摘要
针对1700 MPa级新型超高强度钢大规格盲孔锻件局部出现的探伤缺陷问题,采用横截面酸浸试验、热处理后力学性能试验、断口及裂纹面观察等手段进行综合分析,鉴定缺陷为氢致裂纹(白点),并详细分析了其可能产生的工艺环节,对此提出了提高渣料烘烤温度和时间、延长扩氢退火时间、加强心部锻透性等改进措施。
Cross section pickling,mechanical property tests after heat treatment,fracture and crack surface observation and other test methods were employed to comprehensively analyze the local ultrasonic flaw detection defects of a largesize blind hole forging of a 1700 MPa new ultra-high strength steel.The defects were identified as hydrogen-induced cracking(white spots).The possible generation process was analyzed in detail.The corresponding improvement measures,such as enhancing slag baking temperature and time,increasing hydrogen diffusion annealing time,improving forging ratio and the forging penetration efficiency of the core part,were proposed.
作者
宁静
田兆富
谢金鹏
苏杰
NING Jing;TIAN Zhao-fu;XIE Jin-peng;SU Jie(Institute for Special Steels,Central Iron and Steel Research Institute,Beijing 100081,China;NORINCO Group Air Ammunition Research Institute,Harbin 150030,China;Failure Analysis Center,Central Iron and Steel Research Institute,Beijing 100081,China)
出处
《物理测试》
CAS
2020年第6期53-56,共4页
Physics Examination and Testing
关键词
超高强度钢
大尺寸锻件
超声波探伤
白点
氢致裂纹
ultra-high strength steel
large-size forging
ultrasonic flaw detection
white spot
hydrogen-induced crack