Effect of temperature and strain rate on cavitation in a superplastic duplex stainless

摘要

The effect of temperature and strain rate on cavitation during superplastic deformation of a duplex stainless steel has been studied at 1223 K and 1253 K for initial strain rates ranging from 2 x 10~4s~1 to 2 x 10~3s~1. The cavitation was analyzed quantitatively for a specificall developed image processing technique that allows an accurate determination of the volume fraction and size distribution of the voids. The results show that increasing temperature and/or decreasing strain rate cause a more homogeneous deformation of the specimen characterized by a uniform size and distribution of the cavities.