CN111926152A - Heat treatment deformation control method for large 23Co14Ni12Cr3MoE steel part - Google Patents

Heat treatment deformation control method for large 23Co14Ni12Cr3MoE steel part Download PDF

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Publication number
CN111926152A
CN111926152A CN202010823109.0A CN202010823109A CN111926152A CN 111926152 A CN111926152 A CN 111926152A CN 202010823109 A CN202010823109 A CN 202010823109A CN 111926152 A CN111926152 A CN 111926152A
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China
Prior art keywords
tempering
temperature
heat treatment
air
quenching
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Pending
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CN202010823109.0A
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Chinese (zh)
Inventor
焦清洋
韩培培
康冲
赵博
李红恩
李志�
古立新
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Shenyang Aircraft Industry Group Co Ltd
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Shenyang Aircraft Industry Group Co Ltd
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Priority to CN202010823109.0A priority Critical patent/CN111926152A/en
Publication of CN111926152A publication Critical patent/CN111926152A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/007—Heat treatment of ferrous alloys containing Co
    • 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

Abstract

The invention discloses a method for controlling the deformation of a large 23Co14Ni12Cr3MoE steel part by heat treatment, which comprises the steps of stress relief tempering, air-cooled quenching, ice-cooled treatment, low-temperature tempering, correction, final tempering and the like.

