Numerical analysis on the local mechanical fields in polycrystalline 316LN stainless steel under cyclic fatigue loading: Comparison with experimental results

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:696

Article

Basseville, S.^1,2  Cailletaud, G.²  Ghidossi, T.³  Guilhem, Y.⁴  Lacoste, E.³  Proudhon, H.²  Signor, L.³  Villechaise, P.³ 

[1] Univ Versailles St Quentin En Yvelines, 45 Ave Etats Unis, F-78035 Versailles, France

[2] PSL Res Univ, MINES ParisTech, Ctr Mat, CNRS UMR 7633, BP 87, F-91003 Evry, France

[3] Univ Poitiers, ISAE ENSMA, CNRS UPR 3346, Inst P, 11 Blvd Marie & Pierre Curie,BP 30179, F-86962 Futuroscope, France

[4] Univ Paris Saclay, LMT, ENS Paris Saclay, CNRS, 61 Ave President Wilson, F-94235 Cachan, France

关键词: Polycrystal;    316LN Steel;    Crystal plasticity;    Finite element;    Fatigue;   

DOI  :  10.1016/j.msea.2017.04.023

来源: Elsevier

【 摘 要 】

The present paper is devoted to the study of the parameters responsible for the initiation and/or propagation of transgranular microcracks in polycrystalline materials. The investigation is carried out on an aggregate made of 316LN stainless steel which 3D grain shape and orientation were reconstructed using 2D serial Electron BackScattered Diffraction scans. The evaluation and the analysis of the local mechanical fields at the free surface of the polycrystalline aggregate subjected to cycling loading are performed using Finite Element Crystal Plasticity. Two crystal plasticity models are used and compared through Finite Element computations: quasi physical or phenomenological models. The local parameters which possibly drive crack initiation are analysed and then compared to the experimental observations. A new criterion predicting whether a specific grain is likely to present a fatigue crack initiation is finally proposed.

【 授权许可】

Free