What is the most reliable interfacial energy of FCC/HCP at around 300 K in high Mn austenitic steels? or if there is a paper clearly showing chemical composition dependence of that, please tell me.
Dear Mr Koyama,
I guess, you mean the interfacial energy of coherent gamma-Austenite/epsilon-martensite interfaces, i.e. with (111)/(0001) habit planes, that are part of the thermodynamic description of epsilon-martensite according to Olson and Cohen (1976/1986) . I am strongly convinced that it is in the range 1 mJ/m2 or even lower. The problem is that actually interfacial energies do not exist in the way as it is described by Olson and Cohen, because roughly speeking this description accounts for the gamma/epsilon interfacial energy of an intrinsic stacking fault twice. The most important value for the desciption of intrinsic stacking faults as well as epsilon-martensite is Delta G (gamma-epsilon).
I kindly invite you to download (free author copy) our publication on this purpose under:
http://www.tandfonline.com/eprint/28bwsbWJsXkZNaxRx7Y9/full
With best regards
David Geißler
Dear Mr Geissler
Thank you for the clear answer. In fact the interfacial energy has been an important issue to thermodynamically calculate stacking fault energy. But the value is set as fitting parameter in most cases. Your answer and work are more theoretical and convincing. I greatly appreciate you.
Motomichi
Control enhance temperature then fast quench .determine heat treatment temperature define thin film or bulk material defined and experiment.
control impurity specially activation and sizes ingredient
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