ZHONG Ping1, ZHANG Yeqin1, ZHONG Jinyan2, LIU Mutong1, XIAO Kui3
1. AVIC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：A highly alloyed ultra-high strength stainless steel S280 has been in use for many years. After quenching and aging, the microstructure of S280 is composed of highly dislocated lath martensite and some carbides which strengthen the alloy. The steel enjoys excellent combined mechanical properties, the typical mechanical property values are as follows: the ultimate strength of 1920 to 1930 MPa, the plane fracture toughness KIC of 95 to 100 MPa √m. The corrosion resistance of the new ultra-high strength steel S280 is much better than that of AerMet100 and 300M in the NaCl solution. The steel S280 can meet the requirements of aerospace applications, and be widely used for the high strength parts with corrosion resistance.
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2015, Vol. 33 
