航空用新型超高强度钢16NiCo

A New Ultra-HighStrength Steel 16NiCo for Aerospace Application

１６ＮｉＣｏ是可焊接超高强度钢，主要成分是０．１６Ｃ－２Ｃｒ－１０Ｎｉ－１Ｍｏ－１４Ｃｏ。靠二次硬化获得所需强度。使用状态下的基体组织为板条马氏体，主要强化相是沿位错线分布的Ｍ＿２Ｃ。力学性能的典型值为抗拉强度σ＿ｂ１７４０ＭＰａ，断裂韧度Ｋ＿（ＩＣ）值为１５３ＭＰａ，Ｋ＿（ＩＳＣＣ）值为８２ＭＰａ。工艺性能良好，可用于制造受力接头、平尾大轴、着陆钩和起落架零件。

highly alloyed secondary hardening steel 16NiCo has been studying for more than three years.The optimum alloy compeition of the steel should be 0.16C-2Cr-10Ni-1Mo-14Co. After quenching and ag-ing,the microstructure is composed of highly dislocated lath martensite,a small amounts of interlath re-tained austenite and twinnig,and some carbides which strengthening the alloy. This stecl possessed excellent combined mechanical properties,the typical mechanical values are as follows:the ultimate strength of1740MPa,the plane fracture toughness K_(IC) of 153MPa and and the K_(ISCC) of 82MPa. 16NiCo met the requirements of aerospace application,and could be widely used to manufacture the critieal joints,horizontal stabilator shaft,arresting hooks and carrier-based aircraft landing gears,etc.