35MnBH钢链轨节表面开裂原因  

Causes of surface cracking of 35MnBH steel chain rail joint

作　　者：邱容容 QIU Rongrong(Technical Centre,Fujian Sangang(Group)Co.,Ltd.,Sanming 365000,China)

机构地区：[1]福建省三钢(集团)有限责任公司技术中心,三明365000

出　　处：《理化检验（物理分册）》2024年第8期49-52,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：圆钢35MnBH经锻打、热处理加工成链轨节后表面出现开裂现象,采用宏观观察、化学成分分析、金相检验、淬透性测试等方法对表面开裂原因进行分析。结果表明:链轨节表面裂纹为淬火裂纹,加热工艺不当是产生淬火裂纹的主要原因。The surface of 35MnBH round steel cracked after forging and heat treatment.The causes of surface cracking were analyzed by means of macroscopic observation,chemical composition analysis,metallographic examination and hardenability test.The results show that the surface crack of the chain rail joint was a quenching crack,and the improper heating process was the main reason for the quenching crack.

关 键 词：35MnBH钢 表面开裂 淬火裂纹 奥氏体晶粒度 淬透性测试 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]