扳头断裂原因  

Reason for the fracture of the wrench

作　　者：赵学谦 牛铭越 胡寒婷 毛宽亮 王博 ZHAO Xueqian;NIU Mingyue;HU Hanting;MAO Kuanliang;WANG Bo(CITIC Heavy Industries Co.,Ltd.,Luoyang 471000,China;State key Laboratory of Intelligent Mining Heavy Equipment,Luoyang 471000,China)

机构地区：[1]中信重工机械股份有限公司,洛阳471000 [2]智能矿山重型装备全国重点实验室,洛阳471000

出　　处：《理化检验(物理分册)》2025年第4期79-81,共3页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某扳头在使用过程中发生断裂。采用宏观观察、化学成分分析、金相检验、扫描电镜分析、硬度测试等方法分析了扳头断裂的原因。结果表明:扳头的热处理工艺控制不当,导致材料硬度较高,组织中出现马氏体,材料的氢脆敏感性增强,最终导致扳头发生氢致脆性断裂。The wrench broke during use.The reasons for the fracture of the wrench were analyzed using macroscopic observation,chemical composition analysis,metallographic examination,scanning electron microscopy analysis,hardness testing.The results show that improper control of the heat treatment process for the wrench resulted in high material hardness,martensite formation in the microstructure,the hydrogen embrittlement sensitivity of the material increased,and ultimately led to hydrogen induced brittle fracture of the wrench.

关 键 词：扳头 氢致脆性断裂 沿晶开裂 回火温度 马氏体 

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]