1 Department of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China; 2 Wuxi Parker New Materials Technology Co. Ltd., Wuxi 214161, China
Abstract: The purpose of this paper was to investigate the thermal deformation behavior of 11Cr12Ni3Mo2VN martensite heat-resistant steel and establish the optimal thermal deformation processing parameters of the material. In this paper, 11Cr12Ni3Mo2VN martensite heat-resistant steel was isothermal heat-compressed by Gleeble-3500 thermal simulation tester at the condition of the temperatures ranging from 900 ℃ to 1 050 ℃ and strain rate in the range of 0.001—10 s-1. Established a constitutive equation by fitting the peak stress and verified the accuracy of the constitutive equation. It was found that the established constitutive equation have a high prediction precision on the flow stress of the material. By calculating and analysing of the experimental data, the apparent activation energy (Q) was determined to be 450.988 kJ/mol. Drawn the thermal processing maps based on the dynamic material model and Murthy's instability criterion. The optimal processing parameters of 11Cr12Ni3Mo2VN heat-resistant steel was determine by the thermal processing maps and the stress-strain curves. The specific parameters were as follows: the processing temperature from 980 ℃ to 1 050 ℃ and the strain rate of 1 s-1 or less. The effects of the thermal deformation parameters such as temperature and strain rate on the microstructure evolution of the material were studied through OM.The results show that the temperature and strain rate have a great influence on the generation and degree of dynamic recovery and recrystallization. The processing temperature plays a decisive role in the evolution of the microstructures, the dynamic recovery dominates at low temperatures, and the degree of dynamic recrystallization rose as the temperature increased. In addition,the strain rates have a great influence on the size of dynamically recrystallized grains. The low strain rate is beneficial to the full division of dynamic recrystallization, the grain size is more uniform, and the material has more excellent performance after thermal deformation.
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2020, Vol. 34 
