RP120-80大型挤压辊锻件缺陷修复研究  

Study on Defect Recovery of Heavy Forgings Squeeze Roller RP120-80

作　　者：苏娟华[1] 刘晓斐[1] 史宇麟 

机构地区：[1]河南科技大学材料学院,河南洛阳471003 [2]中信重型机械公司,河南洛阳471039

出　　处：《热加工工艺》2008年第7期83-85,88,共4页Hot Working Technology

基　　金：河南科技大学博士科研启动基金资助项目(20070411)

摘　　要：新产品RP120-80挤压辊是典型的大型短粗轴类锻件,在冷加工后易出现超声波探伤超标现象。通过低倍酸洗、断口试验、扫描电镜及能谱分析等手段,确定了缺陷为夹杂性裂纹,夹杂物的主要成分是Al2O3、Fe2O3及少量CaO,并分析了缺陷的成因、影响因素及控制措施,提出采用两次镦拔锻造新工艺。试制结果表明,采用新工艺可以控制大型锻件中的夹杂物形态,修复裂纹,改善锻件内在质量。The new kind of heavy forgings, RP120-80 squeeze rollers,were partly unqualified for supersonic inspection after cold extrusion. By macroscopic acidwashing, fracture examination, SEM and energy spectrum analysis for defects, it was ascertained that the defects were inner crack caused by Al2O3, Fe2O3 and a tittle CaO inclusions. After analyzing the origin, influencing factors and controlling methods of defects, a new type of two times upsetting and stretching process was put forward. After using new technology, inclusions can be controlled and inner cracks can recover effectively.

关 键 词：大锻件 夹杂性裂纹 检测 裂纹修复 

分 类 号：TG316.12[金属学及工艺—金属压力加工]