。1208· 北京科技大学学报 第29卷 in hot axisymmetric com pression tests.Nat ional Physics Labora- [18 McQueen H J.Yue S.Ryan N D.Constitutive analysis in hot toy,2002 working.Mater Sci Eng A.2002,322(1/2):43 【1g Davenport S B.Silk N J.Sellars C M.Development of constitu- 【19曹金荣，刘正东，程世长，等.应变速率和变形温度对T122 tive equations for modeling of ho mlling.Mater Sci Technol. 耐热钢流变应力和临界动态再结品行为的影响。金属学报， 2000.16(5):539 2007,431):35 [17 McQueen H J.Yue S,Ryan N D.et al.Hot working charac- 20 Raj R.Devebpment of a prooessing map for use in warm-fom- teristics of steels in Austenitic state.J Mater Process Technol. ing and hot-foming pmcesses.Metall Trans 1981,12A(6): 1995.531/2):293 1089 Processing maps and hot formability of T122 heat resistant steel CAO Jinrong.LIU Zhengdong,CHENG Shichang?,YANG Gang2,XIEJianxin 1)Material Science and Engineering School,University of Science and Technology Beijing.Beijng 100083.China 2)Central Iron and Steel Research Institute.Beijing 100081.China ABSTRACT Based on the dynamic materials model theories,hyperbolic sine equation and two Liapunov stabili- ty criteria,the processing maps of T122 heat resistant steel were constructed using the data obtained from isothermal hot compress tests by means of a Gleeble 3500 simulator.The hot formability of the T122 steel was studied and its relations with microstructure at various temperatures and strain rates were analyzed using the pro- cess maps.The result shows that the efficiency of power dissipation increases with the increase in temperature and the decrease in strain rate.The T122 steel exhibited dynamic recrystallization with a peak power dissipation efficiency of 0.2 occurring at the temperature upw ards 1085 Cand the strain rate less than 0.37s.The tem- perature of 1085-1150 Cand the strain rate more than 0 13s are recommended to set the industrial forming conditions. KEY WORDS T122 heat resistant steel;hot compress test;processing maps;fomabilityin hot axisymmetric com pression tests.National Physics Labora￾t ory, 2002 [ 16] Davenport S B, Silk N J, S ellars C M .Development of constitu￾tive equations for modeling of hot rolling.Mater Sci Technol, 2000, 16( 5) :539 [ 17] McQueen H J, Yue S, Ryan N D, et al.Hot w orking charac￾t eristics of steels in Aust enitic state.J Mater Process Technol, 1995, 53( 1/ 2) :293 [ 18] McQueen H J, Yue S, Ryan N D.Constitu tive analysis in hot working .Mater Sci Eng A, 2002, 322( 1/ 2) :43 [ 19] 曹金荣, 刘正东, 程世长, 等.应变速率和变形温度对 T 122 耐热钢流变应力和临界动态再结晶行为的影响.金属学报, 2007, 43( 1) :35 [ 20] Raj R.Development of a processing map f or use in warm-f orm￾ing and hot-f orming p rocesses.Metall Trans, 1981, 12A( 6 ) : 1089 Processing maps and hot formability of T122 heat resistant steel CAO Jinrong 1, 2) , LIU Zhengdong 2) , CHENG Shichang 2) , Y ANG Gang 2) , XIE Jianxin 1) 1) Material Science and Engineering School, Universit y of Science and Technology Beijing, Beijing 100083, China 2) Central Iron and S teel Research Institu te, Beijing 100081, C hina ABSTRACT Based on the dynamic materials model theories, hyperbolic sine equation and two Liapunov stabili￾ty criteria, the processing maps of T122 heat resistant steel w ere constructed using the data obtained from isothermal ho t compress tests by means of a Gleeble 3 500 simulator .The hot formability of the T122 steel was studied and its relations w ith microstructure at various temperatures and strain rates were analyzed using the pro￾cess maps .The result show s that the efficiency of power dissipation increases w ith the increase in temperature and the decrease in strain rate .The T122 steel exhibited dynamic recrystallization w ith a peak power dissipation efficiency of 0.2 occurring at the temperature upw ards 1 085 ℃and the strain rate less than 0.37s -1 .The tem￾perature of 1085 ～ 1 150 ℃and the strain rate mo re than 0.13 s -1 are recommended to set the industrial fo rming conditions. KEY WORDS T122 heat resistant steel;ho t compress test ;processing maps ;fo rmability · 1208 · 北 京 科 技 大 学 学 报 第 29 卷