稀土变质与热处理复合作用对低铬半钢冲击疲劳行为的影响  

The Effect of Rare Earth Modification and Heat Treatment on Impact Fatigue Behavior of Low Chromium Cast Semi-steel

作　　者：秦秀娟[1] 邵光杰[1] 刘建华[1] 

机构地区：[1]燕山大学材料与化工学院,河北秦皇岛066004

出　　处：《热加工工艺》2001年第4期37-38,共2页Hot Working Technology

摘　　要：利用冲击疲劳试验 ,研究了稀土变质及热处理对低铬半钢抗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块状的转变 ,促进粒状碳化物的析出 ,有效地推迟裂纹产生的时间 ,降低裂纹扩展速率 ,提高其冲击疲劳抗力。The effect of RE modification and heat treatment on impact fatigue property of low chromium cast semi steel was studied by means of impact fatigue test.The experimental results show that by combining rare earth modification with heat treatment the eutectic carbide network changes into carbide piece and precipitation of granular carbide are accelerated as a result deferring crack forming time and reduce crack propagation speed and increase the impact fatigue resistance effectively.

关 键 词：稀土变质 热处理 冲击疲劳 低铬半钢 

分 类 号：TG142.72[一般工业技术—材料科学与工程] TG143.9[金属学及工艺—金属材料]