不同类型碳化物在基体中的分布对高速钢轧辊性能的影响  

Effects of Carbides Distribution in Matrix on Thermal Fatigue and Wear Properties of High Speed Steel Rolls

作　　者：宋亮[1] 张晓丹[1] 孙大乐[2] 刘伟[1] 

机构地区：[1]清华大学材料科学与工程系,北京100084 [2]宝山钢铁股份有限公司技术中心设备所,上海201900

出　　处：《金属热处理》2006年第9期1-4,共4页Heat Treatment of Metals

基　　金：国家科技部"863"计划重大项目(2003AA331050)

摘　　要：通过对具有不同组织的两种进口高速钢轧辊及一种国产辊环进行冷热疲劳试验及摩擦磨损试验,研究了不同类型碳化物在基体中的分布对高速钢轧辊性能的影响。结果表明,在晶界处分布的大块未溶共晶碳化物周围容易萌生裂纹,且大块的未溶共晶碳化物在经过多次冷热疲劳循环后容易碎裂并脱落,在磨损过程中,大块未溶共晶碳化物同样容易发生碎裂及脱落现象,大大影响耐磨损性能;裂纹容易沿晶界处分布的碳化物扩展,且晶界处分布大块的未溶共晶碳化物或碳化物联结成网状容易促进裂纹的扩展;晶界处M2C型碳化物与晶界成一定角度分布,具有一定阻碍裂纹扩展的作用;不同类型碳化物在基体中的弥散分布对于提高其耐磨性能具有很大作用。Effects of carbides distribution on thermal fatigue and wear properties of the high speed steel rolls were studied. SEM, thermal fatigue test and wear test were conducted on high speed steel rolls with different carbides distributions. The results show that micro-cracks initiated easily near the bulks of undissolved eutectic carbides. During the thermal fatigue test and wear test,the bulks of undissolved eutectic carbides tended to disintegrate and fall off from the matrix. The micro-cracks were rapidly facilitated by distributions of undissolved eutectic carbides and network-like carbides along grain boundaries. Meanwhile, the crack propagation was delayed by the distribution of M2C carbides with large misorientation to grain boundaries. The wear resistance could be improved by dispersible distribution of various carbides in matrix.

关 键 词：高速钢轧辊 冷热疲劳性能 磨损性能 碳化物分布 

分 类 号：TG115.5[金属学及工艺—物理冶金]