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Effect of Cryogenic Treatment on Property of 14Cr2Mn2V High Chromium Cast Iron Subjected to Subcritical Treatment

LIU Haohuai , WANG Jun , YANG Hongshan , SHEN Baoluo , GAO Sheji , HUANG Sijiu

钢铁研究学报(英文版)

Effect of cryogenic treatment on the microstructure, hardening behavior and abrasion resistance of 14Cr2Mn2V high chromium cast iron (HCCI) subjected to subcritical treatment was investigated. The results show that cryogenic treatment after subcritical treatment can obviously improve the hardness and abrasion resistance of HCCI because abundant retained austenite is transformed into martensite and fine secondary carbides [(Fe, Cr)23C6] precipitate. The amount of martensite and precipitated secondary carbide in HCCI experiencing subcritical treatment followed by cryogenic treatment was more than that experiencing the subcritical treatment followed by air cooling. When the abrasion resistance of HCCI reaches the maximum, its microstructure contains about 15% retained austenite. Cryogenic treatment can further reduce the austenite content but the retained austenite cannot be transformed into martensite completely.

关键词: high chromium cast iron;cryogenic treatment;subcritical treatment;martensite transformation;abrasion resistance