Preparation method of high-strength and high-tenacity stainless steel

A high-strength, high-toughness, stainless steel technology, applied in the field of metal processing, can solve problems such as the inability to achieve industrialized production, and achieve the effects of simple shot peening and annealing processes, good economic benefits, and simple processes

Inactive Publication Date: 2017-12-22
SOUTH CHINA UNIV OF TECH
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  • Claims
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Problems solved by technology

[0017] The biggest shortcoming of the existing technology is that ECAP is only suitable for small-sized samples (generally a circular sample with a length of 45-50mm and a diameter of 10mm or a square sample with a side length of 10mm), and cannot realize industrial production

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  • Preparation method of high-strength and high-tenacity stainless steel
  • Preparation method of high-strength and high-tenacity stainless steel
  • Preparation method of high-strength and high-tenacity stainless steel

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Embodiment Construction

[0037] The present invention will be further described below in conjunction with accompanying drawing:

[0038] The present invention comprises the following steps:

[0039] (1) get thickness 1.5mm, size is 304 stainless steel plates of 50X50mm;

[0040] (2) Put the 50x50mm plate into a high-temperature electric furnace for solution treatment at 1050°C for 30 minutes, then rapidly cool to room temperature and then pickle for 30 minutes;

[0041] (3) Double-sided alternate shot peening method and 0.2MPa / 1min+0.5MPa / 8min composite shot peening process are adopted, the stainless steel shot peening diameter is 0.4mm, the distance from the nozzle to the sample surface is 80-100mm, and the spray angle is 90° ;

[0042] (4) Anneal the steel plate after shot peening at 700°C and 30min,

[0043] (5) The samples after shot blasting were washed with absolute ethanol and dried.

[0044] The pickling treatment in the step (2) specifically includes: soaking in stainless steel pickling p...

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Abstract

The invention discloses a preparation method of high-strength and high-toughness stainless steel. The invention adopts a compound process of shot peening surface nanometerization and annealing treatment. Firstly, a layer of nanocrystalline refinement layer is obtained on the surface of the stainless steel plate through shot peening surface nanotechnology, and then through appropriate annealing treatment, the nanocrystalline structure is transformed into a dual-scale structure, that is, ultrafine grains + micron-sized coarse grains Composed of two parts, using ultra-fine grains to improve the strength of stainless steel (fine-grain strengthening), and through the combined action of the micron-sized coarse-grained part in the surface layer and the original coarse-grained part that has not been refined in the shot peening process, to Continue to maintain the good plasticity of stainless steel. In order to obtain high-strength and high-toughness stainless steel plate.

Description

technical field [0001] The invention relates to the technical field of metal processing, in particular to a method for preparing high-strength and high-toughness stainless steel. Background technique [0002] At present, the austenitic stainless steel materials sold in the market all have excellent corrosion resistance and formability, and are widely used engineering materials. However, the strength and hardness of conventional coarse-grained austenitic stainless steel are low, which seriously affects the practical application of stainless steel. Therefore, it is very necessary to improve the strength and hardness of austenitic stainless steel, thereby improving product quality. Considering that austenitic stainless steel has a single-phase structure from high temperature to room temperature and does not undergo phase transformation, the strengthening methods for this type of material are very limited. Among them, nanometerization is an effective means of fine-grain streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D7/06C21D6/00
CPCC21D8/005C21D6/00C21D7/06
Inventor 郑志军王文熊高岩周驰宇
Owner SOUTH CHINA UNIV OF TECH
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