Hot deformation behavior of 2Cr12NiMo1W1V heat resistant steel used for supercritical steam turbine blades
GONG Zhi-hua1，2， HE Zhen3， BAO Han-sheng1， YANG Gang1
（1. Institute of Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China； 2. School of Materials and Metallurgy， Inner Mongolia University of Science and Technology， Baotou 014010，
Nei Mongol， China； 3. Institute for Science and Technology Information and Strategy，
Central Iron and Steel Research Institute， Beijing 100081， China）
Abstract：In order to solve the problem of coarse grain and microstructure uniformity of 2Cr12NiMo1W1V heat resistant steel during forging process，the hot deformation characteristics and dynamic recrystallization behavior at the temperature range of 1 000-1 200 ℃ and strain rate range of 0.01-10 s－1 under 70% deformation were investigated by means of hot compression tests with Gleeble-3800. The results show that the true stress-strain curve of the alloy has dynamic recrystallization characteristics. The recrystallized grain size increases with the increase of deformation temperatures or the decrease of deformation rates. The grains grow fast when deform at 0.01 s－1 with temperature range of 1 150-1 200 ℃. The constitutive equation is established on basis of the true stress-strain curves and the activation energy（Q）was obtained as about 453.74 kJ/mol. The hot working maps are developed based on the peak stress and show variations of the efficiency of power dissipation related to temperature and strain rate. The optimum hot working temperature and strain rate interval are 1 000-1 150 ℃ and 0.1-1 s－1，1 060-1 125 ℃ and 0.1-10 s－1 respectively.
龚志华， 何 禛， 包汉生， 杨 钢. 2Cr12NiMo1W1V超临界汽轮机叶片用耐热钢的热变形行为[J]. 钢铁, 2019, 54(3): 63-68.
GONG Zhi-hua1，2， HE Zhen3， BAO Han-sheng1， YANG Gang1. Hot deformation behavior of 2Cr12NiMo1W1V heat resistant steel used for supercritical steam turbine blades. Iron and Steel, 2019, 54(3): 63-68.
2019, Vol. 54 
