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首页> 外文期刊>Materials Science and Engineering >Microstructure and mechanical properties of the austenitic stainless steel 316L fabricated by gas metal arc additive manufacturing
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Microstructure and mechanical properties of the austenitic stainless steel 316L fabricated by gas metal arc additive manufacturing

机译：气体金属电弧增材制造的奥氏体不锈钢316L的组织和力学性能

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摘要

The austenitic stainless steel 316L was fabricated by gas metal arc additive manufacturing (GMA-AM) and its microstructure and room temperature tensile properties were investigated. Results show that in the GMA-AM 316L plate, a large number of well-aligned austenitic dendrites vertically orient, forming large columnar grains in the middle and some dendrites bent toward the plate surfaces, forming small columnar grains near the edges. The microstructure of GMA-AM 316L consists of δ, γ and α phases. After one layer was deposited, the 8 phase exhibited reticular morphology within austenitic dendrites. The 8 phase redissolved in austenite with the in-termetallic o phases forming at γ/δ interfaces under the thermal cycles influence of subsequent three deposition layers. And under the thermal influence after the fourth layers, both 8 and a phases turned into fine vermicular morphologies within austenitic dendrites. The tensile properties of GMA-AM 316L steel are comparable to wrought 316L and exceed the industry requirements for 316L. Its fracture type is ductile fracture due to the obvious fracture surface dimples. The microcracks initiate at the interior of a phases and grow into large cracks leading to materials failure.
机译：奥氏体不锈钢316L是通过气体金属电弧增材制造（GMA-AM）制造的，并研究了其显微组织和室温拉伸性能。结果表明，在GMA-AM 316L板中，大量排列良好的奥氏体树枝状晶体垂直取向，在中部形成大的柱状晶粒，一些树枝状晶体向板表面弯曲，在边缘附近形成小的柱状晶粒。 GMA-AM 316L的微观结构由δ，γ和α相组成。沉积一层后，8相在奥氏体树突内显示出网状形态。在随后的三个沉积层的热循环影响下，8相重新溶解在奥氏体中，在γ/δ界面形成金属间o相。并且在第四层之后的热影响下，奥氏体枝晶内的8相和a相均转变为精细的蠕虫形态。 GMA-AM 316L钢的拉伸性能与锻制316L相当，并且超过了316L的行业要求。由于明显的断裂表面凹坑，其断裂类型为韧性断裂。微裂纹始于相的内部，并成长为大裂纹，导致材料失效。

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  • 来源
    《Materials Science and Engineering》 |2017年第4期|567-577|共11页
  • 作者

    Xiaohui Chen; Jia Li; Xu Cheng; Bei He; Huaming Wang; Zheng Huang;

  • 作者单位

    National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center, Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, School of Materials Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing, China;

    National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center, Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, School of Materials Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing, China;

    National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center, Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, School of Materials Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing, China;

    National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center, Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, School of Materials Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing, China;

    National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center, Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, School of Materials Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing, China;

    National Engineering Laboratory of Additive Manufacturing for Large Metallic Components and Engineering Research Center, Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, School of Materials Science and Engineering, Beihang University, 37 Xueyuan Road, Beijing, China;

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  • 正文语种 eng
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  • 关键词

    Gas metal arc additive manufacturing; Austenitic stainless steel; Microstructure; a phase; Tensile properties;

    机译：气体金属电弧增材制造;奥氏体不锈钢;微观结构一个阶段拉伸性能;

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