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Orientation Dependence of the Deformation Microstructure in a Fe-30Ni-Nb Model Austenitic Steel Subjected to Hot Uniaxial Compression

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Abstract

The present work was aimed at a detailed investigation of the orientation dependence of the microstructure characteristics in a Fe-30Ni-Nb austenitic model steel subjected to hot uniaxial compression at 1198 K (925 °C) at a strain rate of 1 s−1 to several strain levels up to 1.0. The quantification of the substructure evolution as a function of strain was performed for the stable 〈011〉 oriented grains. Other grain orientations were also investigated in detail at a strain of 0.2. The 〈110〉 oriented grains contained self-screening arrays of “microbands” (MBs) aligned with high Schmid factor {111} slip planes. The MB crystallographic alignment was largely maintained up to a strain of 1.0, which suggests that the corresponding boundaries kept continuously rearranging themselves during straining and did not follow the sample shape change. The mean MB spacing decreased and misorientation angle increased with strain towards saturation, indicating the operation of the “repolygonization” dynamic recovery mechanism. The non-〈011〉 oriented grains displayed a strong tendency to split during deformation into deformation bands having alternating orientations and being mutually rotated by large angles. The bands were separated by transition regions comprising arrays of closely spaced, extended sub-boundaries collectively accommodating large misorientations across very small distances.

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Acknowledgments

The present work was carried out with the support of the Deakin Advanced Characterisation Facility. Financial support provided by the Australian Research Council is gratefully acknowledged.

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Correspondence to Pavel Cizek.

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Manuscript submitted on July 3, 2015.

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Poddar, D., Cizek, P., Beladi, H. et al. Orientation Dependence of the Deformation Microstructure in a Fe-30Ni-Nb Model Austenitic Steel Subjected to Hot Uniaxial Compression. Metall Mater Trans A 46, 5933–5951 (2015). https://doi.org/10.1007/s11661-015-3182-z

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