X線2D法によるステンレスばねの残留応力評価

抄録

In general, sin² ψ method is applied for measuring residual stresses of coil springs. There is no difficulity to perform the measuring in case of Spring steels, Ferritic or Martensitic steels, but in case of Austenitic stainless steels, measurement in high accuracy can’t be carried out for reason of stress induced transformation (Austenite⇒Martensite) and fiber structure strongly oriented through rolling and drawing processes. On the other hand, two-dimensional detector has been developed in the field of X-ray diffraction recently. This detector can also be applied to multiaxial stress measurement which is called 2D method. In this research, we tried to compare 2D method with sin² ψ method to improve the accuracy in measuring residual stress of stainless spring. In this study, it was clarified that the 2D method is suitable for measuring residual stresses in high accuracy for Austenitic stainless steels compared with general sin² ψ method.