Kinetics of orthorhombic martensite decomposition in TC21 alloy under isothermal conditions

被引:0
作者
Bin Tang
Hong-Chao Kou
Yi-Hong Wang
Zhi-Shou Zhu
Feng-Shou Zhang
Jin-Shan Li
机构
[1] Northwestern Polytechnical University,State Key Laboratory of Solidification Processing
[2] Beijing Institute of Aeronautical Materials,undefined
[3] Western Superconducting Technologies Co. Ltd.,undefined
来源
Journal of Materials Science | 2012年 / 47卷
关键词
Martensite; Aging Temperature; Dilatometry; TC21 Alloy; Transform Volume Fraction;
D O I
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中图分类号
学科分类号
摘要
The kinetics of martensite decomposition in TC21 alloy was investigated at isothermal conditions in the temperature range 500–850 °C. The dilatometry technique was utilized to trace the transformation process for different aging temperatures. Within the framework of the Avrami theory, the analysis of the experimental data was made by means of the Johnson–Mehl–Avrami (JMA) equation. A very good correspondence between the calculated and the experimental results was found. The JMA kinetic parameters obtained from different aging temperatures implied different mechanisms of the transformation. The α″ phase transforms to α + α″ (rich) at 500 °C and the transformation is incomplete. Further increase of the temperature to 800 and 850 °C results in directly transformation α″ →α + β. The mechanism of the transformation alters during the course of the transformation for 550, 600, 650, 700, and 750 °C. Moreover, The TTT diagram was constructed for the martensite decomposition in TC21 alloy based on the dilatometry analysis and JMA theory, respectively. Good agreement between experimental and calculated TTT diagram is observed.
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页码:521 / 529
页数:8
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