Method for optimized quenching process for obtaining 8Cr4Mo4V steel

A process, austempering technology, applied in the direction of quenching agent, manufacturing tools, heat treatment equipment, etc., can solve the problems of inability to effectively control the steel structure, unsatisfactory wear resistance, low hardness, etc., to achieve space for performance improvement, the effect is remarkable , the effect of low quenching temperature

Active Publication Date: 2020-07-14
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After tempering, bainite, tempered troostite (or tempered sorbite), residual carbides and precipitated carbides are obtained. It has high strength, good toughness and excellent comprehensive properties, but its hardness is low and its wear resistance is low. unsatisfactory
In addition, a single quenching treatment cannot effectively control the steel structure

Method used

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  • Method for optimized quenching process for obtaining 8Cr4Mo4V steel
  • Method for optimized quenching process for obtaining 8Cr4Mo4V steel
  • Method for optimized quenching process for obtaining 8Cr4Mo4V steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] First, determine the heating and solid solution process of 8Cr4Mo4V steel: take three spheroidized annealed steel samples and heat them at 1095 ° C for 20 minutes, 30 minutes, and 40 minutes respectively for heating and solution treatment, and then oil quenching to obtain the first batch of quenched samples; The test found that the micrograin size grade of the sample with a temperature of 1095°C and a heat preservation of 20 minutes was the highest, which was 9.0. It was determined that 1095°C and 20 minutes were the heat preservation temperature and heat preservation time of the heating solid solution process; at the same time, after a series of tests And microstructure observation confirmed that the austempering temperature is about 200℃. On this basis, heat treatment is carried out according to the following steps:

[0037] (1) Heat and solid solution treat 7 spheroidized annealed steel samples at 1095°C for 20 minutes;

[0038] (2) Put the heated sample in step (1)...

Embodiment 2

[0049] First, determine the heating solution process of 8Cr4Mo4V steel: take 4 spheroidizing annealed steel samples and heat solution treatment at 1050 ° C for 60 minutes, 70 minutes, 80 minutes and 90 minutes respectively, and then oil quenching to obtain the first batch of quenched samples; After testing, it was found that the micrograin size grade of the sample with a temperature of 1050°C and a heat preservation of 60 minutes was the highest, which was 9.5. It was determined that 1050°C and 60 minutes were the heat preservation temperature and heat preservation time of the heating solid solution process; at the same time, after a series of Experiments and organizational observations determined that the austempering temperature was about 160°C. On this basis, heat treatment is carried out according to the following steps:

[0050] (1) Heat and solid solution treat 7 spheroidized annealed steel samples at 1050°C for 60 minutes;

[0051] (2) Put the heated sample in step (1)...

Embodiment 3

[0061] First, determine the heating and solid solution process of 8Cr4Mo4V steel: take three spheroidized annealed steel samples and heat them at 1140 °C for 8 minutes, 15 minutes, and 22 minutes respectively for heating and solution treatment, and then oil quenching to obtain the first batch of quenched samples; The test found that the micrograin size grade of the sample with a temperature of 1140°C and a heat preservation of 8 minutes was the highest, which was 7.6 grades. It was determined that 1140°C and 8 minutes were the heat preservation temperature and heat preservation time of the heating solid solution process; at the same time, after a series of tests And microstructure observation confirmed that the austempering temperature is about 280 ℃. On this basis, heat treatment is carried out according to the following steps:

[0062] (1) Heat and solid solution treat 5 spheroidized annealed steel samples at 1140°C for 8 minutes;

[0063] (2) Put the heated sample in step ...

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Abstract

The invention relates to a method for an optimized quenching process for obtaining 8Cr4Mo4V steel. The method comprises the following steps of (1) determining a heating solution process; (2) determining the time point of the highest hardness of isothermal hardening; (3) carrying out composite quenching treatment on the basis of the step (2); (4) selecting an optimized composite quenching process sample; and (5) carrying out tempering treatment on the optimized composite quenching process sample obtained in the step (4) at 510-550 DEG C for 1.8-2.5 h for 3-4 times, and obtaining the 8Cr4Mo4V steel subjected to final optimized heat treatment. The method has the advantages of scientificity, feasibility, simplicity in operation and the remarkable effect, and a space for improving the performance of the 8Cr4Mo4V steel is enlarged.

Description

Technical field: [0001] The invention belongs to the field of special steel heat treatment research, and relates to a quenching technology for effectively improving the structure of 8Cr4Mo4V steel and a method for obtaining an optimized quenching process for 8Cr4Mo4V steel. Background technique: [0002] 8Cr4Mo4V steel is an important high-temperature bearing steel, widely used in the manufacture of high-temperature bearing components such as aero-engines and gas turbines. In recent years, some scholars have conducted extensive research on the heat treatment technology of 8Cr4Mo4V steel, and explored a series of related heat treatment procedures. With the continuous development of industrial technology and production level, the performance requirements of 8Cr4Mo4V steel are getting higher and higher, and the original heat treatment system can no longer meet the needs of the development of the times. It is urgent to further refine and quantify the steel structure, and to exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/20C21D1/58
CPCC21D1/18C21D1/20C21D1/58C21D2211/002C21D2211/008
Inventor 尚丽娟于兴福杨宇晴柳泽禹周驰滨鲍识同
Owner SHENYANG POLYTECHNIC UNIV
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