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Microscopic substructures of stainless steel 304 undergoing a uniaxial ratcheting deformation

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Abstract

Under asymmetrical stress-controlled cyclic loading accompanied by ratcheting, the evolution of microscopic substructures of stainless steel 304 (SS304), a face-centered cubic metal, was detected using transmission electron microscopy (TEM). This observation demonstrates that dislocation slip is the main mechanism of uniaxial ratcheting in the non-steady stage (stage I). Dislocation proliferate rapidly duo to the high stress level of the cyclic tests, and dislocation density increases continuously with the the number of cycles. The ratcheting rate decreases continuously due to the interaction of moveable dislocations, and the planar dislocation substructures (dislocation pileups and tangles) are the dominant patterns in this stage. In the later stage I, distinct lath \(\alpha \)-martensite was observed in the material due to the nucleation of martensite and the phase transformation zones increase gradually with the growth of axial ratcheting strain in the stage II of uniaxial ratcheting. The multiply and cross-slip were activated gradually in increasing numbers of grains, and the prevailing dislocation configurations evolve into more complicated and stable ones (dislocation walls and cells). In addition the dislocation configurations after various prescribed tensile strain of the monotonic tension and creep deformation with three different holding times were also observed by TEM. Comparing the evolution of microscopic substructures in various loading modes, the physical mechanism of uniaxial ratcheting of SS304 can be revealed as combination of the evolution of dislocation configurations and martensite transformation in the stage II of uniaxial ratcheting.

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Acknowledgements

The authors wish to gratefully acknowledge the financial supports by the National Science Foundation of China (grant no. 11502115), the Natural Science Foundation of Jiangsu Province (grant nos. BK20150777 and BK20190437), as well as the Fundamental Research Funds for the Central Universities (grant no. 30920021147)

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  1. School of Science, Nanjing University of Science and Technology, Nanjing, 210094, China

    Yawei Dong, Zhiyong Zhang & Xu He

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  1. Yawei Dong
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Correspondence to Yawei Dong.

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Dong, Y., Zhang, Z. & He, X. Microscopic substructures of stainless steel 304 undergoing a uniaxial ratcheting deformation. Acta Mech 231, 4919–4931 (2020). https://doi.org/10.1007/s00707-020-02804-6

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  • DOI: https://doi.org/10.1007/s00707-020-02804-6

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