Relations of abrasion resistance and hardness of 16Cr-3C white irons with retained austenite content

Zhiping Sun, Rulin Zuo, Cong Li, Baoluo Shen, Shengji Gao, and Sijiu Huang School of Materials Science and Engineering, Sichuan University, Chengdu 610065, China School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China National Key Laboratory for Nuclear Fuel and Materials. Nuclear Power Institute of China, Chengdu 610041. China Sijiu Rare Earth Alloy Foundry, Shuangliu 610211, China

摘 要：<正>The relationship between the retained austenite content of the matrix in 16Cr-3C white irons and the abrasion resistance was investigated. The results show that: （1） the abrasion resistance can be improved by sub-critical heat treatment, which could be attributed to the decrease of the retained austenite content; （2） both the abrasion resistance and hardness can be improved by controlling the retained austenite content below 20%-30% and arrive at the maximum when the retained austenite content is reduced to about 10%; （3） the abrasion resistance decreases abruptly once the retained austenite content is lower than 10%, which stems from both the in situ transformation of （Fe, Cr）23C6 to M3C carbides and the formation of pearlitic matrix.

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