齿轮毂开裂原因分析  

Cracking Analysis of Gear Hub

作　　者：刘敏[1] 孙宜强[1] 王俊霖[1] 张萍[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《武汉工程职业技术学院学报》2014年第3期65-67,74,共4页Journal of Wuhan Engineering Institute

摘　　要：采用金相显微镜和扫描电镜等对开裂轮毂进行了观察和分析。结果表明齿轮毂存在Cr、Mo等元素偏析并观察到较多夹杂物和偏析条带;分析认为Cr、Mo等元素偏析导致偏析条带,在热锻时偏析条带之间会产生较大的内应力,同时夹杂物的存在破坏了基体的连续性,二者共同作用导致轮毂开裂。The sample of the cracking hub was observed and analyzed by means of optical microscope and electron microprobe to find out the causes for the cracking .The results showed that Cr ,Mo ,some bright segregation bands and many inclusions were observed in the hub .The observations and analysis concluded that the segregation bands caused by segregation of Cr ,Mo would produce a great stress be-tween segregation bands when the hub was forged while the presence of inclusions destroyed the continuity of the base plate ,causing the crack and the crack expanding .

关 键 词：轮毂开裂 元素偏析 夹杂物 

分 类 号：TG115.2[金属学及工艺—物理冶金]