稀土及热处理对中铬半钢的冲击疲劳性能的影响  

Effect of Rare Earth Elements and Heat Treatment on Impact Fatigue Property of Medium 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：《金属热处理》2002年第1期25-26,共2页Heat Treatment of Metals

摘　　要：研究了稀土元素及热处理对中铬半钢冲击疲劳性能的影响。结果表明 ,稀土与热处理复合作用 ,可加速网状共晶碳化物向孤立的块状转变 ,促进粒状碳化物的析出 ,有效地推迟裂纹的形成 ,降低裂纹扩展速率 ,提高中铬半钢的冲击疲劳抗力。The effect of RE and heat treatment on impact fatigue property of medium chromium cast semi steel was studied in this paper by means of impact fatigue testing machine.The experimental results show that by combining rare earth modification with heat treatment the network eutectic carbides change into blocky carbides and precipitation of granular carbides are accelerated.As a result crack forming time is delayed and crack propagation rate is reduced and the impact fatigue resistance can be increased effectively.

关 键 词：中铬半钢 稀土变质 热处理 冲击疲劳性能 

分 类 号：TG142.72[一般工业技术—材料科学与工程] TG161[金属学及工艺—金属材料]