Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

Xiao-qing Ni; De-cheng Kong; Ying Wen; Liang Zhang; Wen-heng Wu; Bei-bei He; Lin Lu; De-xiang Zhu

doi:10.1007/s12613-019-1740-x

Volume 26 Issue 3

Mar. 2019

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文章导航 > 矿物冶金与材料学报（英文） > 2019 > 26(3): 319-328

Xiao-qing Ni, De-cheng Kong, Ying Wen, Liang Zhang, Wen-heng Wu, Bei-bei He, Lin Lu, and De-xiang Zhu, Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 319-328. https://doi.org/10.1007/s12613-019-1740-x

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Xiao-qing Ni, De-cheng Kong, Ying Wen, Liang Zhang, Wen-heng Wu, Bei-bei He, Lin Lu, and De-xiang Zhu, Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting, Int. J. Miner. Metall. Mater., 26(2019), No. 3, pp. 319-328. https://doi.org/10.1007/s12613-019-1740-x

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研究论文

Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

Shanghai Engineering Research Center of 3D Printing Materials, Shanghai Research Institute of Materials, Shanghai 200437, China
Corrosion and Protection Center, Key Laboratory for Corrosion and Protection(MOE), University of Science and Technology Beijing, Beijing 100083, China

通讯作者:
Liang Zhang E-mail: lzhang0126@hotmail.com

中文摘要

The corrosion behavior and mechanical properties of 316L stainless steel (SS) fabricated via selective laser melting (SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile experiments. The microstructural anisotropy of SLMed 316L SS was also investigated by electron back-scattered diffraction and transmission electron microscopy. The grain sizes of the SLMed 316L SS in the XOZ plane were smaller than those of the SLMed 316L SS in the XOY plane, and a greater number of low-angle boundaries were present in the XOY plane, resulting in lower elongation for the XOY plane than for the XOZ plane. The SLMed 316L was expected to exhibit higher strength but lower ductility than the wrought 316L, which was attributed to the high density of dislocations. The pitting potentials of the SLMed 316L samples were universally higher than those of the wrought sample in chloride solutions because of the annihilation of MnS or (Ca,Al)-oxides during the rapid solidification. However, the molten pool boundaries preferentially dissolved in aggressive solutions and the damage of the SLMed 316L in FeCl₃ solution was more serious after long-term service, indicating poor durability.

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Research Article

Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

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Abstract

Abstract

The corrosion behavior and mechanical properties of 316L stainless steel (SS) fabricated via selective laser melting (SLM) were clarified by potentiodynamic polarization measurements, immersion tests, and tensile experiments. The microstructural anisotropy of SLMed 316L SS was also investigated by electron back-scattered diffraction and transmission electron microscopy. The grain sizes of the SLMed 316L SS in the XOZ plane were smaller than those of the SLMed 316L SS in the XOY plane, and a greater number of low-angle boundaries were present in the XOY plane, resulting in lower elongation for the XOY plane than for the XOZ plane. The SLMed 316L was expected to exhibit higher strength but lower ductility than the wrought 316L, which was attributed to the high density of dislocations. The pitting potentials of the SLMed 316L samples were universally higher than those of the wrought sample in chloride solutions because of the annihilation of MnS or (Ca,Al)-oxides during the rapid solidification. However, the molten pool boundaries preferentially dissolved in aggressive solutions and the damage of the SLMed 316L in FeCl₃ solution was more serious after long-term service, indicating poor durability.
- selective laser melting;
- mechanical property;
- corrosion resistance;
- 316L stainless steel;
- anisotropy;
- molten pool boundary

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Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

中文摘要

Anisotropy in mechanical properties and corrosion resistance of 316L stainless steel fabricated by selective laser melting

Abstract

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