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

被引：0

作者：

Yu X. ^{[1
]}

Wang S. ^{[2
]}

Zheng D. ^{[2
]}

Wang Q. ^{[3
]}

Su Y. ^{[4
]}

Zhao W. ^{[1
]}

Xing F. ^{[1
]}

机构：

[1] School of Mechanical Engineering, Shenyang University of Technology, Shenyang

[2] School of Materials Science and Engineering, Shenyang University of Technology, Shenyang

[3] Shenyang Blower Group Co. Ltd., Shenyang

[4] School of Mechanical and Power Engineering, Shenyang University of Chemical Technology, Shenyang

来源：

Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research | 2022年 / 36卷 / 04期

关键词：

8Cr4Mo4V; Graded solution treatment; High temperature bearing steel; Mechanical property; Metallic materials;

D O I：

10.11901/1005.3093.2021.702

中图分类号：

学科分类号：

摘要：

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℃ (the primary solution treatment was set at 1060℃×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. © 2022, Editorial Office of Chinese Journal of Materials Research. All right reserved.

引用

页码：287 / 297

页数：10

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