Effect of austenitizing process on microstructure of Cr14Mo4V high temperature bearing steel

doi:10.13251/j.issn.0254-6051.2022.08.002

Abstract

Abstract: Evolution of microstructure with austenitizing parameters of the high temperature bearing steel Cr14Mo4V was studied. The carbides, retained austenite, grain size and hardness of the Cr14Mo4V steel were analyzed by means of OM, XRD, SEM and hardness test. The results show that the microstructure of the quenched high temperature Cr14Mo4V bearing steel mainly includes quenched martensite, retained austenite and band-shaped carbides. The microstructure evolution process is more sensitive to the austenitizing temperature. The content of retained austenite gradually increases with the increase of austenitizing temperature, and the same trend to grain size, the carbides gradually dissolve, and the distribution of alloying elements of band-shaped carbides changes. The hardness of the Cr14Mo4V bearing steel increases slightly at first and then decreases significantly with the increase of austenitizing temperature, which is mainly affected by matrix solid solubility, retained austenite content and grain size.

Key words: Cr14Mo4V bearing steel, austenitizing, retained austenite, carbides, hardness

CLC Number:

TG142.4

Zhou Lina, Liu Ming, Gao Xiang, Wang Wenxue, Tong Rui. Effect of austenitizing process on microstructure of Cr14Mo4V high temperature bearing steel[J]. Heat Treatment of Metals, 2022, 47(8): 7-15.

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