塑料模具钢4Cr13调质炸裂分析及改进措施  

Crack Analysis and Improvement for the Quenched and Tempered of Plastic Mold 4Cr13 Steel

作　　者：冯淑玲[1] 刘明[1] 杨天亮 郑继辉 孙秀华[1] 

机构地区：[1]抚顺特殊钢股份有限公司技术中心,辽宁抚顺113001

出　　处：《模具制造》2018年第7期85-87,共3页Die & Mould Manufacture

摘　　要：对塑料模具钢4Cr13在调质过程中产生炸裂的原因进行了分析和讨论,利用金相显微镜和硬度计测试了4Cr13淬火和回火过程中的马氏体组织转变及硬度变化。结果表明,4Cr13的产生炸裂原因主要是淬火过程中马氏体组织转变的不完全,组织中存在较多的残余奥氏体,导致钢材在回火冷却过程中发生了残余奥氏体向马氏体的转变;而且,回火后矫直产生的应力促使马氏体的转变,使组织应力大量的增加,超过钢材的断裂强度,导致钢材断裂。同时,提出了相应的改进措施,以减少和消除产生的内应力,避免炸裂的发生。In this paper, the cracking reason and improvement measures ofplastic mold 4Cr13 steel were discussed and analyzed. The martensite transformation and hardness ofquenching and tempering process of 4Cr13 steel were tested by metallographic microscope andhardness tester. The result show that, incomplete martensite microstructure transformation in thequenching processwasthemain crack reason of 4Cr13 steel, more retained austenite was exist inthe microstructure, thatleaded to the retained austenite transform to martensite; In addition, thestress induced by backfiring caused martensite transformation, the stress of microstructureincreased greatly, what exceeded the fracture strength of steel, that caused the crack. At thesame time, the improvement measures were put forward to reduce and eliminate the internalstress and avoid the occurrence of crack.

关 键 词：4Cr13 调质 应力 残余奥氏体 炸裂 

分 类 号：TG142[一般工业技术—材料科学与工程] TG659[金属学及工艺—金属材料]