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A method of micro-deformation strengthening martensitic stainless steel

A martensitic stainless steel, micro-deformation technology, applied in the field of metal materials, to achieve the upper limit of high service strength, the improvement of low temperature yield strength, and the improvement of low temperature mechanical properties

Active Publication Date: 2020-08-11
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problem: The purpose of the present invention is to provide a method for micro-deformation strengthening of martensitic stainless steel. Through the present invention, the low-temperature mechanical properties of martensitic stainless steel can be further improved, and the stability of overload service in the actual low-temperature service environment can be solved. In addition, this strengthening method is easy to operate and the effect is obvious

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  • A method of micro-deformation strengthening martensitic stainless steel
  • A method of micro-deformation strengthening martensitic stainless steel
  • A method of micro-deformation strengthening martensitic stainless steel

Examples

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Effect test

Embodiment 1

[0028] A method for micro-deformation strengthening of martensitic stainless steel, the method comprising the following steps:

[0029] 1) Place the brand S04 martensitic stainless steel in a liquid nitrogen circulation environment at a temperature of -190°C, and keep it warm for 60 minutes to make it sufficiently low temperature;

[0030] 2) After the martensitic stainless steel samples are subjected to sufficient low temperature, perform a low temperature tensile test on some of the samples to obtain the low temperature tensile test data as parameters of the original mechanical properties before strengthening, and record the low temperature yield strength data of the material σ 0.2 ; Observe the initial microstructure of martensitic stainless steel by transmission electron microscope;

[0031] 3) Perform repeated stretching under a fixed high load on another part of the martensitic stainless steel sample after sufficiently low temperature, and obtain a micro-deformed and st...

Embodiment 2

[0038] A method for micro-deformation strengthening of martensitic stainless steel, the method comprising the following steps:

[0039] 1) Place the brand S08 martensitic stainless steel in a liquid nitrogen circulation environment with a temperature of -180°C, and keep it warm for 65 minutes to make it sufficiently low temperature;

[0040] 2) After the martensitic stainless steel samples are subjected to sufficient low temperature, perform a low temperature tensile test on some of the samples to obtain the low temperature tensile test data as parameters of the original mechanical properties before strengthening, and record the low temperature yield strength data of the material σ 0.2 ; Observe the initial microstructure of martensitic stainless steel by transmission electron microscope;

[0041] 3) Perform repeated stretching under a fixed high load on another part of the martensitic stainless steel sample after sufficiently low temperature, and obtain a micro-deformed and ...

Embodiment 3

[0048] A method for micro-deformation strengthening of martensitic stainless steel, the method comprising the following steps:

[0049] 1) Place the brand S04 martensitic stainless steel in a liquid nitrogen circulation environment with a temperature of -196°C, and keep it warm for 5 minutes to make it sufficiently low temperature;

[0050] 2) After the martensitic stainless steel samples are subjected to sufficient low temperature, perform a low temperature tensile test on some of the samples to obtain the low temperature tensile test data as parameters of the original mechanical properties before strengthening, and record the low temperature yield strength data of the material σ 0.2 ; Observe the initial microstructure of martensitic stainless steel by transmission electron microscope;

[0051] 3) Perform repeated stretching under a fixed high load on another part of the martensitic stainless steel sample after sufficiently low temperature, and obtain a micro-deformed and s...

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Abstract

The invention discloses a method for martensitic stainless steel after micro deformation strengthening. The method is characterized by using high-load loading for micro plastic deformation of the martensitic stainless steel to induce deformation twins, and comprises the following steps: 1) martensitic stainless steel samples are positioned in an ultralow-temperature environment for low-temperaturetreatment for full cooling; 2) after full cooling of the martensitic stainless steel samples, the low-temperature stretching test is performed on one part of the samples to obtain low-temperature stretching test data, and low-temperature yield strength data sigma 0.2 of the materials is recorded; and 3) the fixed high-load repeated stretching is performed on the other part of the martensitic stainless steel samples after full cooling for repeated stretching to obtain the martensitic stainless steel after micro deformation strengthening. The method improves the low-temperature yield strength of the martensitic stainless steel by above 10%, and meanwhile, is lower in influence on plasticity index.

Description

technical field [0001] The invention relates to a method for micro-deformation strengthening of martensitic stainless steel, which belongs to the field of metal materials. [0002] technical background [0003] Martensitic stainless steel is widely used in steam turbine blades, large engine block blades, bearings and wear-resistant parts, large castings used in the manufacture of hydropower station equipment, pump valve castings and other fields. Martensitic stainless steel is a traditional hardenable cast steel, its main feature is quite good hardenability, the current more common method is to strengthen through quenching, tempering and other heat treatment processes, so as to obtain higher hardness and strength and wear resistance. Martensitic precipitation hardening stainless steel is the use of pre-heat treatment such as quenching and tempering to cause precipitation hardening effect of martensitic stainless steel, and its yield strength is as high as 1000MPa or more. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/04C21D7/10
Inventor 廖恒成许何婷唐景凡赵宝军
Owner SOUTHEAST UNIV
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