Open Access Conference Proceedings

Residual stresses exist in material independently of the presence of any external loads. Their presence may not be readily apparent and so they may be overlooked or ignored during a process of engineering design. This however can cause great design risk because they can have profound impact on material strength, dimensional stability and fatigue life. Almost all manufacturing processes create residual stresses that can further develop during service life of the manufactured component. Several comparative, qualitative and quantitative methods for stress analysis are nowadays applied in engineering praxis. Among them X-ray diffraction is one of the most used and developed over the past 90 years. In this article we describe novel concept of two-dimensional X-ray diffraction (XRD2) and we demonstrate its applicability on determination of residual strains and stresses in a bimetallic austenite/ferrite steel system. Our analysis is based on X-ray micro-diffraction experimental utilizing hard monochromatic X-rays focused down to micrometer size. In this way bimetal in bulk form was analyzed and microstructural differences between the joined materials and their interface were determined.

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