（1. Faculty of Materials Science and Engineering， Kunming University of Science and Technology， Kunming 650093，Yunnan， China 2. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China）
Abstract：In order to study the hot deformation behavior of 9Ni martensite stainless steel，the thermal deformation test for the sampling of 9Ni steel forgings with[?400 mm]large sizes was carried out. The Gleeble-1500 thermal simulator was used to select the engineering strain 60%，the deformation temperature was 950-1 200 ℃，and the strain rate was 0.01-5 s－1. And the true stress-strain curves under different deformation processes were drawn. The constitutive equation of 9Ni steel was constructed by introducing Zener-Hollomon parameters. The relative error of this constitutive equation model was only 0.03%-0.42%，and had good goodness of fit. The energy dissipation diagram of 9Ni steel under different strain was drawn，and the optimum heat processing interval of large forgings of 9Ni steel was established with the microstructure after deformation. The temperature was at 1 100-1 150 ℃，and the strain rate was 0.1-0.3 s－1.
赵宏禹，刘荣佩，王长军，梁剑雄，胡家齐. 9Ni马氏体不锈钢的热变形行为及其能量耗散图[J]. , 2018, 53(9): 74-79.
ZHAO Hong-yu，，LIU Rong-pei，WANG Chang-jun，LIANG Jian-xiong，HU Jia-qi. Hot deformation behavior and energy dissipation diagram of 9Ni martensite stainless steel. Iron and Steel, 2018, 53(9): 74-79.
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2018, Vol. 53 
