20Mn螺钉氢脆断裂分析  

Analysis of hydrogen embrittlement fracture of 20Mn screw

作　　者：陈桂丰 李浩 周崎 曹标 Chen Guifeng;Li Hao;Zhou Qi;Cao Biao(Guangzhou Customs Technical Center,Guangzhou 510623,China)

机构地区：[1]广州海关技术中心,广东广州510623

出　　处：《金属制品》2021年第3期50-53,共4页Metal Products

基　　金：高新技术消费品关键部件检测及寿命预测技术研究(2017YFF0210002);跨境可再生资源寿命预测方法研究(2018YFF0215502)。

摘　　要：利用化学成分分析、断口宏观和微观观察、显微组织检验、渗碳层深度测定、氢含量检测等方法,对断裂螺钉与无质量问题螺钉进行分析比较。结果表明,螺钉断裂符合氢脆的延迟断裂、沿晶断裂的特征,为氢致断裂,不良品含氢量较高及硬度值偏大增加了氢脆敏感性。By means of chemical composition analysis,fracture macroscopical and microscopical observation,microstructure inspection,carburizing layer depth measurement and hydrogen content detection,the fractured screws and screws without quality problems were analyzed and compared.The results show that screw fracture is characterized by delayed fracture,high hydrogen content and intergranular fracture,which is hydrogen embrittlement fracture.The high hydrogen content and high hardness of defective products increase sensitivity of hydrogen embrittlement.

关 键 词：螺钉 电镀 表面渗碳 显微组织 化学成分 氢致断裂 

分 类 号：TG157[金属学及工艺—热处理]