PSI - Issue 43

Jiří Man et al. / Procedia Structural Integrity 43 (2023) 203 – 208

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Author name / Structural Integrity Procedia 00 (2022) 000 – 000

amplitude – see Fig. 4. In the case of cyclic loading with lower stress amplitude where no systematic softening was documented (see Fig. 2c) DIM particles of irregular amoeba-shape were within well-oriented individual grains arranged along the macroscopically parallel bands (Fig. 4a). Detail characterization of DIM particles in thin FIB foils using TEM reveals their 3D nature within a macroscopic band (cf. Figs 5a and 5b). In addition, as apparent from Figs 5b,c showing DIM distribution in the section perpendicular to slip bands and parallel to the stress axis (Fig. 5a), irregular amoeba-shape DIM particles are clearly elongated along a slip plane trace indicating thus their growth in the direction of active Burgers vector. Cyclic loading with higher stress amplitude resulted in a lower amount of DIM in agreement with the previous studies by Blinn et al. (2018, 2019a,b, 2020). In this case the cyclic strain is localized in PSBs (persistent slip bands) in numerous grains (see Fig. 4b and Man et al (2022)) which resulted in permanent cyclic softening as can be seen in Fig. 2. DIM particles are thus distributed more homogeneously in the volume of material – see Fig. 4b. A tendency to form DIM particles at places where PSBs impinge the grain boundaries or MPBs may be related to chemical inhomogeneities documented in these areas by several authors (Moyle et al. (2022), Godec et al. (2020)). Acknowledgements The research was supported by H2020-WIDESPREAD-2018-03 under the grant agreement No. 857124, the Twinning project on the Structural Integrity and Reliability of Advanced Materials obtained through additive Manufacturing (SIRAMM). References Cui, L., Jiang, F., Deng, D., Xin, T., Sun, X., Mousavian, R. T., Peng, R. L., Yang, Z., Moverare, J., 2021. Cyclic Response of Additive Manufactured 316L Stainless Steel: The Role of Cell Structures. 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