Original paper(Vol.48 No.7 pp.692)

Abstract:A dual phase stainless steel consists of almost the same amount of both ferritic and austenitic phases, and possesses good corrosion proof as well as high strength characters, so that this material is used for ocean structures etc. Commonly, dual phase stainless steals are processed for industrial use by rolling, cutting, grinding, etc. Residual stress generated during these processes plays important role in practical use. Thus, measurement of residual stress in the dual phase stainless steal is very important. However, as this material is one of the composite materials in which different constituents with different physical properties such as an expansion coefficient and a mechanical property are involved, each constituents will posses a different residual stress and plastic strain due to the heat-treatment and/or other mechanical processes during manufacturing. Such microscopic complex state may affect the macroscopic properties of the material. In this study, these problems were investigated using the method of the X-ray stress measurement by which the residual stress in each constituent of composite materials can be obtained. In addition, effects of changes in grinding depth of cut on the residual stress in dual phase stainless steel were also discussed.

Key Words:Dual phase stainless, Grinding, Pesidual stress, Micromechanics, X-ray stress measurement