Cyclic response of additive manufactured 316L stainless steel: The role of cell structures

SCRIPTA MATERIALIA

卷:205

Article

Cui, Luqing¹  Jiang, Fuqing²  Deng, Dunyong¹  Xin, Tongzheng³  Sun, Xiaoyu¹  Mousavian, Reza Taherzadeh⁴  Peng, Ru Lin¹  Yang, Zhiqing^2,5  Moverare, Johan¹ 

[1] Linkoping Univ, Dept Management & Engn, Div Engn Mat, SE-58183 Linkoping, Sweden

[2] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Beijing, Peoples R China

[3] Univ New South Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia

[4] Dublin City Univ, Adv Mfg Res Ctr, I Form, Dublin 9, Ireland

[5] Ji Hua Lab, Foshan 528200, Peoples R China

关键词: Additive manufacturing;    316L stainless steel;    Cellular structure;    Cyclic response behavior;    Deformation mechanism;   

DOI  :  10.1016/j.scriptamat.2021.114190

来源: Elsevier

【 摘 要 】

We report the effect of cell structures on the fatigue behavior of additively manufactured (AM) 316L stainless steel (316LSS). Compared with the cell-free samples, the fatigue process of fully cellular samples only consists of steady and overload stages, without an initial softening stage. Moreover, the fully cellular sample possesses higher strength, lower cyclic softening rate and longer lifetime. Microscopic analyses show no difference in grain orientations, dimensions, and shapes. However, the fully cellular samples show planar dislocation structures, whereas the cell-free samples display wavy dislocation structures. The existence of cell structures promotes the activation of planar slip, delays strain localization, and ultimately enhances the fatigue performance of AM 316LSS. (c) 2021 The Author(s). Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

【 授权许可】

Free