Effect of heat treatment on microstructure and mechanical properties of composite cast high chromium high carbon steel/carbon steel wear-resistant materials

doi:10.13251/j.issn.0254-6051.2022.08.027

Abstract

Abstract: High chromium high carbon steel/carbon steel composite wear-resistant steel was prepared by using liquid-solid composite method, and the effect of different heat treatments on microstructure and properties of the composite wear-resistant steel treated by austempering and quenching-tempering was studied by means of scanning electron microscope, hardness tester and impact property test, respectively. The types and contents of the equilibrium phases in the tested steel were calculated by using JMatPro software. The results show that the microstructure of the as-cast high chromium high carbon steel/carbon steel composite wear-resistant layer is composed of network carbide and granular pearlite. The substrate layer is a widmanstatten structure formed by coarse austenite at a faster cooling rate. After austempering, the microstructure of the wear-resistant layer of the tested steel is network carbide+fine-grained carbide+austenite+ferrite, and the substrate layer consists of massive ferrite and pearlite. After quenching and tempering, the microstructure of the wear-resistant layer of the tested steel is network carbide+fine-grained carbide+martensite, and the substrate layer is martensite+upper bainite. The hardness of the wear-resistant layer after austempering is 493 HBW, the impact absorbed energy is 2.6 J, and the impact absorbed energy of the substrate layer is 79.2 J. After quenching and tempering, the hardness of the wear-resistant layer is 629 HBW, the impact absorbed energy is 1.6 J, and the impact absorbed energy of the substrate layer is 20.0 J. Considering that the composite wear-resistant steel needs to resist high impact load, the better heat treatment process is austempering: heating at 880 ℃ for 2 h then cooling to 320 ℃ and at which holding for 5.5 h.

Key words: high chromium high carbon steel, composite casting, austempering, quenching-tempering, microstructure, properties

CLC Number:

TG161

Gao Zhizhe, Chen Xiaoyan, Wang Yongjin, Su Shengrui, Chen Junhao, Li Jiakang, Chen Zhengjia. Effect of heat treatment on microstructure and mechanical properties of composite cast high chromium high carbon steel/carbon steel wear-resistant materials[J]. Heat Treatment of Metals, 2022, 47(8): 163-167.

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