高强度悬架弹簧钢丝的组织结构  

Microstructure of high strength suspension spring steel wire

作　　者：袁宏梅 王军艺[2] 刘新宽[1] 刘平[1] 

机构地区：[1]上海理工大学材料科学与工程学院,上海200093 [2]宝钢研究院,上海201900

出　　处：《金属热处理》2018年第2期106-110,共5页Heat Treatment of Metals

摘　　要：以某公司的两种不同工艺生产的55SiCr弹簧钢丝为研究材料,其中一种生产工艺条件下,材料曾发生自发断裂,利用偏光显微镜、扫描电镜、透射电镜等进行组织结构研究与分析,结合显微硬度分析,探究组织结构对材料性能的影响。经过对比分析,晶粒越大,碳化物析出多为片状碳化物,且位错较少,材料发生脆性断裂倾向性越高。热处理工艺不当,材料热应力增加,组织异常,材料内应力增加,而当回火不充分,内应力不能完全消除,在存放过程中,内应力不能释放,造成弹簧钢发生自发断裂。Due to one spring made of 55SiCr steel ever ruptured spontaneously under production condition. 55SiCr spring steel wire wasstudied with two kinds of production process. The microstructure and the relationship between structure and properties were investigated bymean of polarizing microscope, scanning electronic microscopy, transmission electronic microscopy and so on. Experimental results show thatthe bigger grains, the more flaky carbides and lesser dislocation, and the higher the brittle fracture tendency of the material is. The improperheat treatment leads to increase of thermal stress. But when the tempering is not sufficient, the stress can not be eliminated completely in theprocess of storage and spontaneous break of the steel wires occurs.

关 键 词：高强度弹簧钢丝 组织结构 热处理 

分 类 号：TG115.213.1[金属学及工艺—物理冶金]