Determination of Residual Stresses in an Oxidized Metallic Alloy under Thermal Loadings

In order to clarify the mechanical features of a metal under thermal cyclic loading for the system Ni30Cr-<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mrow> <mi>Cr</mi> </mrow> <mn>2</mn> </msub> <msub> <mi mathvariant="normal">O</mi> <mn>3</mn> </msub> </mrow> </semantics> </math> </inline-formula>, a specific study has been carried out. In the present work, the residual stresses in both the metal and the oxide layer have been investigated. An adapted method is applied to process the experimental results that were obtained by using in-situ high temperature synchrotron diffraction at European Synchrotron Radiation Facility. The <inline-formula> <math display="inline"> <semantics> <mrow> <msup> <mrow> <mi>sin</mi> </mrow> <mn>2</mn> </msup> <mi mathvariant="sans-serif">&#968;</mi> </mrow> </semantics> </math> </inline-formula> analysis provides information about the stress in metal and oxide. X-ray diffraction provides also the lattice parameter between crystallographic planes in the metal. To obtain correct stress values, a correction method is also proposed taking into account different discrepancies sources to ensure the equation of mechanical balance.

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