10B21冷镦开裂原因分析

冷镦钢盘条10B21在使用时由于变形较大，容易在表面造成开裂。为了改善10B21盘条的性能，降低冷镦时开裂的概率，采用金相检验、扫描电镜及能谱分析等手段对开裂试样进行了观察和分析。结果表明：10B21开裂处两侧存在脱碳现象，晶粒长大趋势明显。主要是原材料表面存在线状缺陷所致，而缺陷周围组织正常，也未见到大颗粒夹杂，对此提出了改进措施。

Analysis of cracking on cold heading steel 10B21

Cold heading steel wire rod 10B21 is easy to crack on the surface due to its large deformation. In order to improve the performance of 10B21 wire rod and reduce the probability of cracking during cold heading， the cracking specimens were observed and analyzed by means of metallographic examination， scanning electron microscope and energy spectrum analysis. The results show that decarburization exists on both sides of 10B21 cracking and the grain growth trend is obvious. Mainly due to the existence of linear defects on the surface of the raw material， and the defects around the normal organization， but also did not see large particles of inclusion， and put forward improvement measures.