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Method for eliminating heat treatment mixed crystals of W9Cr4V2Mo steel bearing part

A technology of parts and mixed crystals, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of inconspicuousness and improvement of mixed crystals, and achieve the effect of eliminating mixed crystals and improving mixed crystals

Inactive Publication Date: 2021-07-02
AVIC HARBIN BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the improvement effect of the serious mixed crystal phenomenon in the heat treatment process of W9Cr4V2Mo steel bearing parts is not obvious, and to provide a method for eliminating the heat treatment mixed crystal of W9Cr4V2Mo steel bearing parts

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  • Method for eliminating heat treatment mixed crystals of W9Cr4V2Mo steel bearing part

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specific Embodiment approach 1

[0011] Specific implementation mode 1: In this implementation mode, a method for eliminating heat-treated mixed crystals of W9Cr4V2Mo steel bearing parts is specifically carried out according to the following steps:

[0012] W9Cr4V2Mo steel bearing parts need to be annealed before mixed crystals appear after quenching in a vacuum air quenching furnace. The annealing process is: preheating → complete austenitization → primary isothermal → incomplete austenitization → secondary isothermal → cooling .

[0013] The mixed crystal structure of W9Cr4V2Mo steel is caused by structure inheritance or component segregation, so blocking the structure inheritance and further homogenizing the distribution of carbides and alloying elements can eliminate the mixed crystal structure. Therefore, if it is found that there is a mixed crystal structure in the W9Cr4V2Mo steel after heating and quenching, the high temperature and short-time spheroidizing annealing process in this embodiment can grea...

specific Embodiment approach 2

[0015] Embodiment 2: This embodiment differs from Embodiment 1 in that: the annealing equipment is a vacuum air quenching furnace. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the heating rate from room temperature to the preheating stage is 8°C / min, the preheating temperature is 740-760°C, and the time is 2h. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for eliminating heat treatment mixed crystals of a W9Cr4V2Mo steel bearing part, belongs to the technical field of metal material heat treatment, and particularly relates to the method for eliminating the heat treatment mixed crystals of the W9Cr4V2Mo steel bearing part. The method aims at solving the problem that in the heat treatment process of the W9Cr4V2Mo steel bearing part, the serious mixed crystal phenomenon improving effect is not obvious. According to the method, the W9Cr4V2Mo steel bearing part needs to be subjected to annealing treatment before the mixed crystals appear in a vacuum gas quenching furnace through quenching, and the annealing technological process comprises preheating, complete austenitizing, primary isothermal treatment, incomplete austenitizing, secondary isothermal treatment and cooling. The method is used for eliminating the heat treatment mixed crystals of the W9Cr4V2Mo steel bearing part.

Description

technical field [0001] The invention belongs to the technical field of heat treatment of metal materials, in particular to a method for eliminating mixed crystals in heat treatment of W9Cr4V2Mo steel bearing parts. Background technique [0002] W9Cr4V2Mo is a kind of high temperature bearing steel. In addition to maintaining high hardness under high temperature conditions, it also has the characteristics of wear resistance, fatigue resistance, oxidation resistance, corrosion resistance and impact resistance. The tungsten element in it can form carbides and can be partially dissolved in the steel. The tungsten atoms dissolved in the martensite have a strong binding force with the carbon atoms, which makes the steel have good stability against tempering. Its highest use The temperature can reach 450°C. [0003] Due to the high content of alloying elements in W9Cr4V2Mo steel, segregation of alloying elements and uneven distribution of carbides often exist in the metallurgical ...

Claims

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Application Information

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IPC IPC(8): C21D9/40C21D1/20C21D1/26C21D6/00
CPCC21D9/40C21D6/002C21D1/26C21D1/20
Inventor 安敏王伟錡于安乐孙勇夏云志袁超王教翔
Owner AVIC HARBIN BEARING
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