Effect of Stress on Low Temperature Phase Transformation of T91 Ferrite Heat Resistant Steel
NING Baoqun1,LIU Yongchang1,QIAO Zhixia1,YANG Liushuan2
1. College of Materials Science and Engineering, Tianjin University, Tianjin 300072, China；2. Department of Materials Science and Engineering, Pingdingshan Institute of Technology, Pingdingshan 467001, Henan, China
Abstract： The effect of stress applied at certain temperature on low temperature phase transformation of T91 was studied with Baehr DIL805A/D highresolution differential dilatometer. According to the results of dilatometric measurement and microstructure observation, kinetics of phase transformation was obtained. It was found that the stress promotes formation of martensite and increase of Ms; but the stress applied at different temperature exhibits different effect on Ms: with increase of stress,at 760 ℃ and 650 ℃ Ms decreases, whereas at 440 ℃ Ms is constant at first and increases afterwards. The above phenomena could be accounted for the different inherent phase transformation mechanism: the former is controlled by the morphology of the deformed austenite,the latter is influenced by stress induced martensite transformation.
宁保群;刘永长;乔志霞;杨留栓. 应力对T91铁素体耐热钢低温相变过程的影响[J]. 钢铁, 2007, 42(9): 68-0.
NING Baoqun;LIU Yongchang;QIAO Zhixia;YANG Liushuan. Effect of Stress on Low Temperature Phase Transformation of T91 Ferrite Heat Resistant Steel. Iron and Steel, 2007, 42(9): 68-0.
2007, Vol. 42 