Description

Heat treatment deformation control method for large 23Co14Ni12Cr3MoE steel part
Technical Field
The invention belongs to the technical field of heat treatment of ultrahigh-strength steel, and particularly relates to a heat treatment deformation control method for a large 23Co14Ni12Cr3MoE steel part.
Background
The 23Co14Ni12Cr3MoE steel is high-alloy ultrahigh-strength steel, has ultrahigh strength, good fracture toughness, higher fatigue strength, excellent stress corrosion fracture resistance and fatigue crack fracture resistance, and becomes a preferred material for manufacturing large-scale complex structural parts such as aircraft landing gears, bearing frame beams and the like in the aviation field by virtue of excellent obdurability matching. During the heat treatment process, the ultrahigh-strength steel complex structural parts inevitably deform under the action of thermal stress and structural stress. Especially for the rod and beam parts for the airplane with less allowance, uneven wall thickness and rapid change of section size, the deformation of the parts after heat treatment is inevitable.
As the tensile strength of the 23Co14Ni12Cr3MoE steel after heat treatment is about 1970MPa, the mechanical processing is difficult after the heat treatment, and the processing allowance is not suitable to be reserved excessively. Meanwhile, after heat treatment, the machining is easy to generate problems of vibration lines, burn and the like, and the fatigue performance of the part is greatly influenced. If the static pressure correction is carried out on the part after the heat treatment, the loading force is not well controlled, and the phenomenon that the part is broken and scrapped due to improper external force application is easily caused. Therefore, the deformation problem of the large-scale complex structure part made of 23Co14Ni12Cr3MoE steel after heat treatment is a technical bottleneck for restricting production.
At present, no effective heat treatment deformation control method for large complex components made of 23Co14Ni12Cr3MoE steel exists at home and abroad.
Disclosure of Invention
The invention aims to provide a method for controlling the heat treatment deformation of a large 23Co14Ni12Cr3MoE steel part, which aims to solve the problems in the prior art.
The technical scheme of the invention is as follows:
a method for controlling the deformation of a large 23Co14Ni12Cr3MoE steel part during heat treatment effectively controls the deformation of the part after heat treatment while ensuring the heat treatment performance of the part, and the dimensional precision of the part meets the design requirement. The invention adopts a vacuum gas-cooled quenching cooling process to replace the traditional oil-cooled quenching cooling process, adds a stress relief annealing process in the machining process of parts, adds a low-temperature tempering process system between the cold treatment and the final tempering process, and mainly comprises the following steps:
first, stress relief tempering
And (3) according to the structural form of the part, reasonably performing tempering for eliminating machining stress in the machining process of the part, wherein the tempering heating temperature is 417-427 ℃, the heat preservation time is 1-3 h, and air cooling.
Second, air quenching
Heating to 875-895 ℃ in a vacuum heat treatment furnace, quenching, heating and preserving heat for 90-135 min at 1 × 105Pa～4×105And carrying out air-cooled quenching in Pa high-purity argon.
Third, ice-cooling treatment
After quenching, the part is subjected to cold treatment within 8 hours, the temperature of the cold treatment is-65 ℃ to-81 ℃, the heat preservation time is 60min to 300min, and the part is cooled and then returned to the room temperature in the air.
Fourthly, low temperature tempering
And (3) tempering at low temperature after the part cold treatment process, wherein the tempering temperature is 180-200 ℃, the heat preservation time is not less than 3h, and cooling in the air.
The fifth step, correction
And (4) after the part is tempered at low temperature, performing static pressure correction by combining the deformation condition of heat treatment.
Sixth, final tempering
And (3) performing final tempering after the part is corrected, wherein the tempering heating temperature is 479-485 ℃, the tempering heat preservation time is 5-8 h, and the part is cooled in the air.
The invention has the advantages that:
1. the invention adopts vacuum gas-cooled quenching to replace oil-cooled quenching with relatively fast cooling speed, the hardness, tensile strength, yield strength, fracture toughness and the like of the parts after heat treatment meet the requirements of technical standards, the generation of quenching stress can be reduced, the parts basically have no deformation after heat treatment, and the dimensional accuracy meets the design requirements.
2. The invention reasonably adds the stress relief annealing procedure in the machining process of the part, changes the stress distribution in the part and can obviously reduce the quenching deformation.
3. The invention adds a low-temperature tempering process system between the cold treatment and the final tempering process, eliminates the time interval between the cold treatment and the final tempering, and solves the problem that the material performance is influenced by the correction period.
4. According to the invention, a correction procedure is added after cold treatment, and the 23Co14Ni12Cr3MoE material has a lower yield ratio between cold treatment and final tempering, so that the problem of difficult correction after final heat treatment of the ultrahigh-strength steel is solved.
Detailed Description
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. The following provides specific materials and sources thereof used in embodiments of the present invention. However, it should be understood that these are exemplary only and not intended to limit the invention, and that materials of the same or similar type, quality, nature or function as the following reagents and instruments may be used in the practice of the invention. The experimental procedures used in the following examples are all conventional procedures unless otherwise specified. Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Selecting large-scale complex parts made of 23Co14Ni12Cr3MoE steel, carrying out heat treatment by adopting the deformation control method, and carrying out performance assessment on the parts subjected to heat treatment, wherein the technical index requirement is tensile strength sigmabMore than or equal to 1930MPa and yield strength sigma0.2Not less than 1620MPa, hardness not less than 53HRC, elongation not less than 10%, reduction of area not less than 55%, fracture toughness
Figure BDA0002635023740000031
The main process flow is as follows:
firstly, stress relief tempering before quenching: and (3) tempering for eliminating machining stress in the machining process of the part, wherein the tempering heating temperature is 427 ℃, the heat preservation time is 2h, and air cooling is carried out.
Secondly, air-cooling quenching: heating to 885 deg.C in vacuum heat treatment furnace, quenchingThe heat preservation time is 135min, and is about 1.0 × 105And carrying out air-cooled quenching in Pa high-purity argon.
Step three, ice-cooling treatment: after quenching, the parts are subjected to cold treatment within 8 hours, the temperature of the cold treatment is-73 ℃, the heat preservation time is 300min, and the parts are cooled in the air and then are returned to the room temperature.
Fourthly, low-temperature tempering: and (3) tempering the part at low temperature after cold treatment, wherein the tempering temperature is 190 ℃, the heat preservation time is not less than 3h, and cooling in the air.
Fifthly, correcting: and (5) after the part is tempered at low temperature, correcting the part by combining the deformation condition of the heat treatment.
Sixth, final tempering: and (3) performing final tempering after the part is corrected, wherein the tempering heating temperature is 482 ℃, the tempering heat preservation time is 5.5h, and the part is cooled in air.
After the final heat treatment, the tensile strength sigma of the steel sheet is testedb1998MPa, yield strength sigma0.21825MPa, hardness 54HRC, elongation 14.5%, reduction of area 72%, and fracture toughness 117
Figure BDA0002635023740000041
The requirements of technical standards are met, the part is basically not deformed after heat treatment, and the dimensional precision of the part meets the design requirements.
The above description of exemplary embodiments has been presented only to illustrate the technical solution of the invention and is not intended to be exhaustive or to limit the invention to the precise form described. Obviously, many modifications and variations are possible in light of the above teaching to those skilled in the art. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to thereby enable others skilled in the art to understand, implement and utilize the invention in various exemplary embodiments and with various alternatives and modifications. It is intended that the scope of the invention be defined by the following claims and their equivalents.

