Residual Stress Measurement of Ground Composite Materials Prepared by Powder Metallurgy
Shigeki TAKAGO, Toshihiko SASAKI and Yukio HIROSE
Abstract:The distribution of the residual stress in ground layer of the sintered composite materials was examined with the X-ray diffraction technique. In this paper, Fe-Cr containing TiN particle material was prepared. Specimens were made by powder metallurgy. Macro- and microstresses were calculated by using the rule of mixture. The matrix (Fe-Cr): 310 and the inclusion (TiN): 420 diffractions were obtained with the Co-Kƒ¿ radiation. The distribution of the residual internal stress was evaluated by the electrolytic polishing. Furthermore, the ground surface was observed by a scanning electron microscope. Influences of the wheel depth of cut, the volume fraction of the inclusion on residual stresses beneath the surface were discussed. It was found that the residual stresses in the both phases increased with the increase in the depth of cut. The size of the compressive grinding phase stress zone of Fe-Cr/ TiN were about 50ƒÊm. The residual compressive stress in the TiN phase decreased with increase in the TiN content. Shear stress ƒÐ31 was small regardless of the depth of cut. Key Words:Residual stress, Composite materials, Macrostress, X-ray stress measurement, Microstress, Triaxial stress analysis, Grinding, Phase stress