Hot processing technique for restraining martensite phase transformation during austenitic stainless steel deformation

A technology of austenitic stainless steel and martensitic transformation, applied in the field of metal heat treatment, it can solve the problems of increased cracking tendency, decreased toughness, instability, etc., to reduce the degree of work hardening, reduce the cracking tendency, and reduce the driving force. Effect

Inactive Publication Date: 2016-06-08
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This austenite structure is unstable. During cold working, part of the austenite will transform into martensite, which will increase the strength of stainless steel and decrease the toughness, thereby increasing the tendency of cracking during forming.
During the processing and manufacturing of equipment, metastable austenitic stainless steel materials usually need to undergo cold working processes such as cold rolling, cold drawing, cold bending, leveling and straightening to deform the material and promote the occurrence of martensitic transformation. This has a great adverse effect on the corrosion resistance and formability of stainless steel

Method used

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  • Hot processing technique for restraining martensite phase transformation during austenitic stainless steel deformation
  • Hot processing technique for restraining martensite phase transformation during austenitic stainless steel deformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Cut the stainless steel plate into a sample of 25×200mm.

[0019] (2) Mark the original gauge length on the sample, and the original gauge length is 150mm.

[0020] (3) Put the sample into the heating furnace, turn on the power, start timing when the furnace temperature reaches 140°C, and keep warm for 10 minutes.

[0021] (4) Immediately after the heat preservation is over, the sample is stretched on a stretching machine until the original gauge length is stretched to 163.5mm (9% stretch).

[0022] (5) After the sample is cooled, grind the surface of the sample with 240#~1200# SiC sandpaper successively.

[0023] (6) Carry out martensite content measurement and hardness test.

Embodiment 2

[0025] (1) Cut the stainless steel plate into a sample of 25×200mm.

[0026] (2) Mark the original gauge length on the sample, and the original gauge length is 150mm.

[0027] (3) Put the sample into the heating furnace, turn on the power, start timing when the furnace temperature reaches 100°C, and keep warm for 10 minutes.

[0028] (4) Immediately after the heat preservation is over, the sample is stretched on a stretching machine until the original gauge length is stretched to 163.5mm (9% stretch).

[0029] (5) After the sample is cooled, grind the surface of the sample with 240#~1200# SiC sandpaper successively.

[0030] (6) Carry out martensite content measurement and hardness test.

Embodiment 3

[0032] (1) Cut the stainless steel plate into a sample of 25×200mm.

[0033] (2) Mark the original gauge length on the sample, and the original gauge length is 150mm.

[0034] (3) Put the sample into the heating furnace, turn on the power, start timing when the furnace temperature reaches 60°C, and keep warm for 10 minutes.

[0035] (4) Immediately after the heat preservation is over, the sample is stretched on a stretching machine until the original gauge length is stretched to 163.5mm (9% stretch).

[0036] (5) After the sample is cooled, grind the surface of the sample with 240#~1200# SiC sandpaper successively.

[0037] (6) Carry out martensite content measurement and hardness test.

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Abstract

The invention relates to a hot processing technique for restraining martensite phase transformation during austenitic stainless steel deformation. The hot processing technique comprises the steps that the surface of a stainless steel sample is cleaned so that oil dirt and impurities on the surface of the sample can be removed; the cleaned stainless steel sample is put into a heating furnace to be subjected to heat treatment modification; and after heat preservation is finished, stretching deformation is immediately conducted on the stainless steel sample subjected to heat treatment modification. The hot processing technique has the beneficial effects that heating treatment is conducted before deformation, and thus the driving force of the martensite phase transformation can be effectively decreased; the content of martensite in the austenitic stainless steel is obviously decreased after deformation, and the hardness is lowered accordingly, so that the processing hardening degree during stainless steel deformation is reduced, and the cracking tendency is reduced; and the corrosion resistance of products after formation can be effectively improved by decreasing the content of martensite.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and relates to a thermal processing technology for suppressing martensitic transformation during deformation of austenitic stainless steel. Background technique [0002] Heat treatment can effectively reduce the degree of work hardening of the material during molding and reduce the tendency of the material to crack during molding, so it is widely used. [0003] 304 austenitic stainless steel is a metastable austenitic stainless steel. According to the chemical composition and performance requirements of 304 austenitic steel, the heat treatment system is generally solution treatment, and the obtained structure is supersaturated austenitic body. This austenite structure is unstable. During cold working, part of the austenite will transform into martensite, which will increase the strength of stainless steel and decrease the toughness, thereby increasing the tendency of cracking during...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D8/00
CPCC21D6/004C21D8/005C21D2211/001C21D2211/008
Inventor 胡静朱守国林丹丹朱秋华
Owner CHANGZHOU UNIV
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