The level of residual stresses generated in fusion welds has been a major area of interest for many years. For steels, a major influence on the final state of stress is through martensitic transformation. This is because the martensitic transformation is accompanied by significant shear and volume strains. One way to mitigate the development of residual stress is by controlling the onset of the transformation such that the associated strain is able to compensate for thermal contraction all the way down to ambient temperatures. It has not been possible in the past to follow the evolution of the phase transformation during cooling of weld metal. This paper describes the first work in which the transformations that happen during the cooling of reheated weld metal have been characterized by implementing a thermomechanical simulator on a synchrotron diffraction beam line at ESRF.
Materials Science Forum, Vols 571-572, 2008, 393-398.
A conversation between Audrey and Lauren, on the content of the paper.
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