50CrVA钢板簧淬火开裂原因分析  

Analysis on quenching cracks of 50CrVA steel leaf spring

作　　者：张丽伟[1] 刘素芬[1] 王凡[1] 任香玉[1] 张志伟[1] 温铁丽[1] 赵豫东[1] 

机构地区：[1]中国兵器科学研究院包头分院,内蒙古包头014030

出　　处：《金属热处理》2015年第12期201-203,共3页Heat Treatment of Metals

摘　　要：一种汽车板簧以热轧态的50CrVA弹簧钢为原料,经锻造（1030±20）℃×（30~40min）→900℃加热预处理→（860±20）℃淬火→485℃回火热处理后,产生淬火裂纹,对其产生原因进行了分析。结果表明,50CrVA钢热处理后组织中出现混晶、带状偏析等缺陷是淬火裂纹产生的主要原因;900℃预处理保温40 min有利于减少缺陷,避免产生淬火裂纹。A automobile leaf spring using hot rolled 50 CrVA spring steel as raw material forged at（1030 ±20）℃ for 30-40 min,pre-heated at 900℃,quenched at（860 ±20）℃ and tempered at 485℃,that appeared crack after heat treatment.The reasons of quenching cracks were analyzed.The results show that mixed grain,banded segregation after heat treatment are the main reasons of the quenching cracks.Preheating at 900℃ for 40 min that is of benefit to reducing defects and avoiding quenching cracks.

关 键 词：50CrVA钢 板簧 淬火裂纹 混晶 带状偏析 

分 类 号：TG157[金属学及工艺—热处理]