatment, part is gone into vacuum drying oven carries out Ageing Treatment, and aging temperature is 496 DEG C, and aging time is 4h.
Process program is carried out by the above method to adjust and optimization, hardness of the non-carburized zone after carburizing, vacuum oil quenching It is HRC31.2, cutting ability is greatly improved；Meanwhile, cold treatment is carried out after processing, the hardness of non-carburized zone is returned to former work Skill index, meets design requirement.

Claims (1)

1. the non-carburized zone softening method of a kind of CSS-42L pinion steels, it is characterised in that described method is comprised the following steps：
1) after the carburizing of CSS-42L pinion steels, sub- temperature annealing is not carried out, being placed directly within carries out high temperature austenite in vacuum oil quenching Change, 1050~1200 DEG C of austenitizing temperature, after 0.5~6h of insulation, carry out vacuum oil quenching, quenching oil bath temperature is 40~75 ℃；
2) 100~300 DEG C are carried out after oil quenching and eliminates stress treatment, elimination stress time is 1~10h；
3) after eliminating stress, machine cut processing is carried out to non-carburized zone；
4) after non-carburized zone machine cut is machined, cold treatment is integrally carried out to part, cold place is carried out at -180~-70 DEG C Reason, process time is 2~10h；
5) after cold treatment, part is gone into vacuum drying oven carries out Ageing Treatment, or controlled atmosphere generator is used after piece surface copper facing Ageing Treatment is carried out, aging temperature is 466~526 DEG C, and aging time is 1~8h.
CN201611097538.4A 2016-12-02 2016-12-02 Softening method for non-carburized region of CSS-42L gear steel Active CN106755772B (en)

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CN201611097538.4A CN106755772B (en) 2016-12-02 2016-12-02 Softening method for non-carburized region of CSS-42L gear steel

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Application Number Priority Date Filing Date Title
CN201611097538.4A CN106755772B (en) 2016-12-02 2016-12-02 Softening method for non-carburized region of CSS-42L gear steel

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109182696A (en) * 2018-11-21 2019-01-11 中国航发哈尔滨东安发动机有限公司 A kind of three generations's carburizing Steel material nitrided surface method of modifying

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106086631A (en) * 2016-08-23 2016-11-09 钢铁研究总院 High-hardness, wearable height nitrogen martensite stainless bearing steel and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106086631A (en) * 2016-08-23 2016-11-09 钢铁研究总院 High-hardness, wearable height nitrogen martensite stainless bearing steel and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
朱民: "《四川省出版工作者协会高校出版社工作委员会系列丛书 金工实习》", 31 January 2012 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109182696A (en) * 2018-11-21 2019-01-11 中国航发哈尔滨东安发动机有限公司 A kind of three generations's carburizing Steel material nitrided surface method of modifying

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