Effects of Austenite Stabilization on the Onset of Martensite Transformation in T91 Steel  

作　　者：Baoqun NING Yongchang LIU Qingzhi SHI Zhiming GAO Liushuan YANG 

机构地区：[1]College of Materials Science and Engineering, Tianjin University, Tianjin 300072, China [2]School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300191, China [3]Pingdingshan Institute of Technology, Pingdingshan 467001, China

出　　处：《Journal of Materials Science & Technology》2008年第2期202-206,共5页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(No.50401003);the Foundation for the Author of National Excellent Doctoral Dissertation of China(FANEDD)of China(No.200335);the Natural Science Foundation of Tianjin City(No.033608811);the Fok Ying Tong Education Foundation,and the Program for New Century Excellent Talents in University for grant and financial support.

摘　　要：The influences of thermal stabilization of austenitic on the onset temperature for a martensite transformation in T91 ferritic heat-resistant steel were studied by high-resolution differential dilatometer. The phase transformation kinetic information was obtained by adopting lever rule from the recorded dilatometric curves. The results show that an inverse stabilization, featured by the damage of ＂the atmosphere of carbon atoms＂ and the increase of the starting temperature for martensite transformation takes place when the T91 ferritic steel is isothermally treated above the Ms point, and it becomes strong with increasing the holding time. While the continued temperature for martensite transformation decreases gradually when isothermally holding at a temperature below Ms point. The observed inverse stabilization behavior could be attributed to the relatively high temperature of Ms point in the explored T91 ferritic heat-resistant steel.The influences of thermal stabilization of austenitic on the onset temperature for a martensite transformation in T91 ferritic heat-resistant steel were studied by high-resolution differential dilatometer. The phase transformation kinetic information was obtained by adopting lever rule from the recorded dilatometric curves. The results show that an inverse stabilization, featured by the damage of ＂the atmosphere of carbon atoms＂ and the increase of the starting temperature for martensite transformation takes place when the T91 ferritic steel is isothermally treated above the Ms point, and it becomes strong with increasing the holding time. While the continued temperature for martensite transformation decreases gradually when isothermally holding at a temperature below Ms point. The observed inverse stabilization behavior could be attributed to the relatively high temperature of Ms point in the explored T91 ferritic heat-resistant steel.

关 键 词：T91 ferritic heat-resistant steel Austenitic thermal stabilization MARTENSITE MICROSTRUCTURE 

分 类 号：TF7[冶金工程—钢铁冶金]