Constitutive analysis and optimization on hot working parameters of as-cast high Cr ultra-super-critical rotor steel with columnar grains

作     者：Zong-ye Ding Di Zhang Qiao-dan Hu Long Zeng Jian-guo Li 

作者机构：School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Key Laboratory of Materials Laser Processing and ModificationShanghai Jiao Tong UniversityShanghai 200240China 

出 版 物：《Journal of Iron and Steel Research International》 (国际钢铁研究杂志)

年 卷 期：2017年第24卷第9期

页      面：916-924页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：sponsored by Major State Basic Research Development Program of China(No.2011CB012900) National Natural Science Foundation of China(No.51374144) 

主　　题：As cast ultra super critical rotor steel Columnar grain Dynamic recrystallization Modified constitutive equation Processing map 

摘      要：Isothermal hot compression tests on the as-cast high-Cr ultra-super-critical rotor steel with columnar grains were carried out in the temperature range from 1223 to 1523Kand at strain rates from 0.001 to 1s^（-1）.The compression direction was parallel to the longitudinal direction of columnar *** constitutive equation based on Arrhenius model was presented,and the processing maps based on the dynamic material model were developed,correlating with microstructure *** main softening mechanism was dynamic recovery at 1223 Kunder strain rates from 0.1to 1s^（-1）,whereas it was dynamic recrystallization under other deformation *** constitutive equation modified by strain compensation reasonably predicted the flow *** processing maps and microstructure evolution mechanism schematic indicated that the optimum hot working parameters lay in the zone defined by the temperature range from 1423 to 1473Kand the strain rate range from 0.001 to 1s^（-1）.