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C70-TiC reinforced high-quality stainless steel and preparation method thereof

A c70-tic, stainless steel technology, applied in the field of alloy material manufacturing, can solve the problems of poor wear resistance and unsatisfactory corrosion resistance, and achieve the effect of improving comprehensive performance, improving corrosion resistance and high plastic toughness

Active Publication Date: 2019-02-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the existing austenitic stainless steel has poor wear resistance and its corrosion resistance cannot meet the requirements of working in a special environment, and provides a method for preparing an ultrafine austenitic stainless steel, specifically It is a C70-TiC reinforced high-quality stainless steel and its preparation method. It is a method of combining mechanical alloying with powder metallurgy technology to finally obtain an ultra-fine austenitic stainless steel to improve the shortcomings of the existing austenitic lack of wear resistance. , and improve its corrosion resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In the first step, Cr powder, Ni powder, TiC, ferrochromium nitride, C70 and Fe powder are in the following mass ratio: Cr: Ni: FeNC: TiC: C70, Fe are 20:10:14:3.5:0.5: 52 formulated as raw material. Put the raw materials into a ball mill tank and perform ball milling to obtain mixed powder, wherein the ball milling parameters are as follows: the rotational speed is 300r / min, and the ball-to-material ratio is 20:1. The ball milling time is 60h, and the ball milling process is carried out under an argon atmosphere to prevent oxidation.

[0032] In the second step, the above-mentioned mixed powder is put into a tablet press and cold-pressed into a prefabricated block, wherein the cold-pressing pressure is 40Mpa.

[0033] In the third step, put the prefabricated block made after cold pressing into a vacuum hot pressing sintering furnace for hot pressing sintering, wherein the sintering temperature is 1000°C and the sintering pressure is 60Mpa. The time is 45 minutes.

...

Embodiment 2

[0037] In the first step, Cr powder, Ni powder, TiC, ferrochromium nitride, C70 and Fe powder are in the following mass ratio: Cr: Ni: FeNC: TiC: C70, Fe are 22:10:12:4: 0.8: 51.2 Formulated as raw material. The raw materials were put into a ball mill tank for ball milling to obtain a mixed powder, wherein the ball milling parameters were as follows: the rotational speed was 350r / min, and the ball-to-material ratio was 30:1. The ball milling time is 80h, and the ball milling process is carried out under an argon atmosphere to prevent oxidation.

[0038] In the second step, the above-mentioned powder is put into a tablet press and cold-pressed into a prefabricated block, wherein the cold-pressing pressure is 55Mpa.

[0039] In the third step, put the prefabricated block made after cold pressing into a vacuum hot pressing sintering furnace for hot pressing sintering, wherein the sintering temperature is 1100°C and the sintering pressure is 120Mpa. The time is 50 minutes.

[0...

Embodiment 3

[0043] In the first step, Cr powder, Ni powder, TiC, ferrochromium nitride, C70, and Fe powder are in the following ratio: Cr: Ni: FeNC: TiC: C70, Fe are 22:10:12:4:1.2: 52. Put it into a ball mill tank for ball milling, wherein the ball milling parameters are as follows: the rotating speed is 320r / min, and the ball-to-material ratio is 23:1. The ball milling time is 50h, and the ball milling process is carried out under an argon atmosphere to prevent oxidation.

[0044] In the second step, the above powder is put into a tablet press and cold-pressed into a prefabricated block, wherein the cold-pressing pressure is 60Mpa.

[0045] In the third step, put the block made by cold pressing into a vacuum hot pressing sintering furnace for hot pressing sintering, wherein the sintering temperature is 1050°C and the sintering pressure is 140Mpa. The time is 55 minutes.

[0046] The fourth step, heat treatment: heat the obtained stainless steel to 870°C for 0.8h, then oil-cool, then ...

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Abstract

The invention discloses C70-TiC reinforced high-quality stainless steel and a preparation method thereof, and belongs to the technical field of alloy material manufacturing. The problems of poor wearresistance and insufficient corrosion resistance of existing austenitic stainless steel are solved. The stainless steel is composed of, by mass, 18%-22% of Cr, 8%-12% of Ni, 1%-1.5% of N, 3%-5% TiC, 0.3%-1.2% C70, and the balance being Fe and unavoidable impurities. After ball milling of Cr powder, Ni powder, ferrochrome nitride powder, TiC, C70 and iron powder, cold pressing for blocks, hot pressing sintering, repeated heating and temperature reduction, and deformation treatment are carried out to obtain the stainless steel. The stainless steel of an ultra-fine structure has high hardness, high ductility and toughness, high wear resistance and excellent corrosion resistance, and can be used in special environments such as a plastic injection molding industry and a food industry.

Description

technical field [0001] The invention belongs to the technical field of alloy material manufacture, and particularly relates to a method for preparing ultra-fine stainless steel working in a special environment. The obtained ultra-fine stainless steel has excellent wear resistance and corrosion resistance. Background technique [0002] Since stainless steel was invented at the beginning of the 20th century, it has been widely used in industrial production due to its good performance, and occupies an important position in the national economy. In addition to good corrosion resistance, austenitic stainless steel has excellent corrosion resistance in liquid air. It can still maintain high impact toughness and non-magnetic properties at low temperatures. Therefore, the application of austenitic stainless steel is more extensive. With the advancement of industrialization, higher requirements have been put forward for the performance of austenitic stainless steel, such as strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/02C22C38/50C21D1/18C21D6/00
CPCC21D1/18C21D6/004C22C33/0285C22C38/001C22C38/50
Inventor 刘和平高一波孙凤儿程少磊白利忠侯华裴海祥胡保全荆兴斌
Owner ZHONGBEI UNIV
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