A kind of powder metallurgy austenitic stainless steel and preparation method thereof

A technology of austenitic stainless steel and powder metallurgy, applied in the field of powder metallurgy materials, can solve the problems of limited application, poor mechanical properties, wear resistance and corrosion resistance, etc.

Active Publication Date: 2021-01-26
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large number of tiny pores inside the powder metallurgy stainless steel, its mechanical properties, wear resistance and corrosion resistance are not as good as the dense stainless steel of the traditional process, which limits its application in some special requirements.

Method used

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  • A kind of powder metallurgy austenitic stainless steel and preparation method thereof
  • A kind of powder metallurgy austenitic stainless steel and preparation method thereof
  • A kind of powder metallurgy austenitic stainless steel and preparation method thereof

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preparation example Construction

[0025] The invention provides a method for preparing powder metallurgy austenitic stainless steel, comprising the following steps:

[0026] (1) mixing austenitic stainless steel powder, yttrium oxide powder and lubricant to obtain a mixed powder; the quality of the yttrium oxide powder is 0.2% to 0.4% of the total mass of the austenitic stainless steel powder and yttrium oxide powder;

[0027] (2) Compressing the mixed powder obtained in the step (1) to obtain a green body;

[0028] (3) Sintering the green body obtained in the step (2) to obtain powder metallurgy austenitic stainless steel.

[0029] The invention mixes austenitic stainless steel powder, yttrium oxide powder and lubricant to obtain mixed powder. In the present invention, the mass of the yttrium oxide powder is 0.2-0.4% of the mass of the mixed powder, preferably 0.3%. In the present invention, the yttrium oxide powder is used as a stabilizer, which can reduce precipitated phases under high temperature conditi...

Embodiment 1

[0044] Using 99.3wt% of 400-mesh 316L stainless steel powder, 0.2wt% of 400-mesh yttrium oxide powder and 0.5% of zinc stearate as raw materials, a horizontal ball mill is used for dry grinding and mixing. The tank and balls are made of stainless steel. The ratio is 4:1, the rotational speed is 180r / min, and the ball milling time is 1h.

[0045] The uniformly mixed powder is pressed into shape, and the sintered sample used for the electrochemical test is a disc; the one used for the mechanical performance test is a tensile sample, and the size of the tensile sample is as follows figure 2 shown.

[0046] according to figure 1 For the heat treatment curve shown, the pressed sample is heated up to 350°C for 120 minutes under vacuum conditions, held for 30 minutes, then heated to 750°C for 80 minutes, held for 60 minutes, and then heated to 1350°C for 1 hour after 90 minutes. Cool to obtain powder metallurgy austenitic stainless steel.

Embodiment 2

[0048] According to the method of Example 1, the ratio of raw materials was replaced by 99.2wt% of 316L stainless steel powder, 0.3wt% of yttrium oxide powder and 0.5% of zinc stearate.

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Abstract

The invention provides a preparation method of powder metallurgy austenitic stainless steel, comprising the following steps: mixing austenitic stainless steel powder, yttrium oxide powder and lubricant to obtain a mixed powder, and then sequentially pressing and sintering to obtain powder metallurgy Austenitic stainless steel; the mass of the yttrium oxide powder is 0.2-0.4% of the mass of the mixed powder. The invention uses austenitic stainless steel powder and yttrium oxide powder as raw materials, and by adding a certain amount of yttrium oxide powder as a stabilizer, the precipitated phase can be reduced under high temperature conditions, and at the same time, it can be dispersed and distributed in the matrix to achieve matrix grain refinement , thereby reducing porosity, improving the shape and size of inclusions, reducing the number of inclusions in steel, and effectively reducing the number of pitting sources; at the same time, rare earth oxides in steel can effectively desulfurize and reduce inclusions in steel and modify the inclusions, thereby enhancing the corrosion resistance of the steel matrix.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy materials, in particular to a powder metallurgy austenitic stainless steel and a preparation method thereof. Background technique [0002] The use of stainless steel has derived countless types so far. People purposefully manufacture and use stainless steel with different properties according to the needs of different occasions. Among them, 316 stainless steel is one of the most commonly used steel types. 316 stainless steel (Cr17Ni12Mo2), which contains C≤0.08%, Si≤1.0%, Mn≤2.0%, P≤0.035%, S≤0.03%; and 316L stainless steel (Cr17Ni14Mo2), except that the carbon content is reduced to below 0.03%, The content of other elements is the same as that of 316 stainless steel. 316L stainless steel belongs to the AISI 300 austenitic stainless steel series and appeared in the 1970s. It is a Cr-Ni-Mo type ultra-low carbon stainless steel developed to improve corrosion resistance. It has excellent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F3/10
CPCB22F3/1007B22F2999/00B22F2998/10B22F1/10B22F2009/043B22F3/02B22F2201/20
Inventor 宫建红李延君李会祥冯胜男刘学男王一喆
Owner SHANDONG UNIV
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