当前位置：首页 > 过刊浏览->2021年42卷第8期
共晶高铬铸铁的成分设计与热处理工艺研究
Study on Composition Design and Heat Treatment Process of Eutectic High Chromium Cast Iron
浏览(1855) 下载(14)
- DOI:
- 作者:
- 张业炜 殷凤仕 丁震 薛冰
ZHANG Yewei;YIN Fengshi;DING Zhen;XUE Bing
- 作者单位:
- 山东理工大学机械工程学院
School of Mechanical Engineering,Shandong University of Technology,Zibo 255049,China
- 关键词:
- 共晶高铬铸铁 热处理 耐磨性 硬度
high chromium cast iron heat treatment wear resistance hardness
- 摘要:
- 通过Jmatpro软件模拟设计了一种共晶成分的高铬铸铁,并研究了热处理工艺对共晶高铬铸铁的显微组织、硬度、耐磨性的影响。结果表明,共晶区间含碳量范围随Cr含量的升高而下降,近似呈线性关系,共晶区间含碳量为0.2%。共晶高铬铸铁成分设计中确定Cr含量为19%~20%,对应含碳量为3.45%~3.65%为共晶成分且满足Cr/C比在5~6的设计条件。共晶高铬铸铁淬火温度为1 000℃和1 050℃时,250℃和400℃回火时,磨损失重变化不明显;在400~500℃回火会出现二次硬化现象,硬度迅速升高,磨损失重大幅度减小;回火温度高于500℃时,马氏体分解严重,硬度迅速下降,磨损失重迅速增加。实验材料的热处理最佳工艺为1 000℃淬火×2 h空冷+500℃回火×2 h空冷,其组织主要为回火马氏体,M7C3碳化物、二次碳化物、残余奥氏体。该热处理工艺下实验材料的维氏硬度值是843 HV1,磨损失重为4.9 mg。
A kind of eutectic high chromium cast iron was simulated and designed by JMATPRO software,and the effect of heat treatment process on the microstructure,hardness and wear resistance of eutectic high chromium cast iron was studied. The results show that the carbon content in the eutectic interval decreases with the increase of Cr content,and the carbon content in the eutectic interval is 0. 2%. In the composition design of eutectic high chromium cast iron,it is determined that the Cr content is 19% ~ 20%,the corresponding carbon content is 3. 45% ~ 3. 65%,which is eutectic and meets the design conditions of Cr/C ratio in 5 ~ 6. When quenching temperature is 1 000 ℃ and 1 050 ℃,and when tempering temperature is 250 ℃ and 400 ℃,the wear weight loss of eutectic high chromium cast iron does not change obviously. At 400 ~ 500 ℃ tempering will appear secondary hardening phenomenon,hardness increases rapidly,wear weight loss greatly reduced. When the tempering temperature is higher than 500 ℃,the martensite decomposes seriously,the hardness decreases rapidly,and the wear weight loss increases rapidly. The optimal heat treatment process of the experimental material is 1 000 ℃ quenching for 2 h air cooling and 500 ℃tempering for 2 h air cooling,and its structure is mainly tempered martensite,M7C3 carbides,secondary carbides,residual austenite. The Vickers hardness value of the experimental material under the heat treatment process is 843 HV1,and the wear loss is 4. 9 mg.