40Cr圆钢热顶锻开裂原因  

Causes of hot upset forging cracking of 40Cr round steel

作　　者：王妍 WANG Yan(Tianjin Aerospace Long March Technical Equipment Co.,Ltd.,Tianjin 300301,China)

机构地区：[1]天津航天长征技术装备有限公司,天津300301

出　　处：《理化检验（物理分册）》2024年第4期54-56,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某40Cr圆钢热顶锻发生开裂现象,采用宏观观察、化学成分分析、扫描电镜分析、金相检验等方法对材料开裂原因进行分析。结果表明:40Cr圆钢裂纹缺陷处显微组织正常,组织中的非金属夹杂物成分含量符合产品标准要求;顶锻母材上的缺陷是由圆钢在轧制过程中出现的表面划伤导致的。最后提出了改进方法,以避免该类问题再次发生。Cracking occurred in hot upset forging of a 40Cr round steel.The causes of cracking were analyzed by means of macroscopic observation,chemical composition analysis,scanning electron microscope analysis and metallographic examination.The results show that the microstructure of 40Cr round steel crack defect was normal,and the content of non-metallic inclusions in the structure met the requirements of product standards.The defects on the upset forging base metal were caused by the surface scratches of the round steel during the rolling process.Finally,an improved method was proposed to avoid the recurrence of such problems.

关 键 词：40Cr圆钢 热顶锻 轧制缺陷 划伤 显微组织 

分 类 号：TG115.2[金属学及工艺—物理冶金] TB31[金属学及工艺—金属学]