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"Multiscale in-situ studies of strain-induced martensite formation in i" by Frank Niessen, Azdiar A. Gazder et al.

An extra low carbon martensitic stainless steel with 16% ultrafine grained metastable reverted austenite was subjected to uniaxial tensile testing and investigated with in-situ energy-dispersive synchrotron X-ray diffraction (XRD) and in-situ electron backscatter diffraction (EBSD) to reveal the complex interplay between stress, strain and martensitic transformation. In-situ XRD demonstrated that, upon surpassing the yield strength, the fraction of reverted austenite declined linearly with increasing true stress, which was associated with transformation-induced plasticity (TRIP). EBSD and XRD consistently showed that the texture of martensite evolved from an initially weak texture towards a strong 110α′ fiber parallel to the tensile axis. For the first time, stress partitioning between (remaining) reverted austenite and the martensite matrix was determined quantitatively during in-situ XRD by averaging over the stress values obtained from lattice strains for multiple reflections. Ma ....

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