Effect of heat treatment on microstructure and hardness of ZCPC-BTMCr20 high chromium cast iron

doi:10.13251/j.issn.0254-6051.2021.09.016

Abstract

Abstract: A hammerhead for crushing ore produced by factory had a relatively low service life, and it fails due to severe wear only in about 20 h. The influences of different heat treatment processes on hardness and microstructure of the hammerhead were studied. The results show that the composition of the hammerhead specimen is close to that of the ZCPC-BTMCr20 high chromium cast iron, the matrix is a softer pearlite structure, and the macroscopic Rockwell hardness is only 41.1 HRC, which does not meet the requirements of relevant standards. After heating and holding at 960 ℃, 985 ℃, 1010 ℃ respectively, martensite or austenite matrix can be obtained by controlling the cooling rate, and the hardness of the matrix is improved, with the macroscopic hardness greater than 58 HRC. Based on comprehensive analysis for ZCPC-BTMCr20 high chromium cast iron, it is recommended to adopt a heat treatment system of 960 ℃ air quenching+450 ℃ tempering, so the Rockwell hardness can reach 60.1 HRC.

Key words: high chromium cast iron, heat treatment, microstructure, hardness

CLC Number:

TG163

Ping Zhaofu, Zhou Yi, Zheng Baochao, Tu Xiaohui, Li Wei. Effect of heat treatment on microstructure and hardness of ZCPC-BTMCr20 high chromium cast iron[J]. Heat Treatment of Metals, 2021, 46(9): 95-103.

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