Abstract
Neutron diffraction was used to investigate the residual lattice strains in AL6XN austenitic stainless steel subjected to tensile loading at different temperatures, revealing the development of large intergranular stresses after plastic deformation. Elastic–plastic self-consistent modeling was employed to simulate the micromechanical behavior at room temperature. The overall variations of the modeled lattice strains as a function of the sample direction with respect to the loading axis agree in general with the experimental values, indicating that dislocation slip is the main plastic deformation mode. At 300 °C, the serrated flow in the stress–strain curve and the great amount of slip bands indicate the appearance of dynamic strain aging. Except for promoting the local strain concentration, the long-range stress field caused by the planar slip bands near the grain boundaries is also attributed to the decrease in the experimental intergranular strains. An increase in the lattice strains localized at some specific specimen orientations for reflections at 600 °C may be explained by the segregation of solute atoms (Cr and Mo) at dislocation slip bands. The evolution of full-width at half-maximum demonstrates that the dynamic recovery indeed plays an important role in alleviating the local strain concentrations during tensile loading at 600 °C.
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Acknowledgments
This work was supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403804), the National Natural Science Foundation of China (Nos. 51231002 and 51401193), and the Joint Foundation of NSFC and CAEP (NSAF) (No. U1430132). Neutron diffraction experiment was carried out on the Residual Stress Neutron Diffraction (RSND) at the China Academic of Engineering Physics in Mianyang.
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Manuscript submitted December 5, 2017.
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Hong, Y., Li, S., Li, H. et al. Development of Intergranular Residual Stress and Its Implication to Mechanical Behaviors at Elevated Temperatures in AL6XN Austenitic Stainless Steel. Metall Mater Trans A 49, 3237–3246 (2018). https://doi.org/10.1007/s11661-018-4655-7
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DOI: https://doi.org/10.1007/s11661-018-4655-7