军用H62黄铜罐开裂原因  

Cause of Cracking on H62 Military Brass Tank

作　　者：徐幸 徐斌 王嵩蒲 尉成栋 于玲君 XU Xing;XU Bin;WANG Songpu;WEI Chengdong;YU Lingjun(Hangzhou Oxygen Plant Group Co.,Ltd.,HangZhou 310000,China)

机构地区：[1]杭州制氧机集团股份有限公司,杭州310000

出　　处：《理化检验（物理分册）》2021年第5期59-61,65,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某工厂生产的军用H62黄铜罐在水压试验后入库存放,一段时间后出现开裂现象。通过化学成分分析、金相检验、硬度测试、扫描电镜分析和能谱分析等方法,结合生产工艺和现场工况,对该黄铜罐的开裂原因进行了分析。结果表明:黄铜罐在机械打孔及焊接后未进行退火处理,导致焊缝部位产生应力集中,之后的水压试验提供了潮湿环境,引起显微组织中的β相脱锌,导致黄铜力学性能下降,最终发生应力腐蚀开裂。The military H62 brass tanks produced by a factory were put into storage after hydrostatic test, and cracked after a period of time. The causes of cracking on brass tank were analyzed by means of chemical composition analysis, metallographic examination, hardness test, scanning electron microscope analysis and energy spectrum analysis, combined with production process and field conditions. The results show that the brass tank was not annealed after mechanical drilling and welding, which led to stress concentration in weld seam. The subsequent hydraulic test provided a humid environment, causing the dezincification of β phase in the microstructure, which led to the decline of mechanical properties of brass, and finally stress corrosion cracking occurred.

关 键 词：H62黄铜 应力腐蚀 脱锌 开裂 应力集中 

分 类 号：TG115[金属学及工艺—物理冶金] TG146.11[金属学及工艺—金属学]