稀土元素对低铬半钢热疲劳性能的影响  

Effect of Rare Earths on Thermal Fatigue Property of Low Chromium Cast Semi-Steel

作　　者：常立民[1] 刘建华[2] 于升学[2] 谌岩[2] 

机构地区：[1]四平师范学院分析测试中心,吉林四平136000 [2]燕山大学材料与化工学院,河北秦皇岛066004

出　　处：《中国稀土学报》2002年第1期85-87,共3页Journal of the Chinese Society of Rare Earths

基　　金：河北省科学技术研究指导计划资助项目 ( 9412 2 12 3)

摘　　要：研究了稀土元素对低铬半钢铸态及经热处理后组织中的共晶碳化物形状的影响 ,在此基础上着重研究了该材料的热疲劳性能。结果表明 :稀土元素能改善共晶碳化物的形状 ,抑制热疲劳裂纹的萌生与扩展 ,提高其热疲劳性能 ,尤其稀土变质后再经热处理后效果更明显。当试样经 0 2 0 % (质量分数 )稀土变质后经 95 0℃ ,3h正火处理时 ,热疲劳性能最佳。The effect of rare earths on eutectic carbide morphology of low chromium cast semi steel and low chromium cast semi steel after heat treatment, and thermal fatigue property of low chromium cast semi steel were studied. The results show that rare earths in low chromium cast semi steel can improve eutectic carbide morphology, restrain thermal fatigue crack forming and propagation, improve thermal fatigue property. The result of low chromium cast semi steel after rare earths modification going through heat treatment is more noticeable. When normalizing is taken at 950 ℃, 3 h after 0 20% (mass fraction) rare earths modification, the best thermal fatigue property is obtained.

关 键 词：稀土 低铬半钢 热疲劳性能 变质处理 热处理 

分 类 号：TG113.255[金属学及工艺—物理冶金] TG156.6[金属学及工艺—金属学]