Deformation Mechanisms of Selective Laser Melted 316l Austenitic Stainless Steel in High Temperature Low Cycle Fatigue
To investigate the low cycle fatigue (LCF) properties of SLM (Selective laser melting) 316L at 550℃ high temperature, a series of LCF tests at different strain amplitudes is conducted on SLM 316L and cold worked 316L. In contrast to the cyclic hardening behavior of cold worked 316L, SLM 316L is shown to have a stable cyclic softening behavior and high fatigue life due to its high strength. The coarsening of cellular sub-structure, evolution of geometrical necessary dislocation (GND) and texture direction contribute to the cyclic softening behavior of SLM 316L. Fractographic observations illustrate that strain amplitude has a significant influence on initiation and propagation of transgranular fatigue cracks, and lack-of-fusion defects in the sub-surface are key initiation sites of fatigue cracks. Additionally, the life prediction method of the non-Masing model is suitable for SLM 316L
Year of publication: |
[2022]
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Authors: | Chen, Yefeng ; Wang, Xiaowei ; Shen, Jiawei ; Peng, Yawei ; Jiang, Yong ; Yang, Xinyu ; B.Leen, Sean ; Gong, Jianming |
Publisher: |
[S.l.] : SSRN |
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