摘要
某液压阀门用30CrMnSiNi2A钢制螺栓,在服役过程中出现断裂,通过断口形貌观察、化学成分检测、组织观察和力学性能检测确定了螺栓断裂的原因,并提出了改进措施。结果表明,螺栓热处理过程中的回火温度处于30CrMnSiNi2A钢回火脆性温度区间,并且原材料杂质P元素含量偏高,进一步增加了回火脆性,最终导致螺栓脆性断裂。通过等温淬火代替原淬火+回火工艺,螺栓的回火脆性得到了有效预防。
For a 30CrMnSiNi2A steel bolt used in a hydraulic valve,fracture occurred during service.The cause of the bolt fracture was determined through fracture morphology observation,chemical composition test,microstructure observation and mechanical property test,and improvement measures were proposed.The results show that the tempering temperature during the heat treatment of the bolt is in the tempering brittleness temperature range of the 30CrMnSiNi2A steel,and the high content of raw material impurity P element further increases the tempering brittleness,which ultimately leads to brittle fracture of the bolt.By using isothermal quenching instead of the original quenching+tempering process,the tempering brittleness of bolts is effectively prevented.
作者
程东松
黄浩博
郭军校
张钦莹
孔明旭
郭超越
Cheng Dongsong;Huang Haobo;Guo Junxiao;Zhang Qinying;Kong Mingxu;Guo Chaoyue(Henan Aerospace Precision Machining Co.,Ltd.,Xinyang Henan 464000,China;Henan Key Laboratory of Fastening Connection Technology,Xinyang Henan 464000,China)
出处
《金属热处理》
北大核心
2025年第8期305-308,共4页
Heat Treatment of Metals
