Martensitic transformation under stress

Thermodynamics considerations of martensitic transformation under stress are considered. The equation for dMs/dσ established by Patel and Cohen is discussed taking account of the grain size effect in polycrystalline materials, i.e. the orientation preference effect and the interaction between grain boundary and applied stress. A general model for the calculation of Ms temperature in the face centered cubic to body centered cubic (fcc → bcc(bct)) transformation influenced by stress in iron based alloys is proposed. Quantitative descriptions of strain effects on nucleation rate or nucleation barrier, activation energy and morphology, as well as the effect of internal stress on autocatalytic nucleation of martensitic transformation are briefly reviewed. The modeling of martensitic transformation under stress, involving modeling of the motion of martensite/parent interface and reorientation of martensite under stress is reviewed.