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《Journal of Shanghai Jiaotong University》 2000-12
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Effect of Spray Forming and Aging Treatment on Cr_(12)MoV Steel

XU Han bing 1, TANG Liang 1, WU Jian sheng 1, ZHANG Jing guo 2 (1.Open Lab. of the Ministry of Education for High Temperature Materials and Testing, Shanghai Jiaotong Univ., Shanghai 200030, China; 2.Shanghai Iron & Steel Research Institute  
Cr 12 MoV steel was chosen as the spray formed material. Microstructure and property of the as sprayed steel were investigated by the optical metallography, X ray diffraction analysis, difference thermal analysis etc.. The results show that the as sprayed steel shows a considerate refinement of microstructure. Different from the as cast Cr 12 MoV steel, the as sprayed steel mainly consists of a highly supersaturated austenite due to the high solidification rate. The lattice parameter of austenite is 0.362 0 nm. The martensite start temperature of the as sprayed steel is lower than that of the conventional processed steel. The metastable austenite transformes gradually with the increase of aging temperature. The peak aging occurs at 570°C with a hardness of HRC 60, which is larger than the hardness HRC38 of the as sprayed steel. The aged steel mainly consists of martensite. Subsequently, with the increase of the aging temperature, the hardness of Cr 12 MoV steel decreases rapidly. The critical aging temperature of the as sprayed Cr 12 MoV steel is 570°C.
【Fund】: 上海市新材料中心资助项目! (97JC14 0 0 8)
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