Promising Variants of Initiation of Martensitic γ – α Transformation in Iron Alloys by a Couple of Elastic Waves

Resumo

Variants of initiation of growth of crystals of α-martensite by couples of elastic waves propagating in directions <001>_γ and <110>_γ in singles crystals of Fe31Ni are suggested. The dynamic theory is used to show that the expected orientations of habit planes {110}_γ, {001}_γ and {559}_γ differ from the typical {31015}_γ. Possible features of tetragonality of martensite crystals are discussed. The power of the sources of ultrasound required for initiation of γ – α martensitic transformation is estimated.