Claims (1)

1. The method for controlling the deformation of the large 23Co14Ni12Cr3MoE steel part by heat treatment is characterized by comprising the following steps of:
first, stress relief tempering
According to the structural form of the part, tempering for eliminating machining stress is reasonably carried out in the machining process of the part, the tempering heating temperature is 417-427 ℃, the heat preservation time is 1-3 h, and the part is cooled in air;
second, air quenching
Heating to 875-895 ℃ in a vacuum heat treatment furnace, quenching, heating and preserving heat for 90-135 min at 1 × 105Pa～4×105Carrying out gas-cooled quenching in Pa high-purity argon;
third, ice-cooling treatment
After quenching, performing cold treatment within 8 hours at the temperature of-65 ℃ to-81 ℃, keeping the temperature for 60min to 300min, and then returning the temperature to the room temperature in the air;
fourthly, low temperature tempering
Tempering at low temperature of 180-200 ℃ after the part cold treatment process, keeping the temperature for not less than 3h, and cooling in air;
the fifth step, correction
After the part is tempered at low temperature, static pressure correction is carried out by combining the deformation condition of heat treatment;
sixth, final tempering
And (3) performing final tempering after the part is corrected, wherein the tempering heating temperature is 479-485 ℃, the tempering heat preservation time is 5-8 h, and the part is cooled in the air.
CN202010823109.0A 2020-08-17 2020-08-17 Heat treatment deformation control method for large 23Co14Ni12Cr3MoE steel part Pending CN111926152A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113444859A (en) * 2021-06-22 2021-09-28 北京航空航天大学 Double tempering treatment process method for 10Cr13Co13Mo5Ni3W1VE ultrahigh-strength stainless steel product

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103331651A (en) * 2012-12-17 2013-10-02 四川凌峰航空液压机械有限公司 Technology treatment method of machining deformation of long and thin hole shaft type thin-wall part
CN103343202A (en) * 2013-07-11 2013-10-09 太原理工大学 Quenching/subzero treatment method for heat treatment of low-temperature nickel steel
CN103981348A (en) * 2014-04-17 2014-08-13 中国航空工业集团公司沈阳飞机设计研究所 16Co14Ni10Cr2Mo steel large-part heat-treatment deformation control method
CN105671442A (en) * 2016-01-26 2016-06-15 安徽同盛环件股份有限公司 Bearing collar alloy steel and heat treatment process thereof
US20170349966A1 (en) * 2014-12-19 2017-12-07 Baoshan Iron & Steel Co., Ltd. Quenched-tempered high-strength steel with yield strength of 900 mpa to 1000 mpa grade, and manufacturing method therefor
CN110578109A (en) * 2019-10-08 2019-12-17 江西洪都航空工业集团有限责任公司 Vacuum carburizing heat treatment process for 18Cr2Ni4WA material workpiece

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103331651A (en) * 2012-12-17 2013-10-02 四川凌峰航空液压机械有限公司 Technology treatment method of machining deformation of long and thin hole shaft type thin-wall part
CN103343202A (en) * 2013-07-11 2013-10-09 太原理工大学 Quenching/subzero treatment method for heat treatment of low-temperature nickel steel
CN103981348A (en) * 2014-04-17 2014-08-13 中国航空工业集团公司沈阳飞机设计研究所 16Co14Ni10Cr2Mo steel large-part heat-treatment deformation control method
US20170349966A1 (en) * 2014-12-19 2017-12-07 Baoshan Iron & Steel Co., Ltd. Quenched-tempered high-strength steel with yield strength of 900 mpa to 1000 mpa grade, and manufacturing method therefor
CN105671442A (en) * 2016-01-26 2016-06-15 安徽同盛环件股份有限公司 Bearing collar alloy steel and heat treatment process thereof
CN110578109A (en) * 2019-10-08 2019-12-17 江西洪都航空工业集团有限责任公司 Vacuum carburizing heat treatment process for 18Cr2Ni4WA material workpiece

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113444859A (en) * 2021-06-22 2021-09-28 北京航空航天大学 Double tempering treatment process method for 10Cr13Co13Mo5Ni3W1VE ultrahigh-strength stainless steel product

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