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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 toughening mechanism of Cr-Ni-Co-Mo high strength martensitic stainless steel developed by our country was studied. The results show that the aging strength of this steel reaches up to 1 940 MPa and KIC = 141 MPa.m at 535 ℃. At this time, the large amount of dispersed and small Fe2Mo Laves phase precipitated in the steel is the main reason for maintaining ultra-high strength. Of the martensite lath sector has a small amount of retained austenite steel with higher toughness. The steel has excellent overall performance, is particularly suitable for manufacturing a new generation of high strength, high toughness, bearing capacity of the marine environment corrosion structure, and potential applications in aerospace and aviation prospects.