Effect of heat treatment process on banded structure and impact properties of 15CrMoR steel

doi:10.13251/j.issn.0254-6051.2020.10.025

Abstract

Abstract: Evolution of banded structure during heat treatment and its effect on impact properties of the 15CrMoR steel were analyzed by means of optical microscope, scanning electron microscope and impact testing machine. The results show that ferrite-pearlite banded structure appears when cooling slowly after austenitization, and can be inhibited by increasing cooling rate, but fast cooling may result in non-equilibrium structures such as granular bainite.During tempering, the martensite-austenite islands and bainitic ferrite in the granular bainite decompose gradually to form carbides in the segregation area of carbide-forming elements such as Cr and Mo, leading to the emergence of carbide-rich band and deteriorating the transverse impact properties of the 15CrMoR steel. Homogenized at 1100 ℃ for 7 h could eliminate the banded structure, and improve the transverse impact properties of the steel.

Key words: 15CrMoR steel, banded structure, impact properties, heat treatment

CLC Number:

TG156

Liu Dan, Chen Guangxing, Xu Chen, Xu Xiaochang. Effect of heat treatment process on banded structure and impact properties of 15CrMoR steel[J]. Heat Treatment of Metals, 2020, 45(10): 124-128.

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