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A preparation method of high strength and high ductility 304 austenitic stainless steel with low martensite content

A technology of 304 stainless steel and austenitic stainless steel, which is used in the preparation of high-strength and high-plasticity 304 austenitic stainless steel, which can solve the problems of low processing efficiency, limited wide application, and harsh process technology.

Active Publication Date: 2021-09-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the current development of several surface deformation processes such as surface mechanical grinding and surface rolling treatment technology, it is necessary to use hard alloy cutter heads with special geometric dimensions to perform high-speed grinding or rolling treatment on the metal surface, and the process technology is harsh. low processing efficiency
More importantly, the surface of 304 austenitic stainless steel samples processed by this type of deformation technology still contains a high-density martensitic structure, which severely limits its wide application in industrial environments with magnetic fields

Method used

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  • A preparation method of high strength and high ductility 304 austenitic stainless steel with low martensite content
  • A preparation method of high strength and high ductility 304 austenitic stainless steel with low martensite content
  • A preparation method of high strength and high ductility 304 austenitic stainless steel with low martensite content

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Experimental program
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Effect test

Embodiment 1

[0033] In this embodiment, the coarse-grained 304 austenitic stainless steel bar is subjected to small-angle cyclic reciprocating torsional deformation treatment.

[0034] Fix one end of the coarse-grained 304 austenitic stainless steel sample, and apply cyclic torsional deformation to the other end (such as figure 1 Shown), the gradient structure 304#1 sample was obtained.

[0035] The process parameters of the gradient structure 304#1 sample are selected as follows: the diameter of 304 austenitic stainless steel is 6 mm, the torsion angle amplitude is 5 degrees, the torsion speed is 9000° / min, the torsion cycle is 200 cycles, and the torsion time is about 14 seconds. The temperature is room temperature 25 degrees.

[0036] As the depth from the surface increases, the degree of deformation in the material presents a monotonically decreasing trend, forming a gradient distribution of deformation microstructure ( figure 2 ). However, the microstructure is still austenite and...

Embodiment 2

[0039] In this embodiment, a cyclic torsional deformation treatment is applied to the coarse-grained 304 austenitic stainless steel #2 sample to obtain a 304 #2 sample with a gradient structure.

[0040] The difference from Example 1 is that the process parameters of the gradient structure 304#2 sample are selected as follows: the diameter of 304 austenitic stainless steel is 6 mm, the torsion angle amplitude is 15 degrees, the torsion speed is 9000 ° / min, and the torsion cycle is 200 cycles , the torsion time is about 6 minutes, and the torsion temperature is 25 degrees at room temperature.

[0041] As the depth from the surface increases, the degree of deformation in the material presents a monotonically decreasing trend, forming a gradient distribution of deformation microstructure ( figure 2 ). The outermost surface is still coarse-grained ( Figure 4 ), there are high-density dislocations distributed inside the coarse grain, a large number of dislocation cells and disl...

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Abstract

The invention discloses a preparation method of high-strength and high-plasticity 304 austenitic stainless steel with low martensite content, and belongs to the technical field of metal material strengthening. This method introduces a gradient dislocation and nano-twin deformation microstructure into the original coarse-grained structure of 304 stainless steel by subjecting coarse-grained 304 stainless steel rods or tubes to small-angle cyclic reciprocating torsional deformation. The content of martensite structure is less than 7%; the small-angle cyclic torsional deformation treatment refers to: fix one end of the rod or pipe, and apply force to make the other end of the rod or pipe reciprocate around its central axis, reciprocate Reverse the cycles one cycle at a time. Compared with the homogeneous coarse-grained structure of the same composition, the yield strength of the metal material after the cyclic torsion process is increased by more than 1.5 times, and it has uniform plasticity comparable to the coarse-grained structure.

Description

technical field [0001] The invention relates to the technical field of strengthening metal materials, in particular to a method for preparing high-strength and high-plasticity 304 austenitic stainless steel with low martensite content. Background technique [0002] 304 austenitic stainless steel, as the most widely used austenitic stainless steel, has the advantages of high toughness, plasticity, easy machinability and good corrosion resistance, and is widely used in aerospace, petrochemical, transportation, etc. All industrial fields. In recent years, with the development of society, resources are increasingly scarce, energy consumption and environmental pollution are intensifying, which forces metal components and equipment to continue to develop in the direction of high performance, light weight, energy saving and environmental protection, and the service environment is becoming more and more complex. However, the yield strength and hardness of austenitic 304 stainless s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D7/10
CPCC21D7/10C21D2211/001C21D2211/008
Inventor 卢磊潘庆松崔方
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI