摘要
超高强度钢的开发和应用是汽车轻量化和提高安全性的重要途径,1500 MPa及更高强度的高性能热成形钢的开发和应用是关键,超高强度热成形钢及热冲压零件的氢脆风险必须要重视并且避免。介绍了氢脆现象的发现、氢脆的概念、氢脆的机理,并试图用氢致局部塑性增加及晶界脱聚相结合的机制来解释热成形钢的氢脆开裂现象,进而综述了抑制氢脆的方法和采用铌微合金化抑制氢脆的试验结果,并根据氢增强局部塑形(HELP)和氢强化脱聚效应(HEDE)的耦合氢致延迟断裂机制说明了铌微合金化提升氢致延迟断裂抗力的原因。
The development and application of ultra-high strength steel is the main approach to reduce the weight and improve the safety of automobile.The development and application of high-performance hot-formed steel with strength of 1500 MPa and above is the key.However,the risk of hydrogen embrittlement of hot-formed steel and hot-stamped components of ultra-high strength steel must be taken seriously and avoided.This paper introduces the discovery,the concept and the mechanism of hydrogen embrittlement,and proposes the coupling mechanism of hydrogen induced local plasticity and crystal boundary debonding to explain the phenomenon of hydrogen embrittlement cracking of hot-formed steel,and then summarizes the methods of restraining hydrogen embrittlement and the test results of hydrogen embrittlement suppression by niobium microalloying.The cause of improvement of hydrogen-induced delayed fracture resistance by niobium microalloying is explained according to the coupling hydrogen-induced delayed fracture mechanism of Hydrogen Enhancement Local Plasticity(HELP)and Hydrogen Enhancement Debonding Effect(HEDE).
作者
马鸣图
刘邦佑
陈翊昇
路洪洲
Ma Mingtu;Liu Bangyou;Chen YiSheng;Lu Hongzhou(China Automotive Engineering Research Institute Co.,Ltd,Chongqing 401122;The University of Sydney,Sydney,2006;CITIC Metal Co.,Ltd,Beijing 100004)
出处
《汽车工艺与材料》
2021年第4期1-11,共11页
Automobile Technology & Material
基金
国家自然科学基金资助(U1764252)。
关键词
热成形钢
氢致延迟断裂
氢脆机理
铌微合金化
Press-formed steel
Hydrogen-induced delayed fracture
Hydrogen embrittlement
Niobium microalloying
