![]() As it happens, while the austenite-to-martensite transformation that occurs in the Fe-C system obviously is a martensitic transformation, it is crystallographically complex and exhibits certain rather special characteristics. In particular, it is important to avoid any confusion with the austenite and martensite phases that form in steels. It is important to be clear that this terminology is generic – i.e., these phases are not any specific ones, but refer to a type of phase. Sometimes, the austenitic phase is termed the “ parent” phase. For superelastic and shape memory alloys, the two phases are normally termed “ austenite” (stable at higher temperatures) and “ martensitic” phase (stable at lower temperatures). The animation below shows the stability of two phases as a function of temperature. The quantity of primary concern here is the Gibbs free energy, G. Some simple features of the thermodynamics relevant to phase transformations are given here - see Ellingham Diagram TLP. Previous Next Martensitic Phase Transformations - Basic Thermodynamics
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