Promising Versions of alpha-Martensite Rod-Like Crystal Initiation in Iron Alloys by Three Elastic Wave Sources

Versions are provided for alpha-martensite rod-shaped crystal initiation by three orthogonal longitudinal elastic waves propagating in orthogonal directions of the types aOE (c) 001 >(gamma) and aOE (c) 110 >(gamma) in Fe - 31% Ni single crystals. The probability is considered of direct initiation by Bain-type deformation waves. It is demonstrated within the scope of dynamic theory that the anticipated orientation of rod-like crystals is close to aOE (c) 111 >(gamma) or to aOE (c) 905 >(gamma). Possible features of martensite crystal tetragonality are discussed. Ultrasound source power required for initiating martensitic transformation is determined.
Work was carried out with financial support of the RFFI (project number 14-08-00734).