Role of Chemical Driving Force in Martensitic Transformations of High-Purity Fe-Cr-Ni Alloys
Role of Chemical Driving Force in Martensitic Transformations of High-Purity Fe-Cr-Ni Alloys
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DOI：
10.1007/s11661-011-0769-x
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发表时间：
2011-12-01
影响因子：
2.8
通讯作者：
Najafizadeh, A.
中科院分区：
文献类型：
--
作者：
Behjati, P.;Najafizadeh, A.
The main objective of the present work is to point out the respective roles of chemical driving force and stacking fault energy (SFE) in the occurrence of martensitic transformations in high-purity Fe-Cr-Ni alloys. For this purpose, the transmission electron microscope (TEM), X-ray diffractometer, thermal differential microanalyzer (TDA), and tension test were employed to report M-s temperatures, austenite stacking fault energies, and driving forces for the concerned alloys. It was observed that the martensitic transformations in the studied alloys occur through the gamma -> epsilon ->alpha' steps. As a remarkable result, it was shown that a low SFE, if necessary to epsilon-phase nucleation, not a sufficient condition for nucleation of alpha' phase. In fact, the formation of stable alpha' nuclei from alpha' embryos occur if the required chemical driving force is provided. Also, an equation was proposed for the kinetics of spontaneous martensitic transformation as a function of driving force.
