Study of the role of the interface coherence on the hot deformation behaviour of duplex stainless steels

摘要

The Kurfjumpv-Sach orientation relationship fond between the deltaferrite and the austenite in the as cast duplex stainless steel seemsto be related to the low ductility of this material on hot working.The crack formation at the γα interphase is explained by means ofcoherence stresses concentrated At a stepped semicoherent boundary,giving rise to an non homogeneous partition of the deformationBetween the phases. In absence of DRX, it is found that both theincrease of the previous hot rolling reduction and the staticrecrystallisation in the austenite improve the hot ductility of thesematerials.