Isothermal and athermal martensitic transformations

Effect of Mo on the magnetic properties of martensitic phase in Fe–Ni–Mo alloys

“…According to the reported results, athermal martensitic transformations show only one crystallographic and morphological feature and ␣ -martensite forms in Fe-24Ni-5Mo alloy. Georgiyeva and Nikitina [12] also showed that martensitic transformation in Fe-24Ni-5Mo develops below the room temperature in two different ways; in the range ∼[−50 • C to −150 • C] it responds to the rate of cooling and can take place under isothermal condi- tions like the transformation in some other Fe-based alloys such as Fe-Ni-Mn, however at −185 • C the kinetics of the process suddenly goes over to typically athermal. TEM observations revealed that in the examined Fe-30% Ni-x% Mo alloys the austenite matrix transforms to ␣ -martensite.…”

New observations on the formation of athermal martensite in Fe–Ni–Mo alloys

“…According to the reported results, athermal martensitic transformations show only one crystallographic and morphological feature and ␣ -martensite forms in Fe-24%Ni-5%Mo alloy. Georgiyeva et al [3] also showed that a martensitic transformation in Fe-24%Ni-5%Mo develops at below room temperature in two different ways: In the range ∼[−50 to −150 • C)], it responds to the rate of cooling and can take place under isothermal conditions such as the transformation in some other Fe-based alloys (for example Fe-Ni-Mn); * Corresponding author.…”

“…Athermal martensites form the dominant group, but examples of isothermal martensites also exist. Using different microscopy techniques and studies, the physical properties of athermal ␣ (bcc)-martensite in a Fe-24%Ni-5%Mo alloy have been extensively investigated in an early study; that study was mainly concerned with morphological and crystallographic features, and lath dimensions of the observed martensite packets [2][3][4][5]. According to the reported results, athermal martensitic transformations show only one crystallographic and morphological feature and ␣ -martensite forms in Fe-24%Ni-5%Mo alloy.…”

Characteristics and Principles of Silicon Effect on the Properties of Steel

“…По мнению Бхадешиа [18], пластинки бей-нита зарождаются, имея то же содержание углерода, что и аустенит. Возможно, мы стал-киваемся с проявлением изотермической и атермической ступенями [17,19] мартенсит-ного превращения в сталях, причем верхняя находится в температурной области, где диф-фузия углерода становится заметной. Перенос углерода от α-фазы в γ-фазу стимулирует рост пластинок изотермического мартенсита, т. е. бейнита.…”