Effect of Heat Treatment on Microstructure and Wear Resistance of Cr15 High Chromium Cast Iron

Zhang Lei; Huang Xingmin; Weng Yuming; Yong Wei; Wang Lianghui

doi:10.15980/j.tzzz.2015.11.008

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Effect of Heat Treatment on Microstructure and Wear Resistance of Cr15 High Chromium Cast Iron
Vol. 35, Issue 11, Pages: 1146-1150(2015)
Published： 2015 ，
DOI： 10.15980/j.tzzz.2015.11.008

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[1]张雷,黄兴民,翁玉鸣,雍薇,王良辉.热处理对Cr15高铬铸铁组织和耐磨性能的影响[J].特种铸造及有色合金,2015,35(11):1146-1150.

Zhang Lei, Huang Xingmin, Weng Yuming, et al. Effect of Heat Treatment on Microstructure and Wear Resistance of Cr15 High Chromium Cast Iron. [J]. Special Casting & Nonferrous Alloys 35(11):1146-1150(2015)
[1]张雷,黄兴民,翁玉鸣,雍薇,王良辉.热处理对Cr15高铬铸铁组织和耐磨性能的影响[J].特种铸造及有色合金,2015,35(11):1146-1150. DOI： 10.15980/j.tzzz.2015.11.008.

Zhang Lei, Huang Xingmin, Weng Yuming, et al. Effect of Heat Treatment on Microstructure and Wear Resistance of Cr15 High Chromium Cast Iron. [J]. Special Casting & Nonferrous Alloys 35(11):1146-1150(2015) DOI： 10.15980/j.tzzz.2015.11.008.

摘要

分析了失稳和回火处理对Cr15高铬铸铁显微组织及耐磨性能的影响。结果表明

950

000℃下失稳处理促进二次碳化物析出和马氏体转变

淬火态高铬铸铁组织由马氏体、残余奥氏体和二次碳化物组成

基体硬度提高;而低温回火消除了应力集中

获得良好的韧性;Cr15高铬铸铁经1 000℃×3h+空冷+250℃×6h可获得良好的综合力学性能

其硬度（HRC）和无缺口冲击吸收功分别为61.4和7.3J;在干滑动磨损状态下

铸态和淬火态高铬铸铁主要为磨粒磨损

回火态高铬铸铁韧性较好

磨损形式以粘着为主。在干滑动磨损6h后

磨损量从铸态的43.0mg降至淬火态的28.8mg。

Abstract

Effects of destabilized and tempered treatment on microstructure and wear resistance of Cr15 high chromium cast iron（HCCI）were analyzed.The results reveal that destabilizing treatment at 950℃and 1 000 ℃ can promote the secondary carbide precipitation and martensite’s transformation.Asquenched HCCI consists of martensite

retained austenite

primary and secondary carbides

improving the matrix hardness.The low-temperature tempering can relief the stress concentration to take acceptable toughness.Under the experimental condition

quenched at 1 000℃for 3hfollowed by air quenching and tempered at 250 ℃for 6h

the Cr15 HCCI has excellent mechanical properties.Finally

hardness and unnotched impact absorbing energy reach 61.4 HRC and 7.3J

respectively.In dry friction wear state

the as-cast and as-quenched HCCI exhibit mainly abrasive wear.As-tempered HCCI can improve the toughness

and the wear mechanism is mainly characterized by adhesive wear.After 6hdry friction

the wear mass loss is decreased from 43.0mg to 28.8mg.