Effect of Graded Solution Treatments on Microstructure and Hardness of 8Cr4Mo4V Steel

doi:10.11901/1005.3093.2021.702

Chinese Journal of Materials Research

2022, Vol. 36

Issue (4): 287-297 DOI: 10.11901/1005.3093.2021.702

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Effect of Graded Solution Treatments on Microstructure and Hardness of 8Cr4Mo4V Steel

YU Xingfu¹(

), WANG Shijie², ZHENG Dongyue², WANG Quanzhen³, SU Yong⁴, ZHAO Wenzeng¹, XING Fei¹

^1.School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^3.Shenyang Blower Group Co. Ltd., Shenyang 110869, China
^4.School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Cite this article:

YU Xingfu, WANG Shijie, ZHENG Dongyue, WANG Quanzhen, SU Yong, ZHAO Wenzeng, XING Fei. Effect of Graded Solution Treatments on Microstructure and Hardness of 8Cr4Mo4V Steel. Chinese Journal of Materials Research, 2022, 36(4): 287-297.

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Abstract

The effect of graded solution treatments, i.e. a primary solution treatment at 1000~1060℃ and a secondary solution treatment at 1080~1100℃, on the microstructure and hardness of the 8Cr4Mo4V aviation bearing steel was assessed by means of SEM, TEM and hardness tester. The results show that with the increase of the primary solution temperature from 1000℃ to 1060℃ (the secondary solution treatment was set at 1080℃×10 min), the volume fraction of undissolved carbides in the steel decreased from 4.37% to 3.43%, but the grain growth was not obvious. However, with the increase of secondary solution temperature from 1080℃ to 1100°C (the primary solution treatment was set at 1060°C×30 min), the volume fraction of undissolved carbides gradually decreased from 3.51% to 2.84%, and the average grain size increased significantly. The tempered hardness of the steel can reach a high value when the primary solution temperature is low or the secondary solution temperature is high. In order to improve the hardness and prevent grain coarsening of the steel, the primary solution temperature within the range of 1020~1050℃ is suitable, and the secondary solution temperature is suitable within 1080~1090℃. After being solution treated according to the specifications of 1020℃×20 min+1090℃×10 min, the average grain size of the steel is 12.1 μm, the tempered hardness is 63.8 HRC, the impact absorption energy is 15.28 J, and the tensile strength of the steel is 2664.3 MPa.

Key words: metallic materials 8Cr4Mo4V high temperature bearing steel graded solution treatment mechanical property

Received: 24 December 2021

ZTFLH:

TG142.1

Fund: Liaoning Revitalization Talents Program(XLYC1902022);Scientific Research Funding Project of Liaoning Provincial Department of Education(LJKZ0113)

About author: YU Xingfu, Tel: 13604072060, E-mail: yuxingfu@163.com

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	Xingfu YU
	Shijie WANG
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	Quanzhen WANG
	Yong SU
	Wenzeng ZHAO
	Fei XING

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.702 OR https://www.cjmr.org/EN/Y2022/V36/I4/287

Table 1 Chemical composition of experimental 8Cr4Mo4V steel (mass fraction, %)

Fig.1 Heat treatment process of 8Cr4Mo4V steel, T₁ and t₁ are the primary solution temperature and time, and T₂ and t₂ are the secondary solution temperature and time

Fig.2 Isothermal quenched microstructure of 8Cr4Mo4V steel treated by different primary solution treatments (a) 1000℃; (b) 1020℃; (c) 1050℃; (d) 1060℃

Fig.3 Energy spectrum analysis of carbides with different shapes and statistical graphs of grain size and carbides (a) arrow 1 in Fig.2a; (b) arrow 2 in Fig.2a; (c) arrow 3 in Fig.2a; (d) arrow 4 in Fig.2a; (e) statistical graph of average grain size; (f) statistical graph of carbides

Fig.4 Variation of volume fraction of undissolved carbides and average grain size with primary solution temperature

Fig.5 Tempered microstructure of 8Cr4Mo4V steel treated by different primary solution treatments (a) 1000℃; (b) 1020℃; (c) 1050℃; (d) 1060℃

Fig.6 Tempered microstructure of the 8Cr4Mo4V steel treated by different primary solution treatments (a) 1000℃; (b) 1020℃; (c) 1050℃; (d) 1060℃

Fig.7 Rockwell hardness of 8Cr4Mo4V steel treated by different primary solution treatments

Fig.8 Isothermal quenched microstructure (a, c, e) and tempered microstructure (b, d, f) of 8Cr4Mo4V steel after different secondary solution treatments (a) and (b), 1080℃; (c) and (d), 1090℃; (e) and (f), 1100℃

Fig.9 Variation of volume fraction of undissolved carbides and average grain size with secondary solution temperature

Fig.10 Relationship between hardness of 8Cr4Mo4V steel and second solution temperature

Fig.11 Schematic diagram of grain growth at different solution temperatures

Fig.12 Diagram of carbide dissolution and reprecipitation of the steel treated by different hierarchical solution treatments (a) and (a'), 1000~1080℃; (b) and (b'), 1020~1080℃; (c) and (c'), 1050~1080℃; (d) and (d'), 1060~1080℃; (e) and (e'), 1060~1090℃; (f) and (f'), 1060~1100℃

Fig.13 Average grain size and tempered hardness of the 8Cr4Mo4V steel treated by different hierarchical solution treatments (a) different primary solution temperature; (b) different secondary solution temperature

Fig.14 Images of metallographic grain (a) and microstructure (b) of the specimen treated by verification process

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