Mechanical behaviours of the hierarchical microstructure of PBF-LB/M 316L SS during high cycle fatigue

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-02-01 DOI:10.1016/j.msea.2024.147652

Xuemei Lyu, Jiali Zhang, Felix Weber, Alexander Bezold, Christoph Broeckmann

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Abstract

A thorough understanding of the relations between the processing parameters, microstructures, and fatigue performances is essential for applying Laser Powder Bed Fusion (PBF-LB/M) 316L stainless steel (SS). The close study of the evolution of its hierarchical microstructure during high cycle fatigue (HCF) enables an understanding of the fatigue mechanisms. This work investigates the evolution of the microstructures of two sets of PBF-LB/M 316L SS specimens produced with two preheating temperatures of the building platform, namely 200 °C and 400 °C, during HCF tests. The fatigue tests were performed in a quasi-in-situ way to facilitate the observation of the local plasticity down to the level of dislocation cells. It was found that the lack of fusion defects dominate the fatigue crack initiation, while plasticity is constrained in the interior of the subgrains. The stable dislocation cells are also confirmed to resist plastic deformation and contribute to the strength of the material.

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.