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A method for rapidly promoting deformation-induced martensitic transformation

A technology of martensitic transformation and deformation induction, applied in the field of metal material processing, can solve the problems of slow fine-grain strengthening efficiency, low strength and hardness, reduced product quality and service life, etc.

Active Publication Date: 2018-05-25
UNIV OF SCI & TECH BEIJING +1
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  • 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 mainly achieved through processing strengthening and fine-grain strengthening, especially for steels that can undergo deformation-induced martensitic transformation, which can achieve fine-grained steel through deformation-induced martensite, while traditional plastic deformation methods produce processing The efficiency of strengthening and deformation-induced phase transformation to fine-grain strengthening is too slow

Method used

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  • A method for rapidly promoting deformation-induced martensitic transformation
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  • A method for rapidly promoting deformation-induced martensitic transformation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The commercial 304 stainless steel hot-rolled plate is milled into a size of 10*30*100 (mm), and the upper and lower surfaces are smooth. The plate was kept in vacuum at 1100°C for 1 hour, and quickly quenched in water after being out of the furnace. The quenched 304 stainless steel plate is subjected to cold rolling deformation at room temperature, and the deformation amount of each pass is 10%, and the interval between each pass is 15-20 minutes or continuous cold rolling, respectively to obtain 10%, 20%, 30%, 40%, 50%, Rolled plate with 80% deformation. 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 rolled at room temperature. It can be seen from the figure that the intensity of the martensite diffraction peak increases with the increase of deformation during the rolling process, and th...

Embodiment 2

[0028] The commercial 304 stainless steel hot-rolled plate is used as the rolling raw material, and the initial material is surface milled to make a 10*30*100 (mm) plate to ensure smooth upper and lower surfaces. The plates were vacuum treated at 1100°C for 1 hour and then water quenched. The heat-treated stainless steel plate is immersed in liquid nitrogen to cool for more than 2 hours, and then rolled with 10% pass deformation. The stainless steel plates were immersed in liquid nitrogen for cooling for 15-20 minutes between each pass, and the total deformations were respectively obtained by 10%, 20%, 30%, 40%, 50%, and 80%. 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). The XRD diffraction spectrum of comparative example 1, just can make four diffraction peaks of martensite all appear ( figure 2 ), while embodiment 1 needs to reach 30% rolling deform...

Embodiment 3

[0031]The commercial 304 stainless steel hot-rolled plate is used as the rolling raw material, and the initial material is milled into 10*30*100 (mm) specifications to ensure smooth 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 were immersed in liquid nitrogen to cool for more than 2 hours, and then rolled with 10% pass deformation, while the plates of Group B were directly rolled and deformed at room temperature. The deformation amount is 20% and 40% rolling deformation. Among them, the plates of group A need to be immersed in liquid nitrogen for cooling for 15-20 minutes between rolling passes, and the plates of group B are directly cooled in the air. Subsequently, the martensitic phases of the surface layer, 1 / 4 thickness layer and 1 / 2 thickness layer of the A and B group plates were analyzed.

[0032] Table 1 shows ...

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Abstract

The invention discloses a treatment 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 includes the following steps in sequence: solid solution-quenching or annealing treatment, low-temperature cooling treatment, rolling deformation processing, etc. for the alloy plate, wherein the low-temperature pre-cooling treatment is carried out in a cooling medium at a temperature below -50°C. When the metastable austenitic stainless steel plate is subjected to low-temperature cooling and rolling deformation, a martensite content similar to that at room temperature and high rolling deformation can be obtained at a lower rolling deformation. For example, after low-temperature cooling and 30% rolling The transformation amount of martensite obtained after deformation is equivalent to the transformation amount obtained by 80% rolling deformation at room temperature. The method provided by the invention can rapidly promote martensite transformation, and can make alloy materials such as metastable austenitic stainless steel obtain higher martensite transformation amount under low deformation amount and make the alloy obtain obvious hardening.

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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Patent Type & Authority Patents(China)
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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