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Method for rapidly promoting deformation to induce martensite transformation

A technology of martensitic transformation and deformation induction, applied in the field of metal material processing, can solve the problems of lower product quality and service life, low strength and hardness, yield deformation, etc.

Active Publication Date: 2015-12-23
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Austenitic stainless steel has become an important engineering material in modern industry due to its excellent corrosion resistance and formability. However, the strength and hardness of austenitic stainless steel are low, and its products are prone to scratches, wear or yield deformation and cause failure. , thereby reducing product quality and service life
[0003] For stainless steel, performance improvement is

Method used

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  • Method for rapidly promoting deformation to induce martensite transformation
  • Method for rapidly promoting deformation to induce martensite transformation
  • Method for rapidly promoting deformation to induce martensite transformation

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] Example 1

[0026] Milling commercial 304 stainless steel hot-rolled plates into 10*30*100 (mm) size, with smooth upper and lower surfaces. The plate was kept in vacuum at 1100°C for 1 hour, and then quickly water quenched after being discharged from the furnace. The quenched 304 stainless steel plate is subjected to room temperature cold rolling deformation, with a pass deformation of 10%, and each pass is separated by 15-20 minutes or continuous cold rolling to obtain 10%, 20%, 30%, 40%, 50%, respectively, 80% of the rolled plate. Use XRD diffraction pattern for phase analysis, use TEM for microstructure morphology analysis, the example pictures are respectively figure 1 with Figure 4 . figure 1 It is the X-ray diffraction pattern of 304 stainless steel after rolling at room temperature. It can be seen from the figure that the martensite diffraction peak intensity increases with the increase of the amount of deformation during the rolling process, and the austenite d...

Example Embodiment

[0027] Example 2

[0028] Commercial 304 stainless steel hot-rolled plate is used as the raw material for rolling, and the surface of the initial material is milled to make 10*30*100 (mm) plates to ensure that the upper and lower surfaces are smooth and clean. The plate was vacuum treated at 1100°C for 1 hour and then water quenched. The heat-treated stainless steel plate is immersed in liquid nitrogen for cooling for more than 2 hours, and then rolled with a deformation of 10% passes. The stainless steel plates are immersed in liquid nitrogen for cooling for 15-20 minutes between each pass, and the total deformation is 10%, 20%, 30%, 40%, 50%, and 80% respectively. Use XRD diffraction pattern for phase analysis, use TEM for microstructure analysis, the example pictures are respectively figure 2 , Figure 5 (a) and Figure 5 (b). Comparing the XRD diffraction pattern of Example 1, in Example 2, after 10% rolling deformation, all four diffraction peaks of martensite can appear...

Example Embodiment

[0030] Example 3

[0031] Commercial 304 stainless steel hot-rolled plate is used as the raw material for rolling, and the initial material is milled into 10*30*100 (mm) specifications to ensure smooth and clean upper and lower surfaces. The plates were vacuum treated at 1100°C for 1 hour and then water quenched, and the quenched plates were divided into two groups, A and B. The stainless steel plates of group A are immersed in liquid nitrogen to cool for more than 2 hours, and then rolled with 10% pass deformation, while the plates of group B are directly rolled and deformed at room temperature, and the plates of group A and B are respectively subjected to total The deformation amount is 20% and 40% rolling deformation. Among them, the plates of group A need to be immersed in liquid nitrogen to cool for 15-20 minutes between rolling passes, and plates of group B are directly cooled in air. Subsequently, the martensite phases of the surface layer, 1 / 4 thickness layer and 1 / 2 th...

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Abstract

The invention discloses a processing method for promoting efficient transformation of martensite in an alloy material with deformation-induced martensite transformation characteristics, and belongs to the field of metal material processing. The method sequentially includes the following steps: solid solution-quenching or annealing treatment, low temperature cooling treatment, rolling deformation and the like are carried out on an alloy panel, wherein low temperature pre-cooling treatment is carried out in a cooling medium at a temperature lower than -50 DEG C; and when a metastable austenitic stainless steel sheet is subjected to low-temperature cooling and rolling deformation, the martensite content close to that obtained at an indoor temperature high-rolling deformation quantity can be obtained under a lower rolling deformation quantity, for example, the martensite transformation quantity obtained through low-temperature cooling and 30% rolling deformation is equivalent to the transformation quantity obtained under indoor temperature 80% rolling deformation. By means of the method, martensite transformation can be rapidly promoted, alloy materials like the metastable austenitic stainless steel can obtain the higher martensite transformation quantity under the lower deformation quantity, and alloys are obviously hardened.

Description

technical field [0001] The invention discloses a method for rapid deformation-induced martensite transformation, which can realize rapid and nearly complete transformation from austenite to martensite, and rapidly improve the mechanical properties and processing deformation characteristics of original steel, belonging to the field of metal material processing . Background technique [0002] Austenitic stainless steel has become an important engineering material in modern industry due to its excellent corrosion resistance and formability. However, the strength and hardness of austenitic stainless steel are low, and its products are prone to scratches, wear or yield deformation and cause failure. , thereby reducing product quality and service life. [0003] For stainless steel, performance improvement is mainly achieved through processing strengthening and fine-grain strengthening, especially for steels that can undergo deformation-induced martensitic transformation, which ca...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/22
Inventor 侯陇刚史金涛崔华庄林忠张济山
Owner UNIV OF SCI & TECH BEIJING
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