摘要
研究了由我国自行研制的Cr-Ni-Co-Mo系高强度马氏体时效不锈钢的强韧化机理。结果表明,该钢在535℃时效强度可达1 940 MPa,KIC=141 MPa.m,此时钢中析出的大量、弥散、细小的Fe2Mo型Laves相是保持超高强度的主要原因;在纤细的马氏体板条界上有少量的残余奥氏体使钢具有较高的韧性。该钢具有优良的综合性能,特别适合于制造新一代高强高韧、承力的耐海洋环境腐蚀结构件,并在航天及航空领域潜在着应用前景。
The strengthening-toughening mechanism of an domestic-produced Cr-Co-Ni-Mo ultra-high strength maraging stainless steel was studied. The results show that after aging at 535 ℃ for 4 h the strength of the steel may reach 1 940 MPa, and KIC can reach 141 MPa · √m, large amount of precipitates are found in the martensite, the precipitates are very fine and dispersedly distributed in the matrix, which greatly enhances the strength of the steel, and the residual austenites between martensitic laths improve the toughness of the steel. The steel is especially suited to making a new generation of structural member with high strength and high toughness, which can be used in strained marine environment, and it can be used in the aerospace field.
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2008年第5期27-32,共6页
Journal of Iron and Steel Research
基金
国家高技术研究发展计划(863)资助项目
关键词
马氏体时效不锈钢
强韧化机理
析出相
maraging stainless steel
strengthening-toughening mechanism
precipitation phase
