Effect of heat treatment process on microstructure and hardness of high chromium cast iron roller produced by centrifuge casting

doi:10.13251/j.issn.0254-6051.2020.02.021

Abstract

Abstract:

Microstructure, carbides and hardness of high chromium cast iron roller as-cast by centrifuge casting and quenched and tempered were studied by optical microscope, scanning electron microscope, X-ray diffractometer and Rockwell hardness tester. The results show that the microstructure of the roller as cast is mainly composed of austenite and a few martensite and coarse plate or blocky (Cr, Fe)₇C₃ carbide. After heat treatment at different temperatures, tempered martensite and (Cr, Fe)₇C₃ and Cr₇C₃ carbides are obtained, and the plate-like carbides are replaced by fine block or elliptical ones. The hardness of the as-cast high chromium roller is 56.0 HRC, then increases to about 65.5 HRC after 950 ℃ quenching +400 ℃ tempering.

Key words: high chromium cast iron roller, heat treatment, carbide, hardness

CLC Number:

TG143.1

Cao Yu, Song Xinli, Zhen Aiqin, Chen Rongdong, Jia Juan, Bi Yunjie. Effect of heat treatment process on microstructure and hardness of high chromium cast iron roller produced by centrifuge casting[J]. HTM, 2020, 45(2): 108-113.

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