Distribution of residual stress was evaluated using the X-ray diffraction technique with image plate (IP). The IP is the 2D-detector for the X-ray radiation. This enables us to obtain phase stresses in the material from a single X-ray exposure. It is also expected that the method will be quicker for X-ray stress measurements than conventional sin 2 ψ method. In this study, the stress distribution of coarse-grained material was investigated. The oscillation method was used to obtain the sufficient of the crystals. An experiment was performed with ferrite and austenite duplex stainless steel, has a maximum grain size with 200/an. It was confirmed that the present method is suitable to determine the residual stress of the composite material


In the case of the X-ray stress measurement method (Japan Society of Material Science, 1986), the residual stress is determined by the combination between Bragg's equation and the theory of elasticity. Several investigations have been conducted on the sin 2 ψ technique using scintillation counter. On the other hand, the photograph method was practical used in 1960's. In this method, the stress was measured by using Laue camera and the X-ray film. Recently, image plate (IP) was developed as a new two dimensional X-ray detector (Amemiya et al. 1988). From the IP, the diffraction pattern was obtained sensitivity. Since the IP-data is the digital format, the treatment and the analysis of the IP are easier than that of the photograph method. The cos ce method (Taira et al. 1978) by means of the IP was reported first by Yoshioka et al. (Yoshioka et. al., 1978). Next, we applied the IP for the triaxial stress analysis (Sasaki et al., 1995 and Hirose et al., 1995).

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