Phase transformation behavior of Grade 91 ferritic steel

被引:19
|
作者
Tokunaga, T. [1 ]
Hasegawa, K. [2 ]
Masuyama, F. [1 ]
机构
[1] Kyushu Inst Technol, Dept Appl Sci Integrated Syst Engn, Kitakyushu, Fukuoka 8048550, Japan
[2] Kyushu Inst Technol, Undergrad Sch, Kitakyushu, Fukuoka 8048550, Japan
来源
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 510-11卷
关键词
Phase transformation; Ferritic steels; Differential thermal analysis; Magnetic transition; AUSTENITE GRAIN-GROWTH;
D O I
10.1016/j.msea.2008.05.059
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The phase transformation behavior of Grade 91 steel, which is an advanced ferritic steel, has been investigated using differential thermal analysis (DTA). In our DTA experiments, disk-shaped samples were normalized at 1080 degrees C, and then tempered at temperatures between +10 degrees C and -40 degrees C of the ferrite to austenite transformation temperature (A(c1) temperature) determined during normalizing, at a heating and cooling rate of 30 degrees C/min. The DTA curves on heating during normalizing showed that a magnetic transition and the A(c1) transformation temperatures occurred at 744 degrees C and 847 degrees C, respectively. Two overlapping exothermic peaks were observed in the temperature range 770-700 degrees C in the DTA cooling curves after tempering at temperatures between +10 degrees C and -30 degrees C from the A(c1) temperature. A partial austenitization seemed to have occurred, even when holding the tempering temperature below the A(c1) temperature and, thus, the high temperature peak was due to the austenite to ferrite transformation. The low temperature peak corresponded to a magnetic transition. The formation of ferrite during cooling after tempering can be considered to arise from the heat evolved from the magnetic transition, which influences the localized cooling of the sample near the Curie temperature. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:158 / 161
页数:4
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