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Graphene-strengthened Inconel 625 Alloy Fabricated by Selective Laser Melting

机译：石墨烯增强的Inconel 625合金通过选择性激光熔化制造

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摘要

Graphene has been widely used as a reinforcement phase in composites due to its excellent electrical, thermal and mechanical properties. In this study, graphene was modified by electroless nickel plating to obtain nickel-coated graphene (Ni-Gr), which was then introduced into spherical Inconel 625 powder by ball milling. Selective laser melting (SLM) was subsequently used to fabricate Inconel 625/Ni-Gr metal matrix composites containing different levels of Ni-Gr (0, 0.4 vol%, 1.0 vol%). The effects of Ni-Gr content on the microstructure, mechanical, wear and corrosion properties of Inconel 625/Ni-Gr composites were investigated. Noticeable grain refinement was observed at the addition of 0.4 vol% Ni-Gr. The micro-hardness of Inconel 625/Ni-Gr composites increased with increasing Ni-Gr content and registered 348.2 HV_(0.2) at the addition of 1.0 vol% Ni-Gr. However, the Inconel 625/0.4Ni-Gr composite attained the maximum tensile strength (927 MPa), yield strength (797 MPa) and elastic modulus (227 GPa), aside from exhibiting lower friction coefficients than Inconel 625 at room temperature. In addition, it displayed higher corrosion potential than Inconel 625 and lower corrosion current density than Inconel 625/1.0Ni-Gr. The addition of Ni-Gr clearly improves the micro-hardness, tensile strength, yield strength, wear and corrosion properties of Inconel 625 due to grain refinement, solid-solution strengthening and impediment to dislocation motion. And, this study has verified the feasibility of preparing Inconel 625/Ni-Gr composites by SLM.
机译：由于其优异的电，热和机械性能，石墨烯已被广泛用作复合材料中的增强相。在该研究中，通过化学镀镍改性石墨烯，得到涂镍的石墨烯（Ni-GR），然后通过球磨将其引入球形Inconel 625粉末中。随后使用选择性激光熔融（SLM），用于制造含有不同水平的Ni-Gr（0,0.4体积％，1.0体积％）的625 / Ni-GR金属基质复合材料。研究了Ni-GR含量对Inconel 625 / Ni-GR复合材料的微观结构，机械，磨损和腐蚀性能的影响。在添加0.4Vol％Ni-Gr下观察到明显的晶粒细化。 Inconel 625 / Ni-Gr复合材料的微硬度随着Ni-GR含量的增加而增加，加入1.0 Vol％Ni-Gr的348.2 HV_（0.2）。然而，除了在室温下表现出低于625的情况下，Inconel 625 / 0.4Ni-Gr复合材料达到了最大拉伸强度（927MPa），屈服强度（797MPa）和弹性模量（227mPa），除了比625在室温下的625。另外，它显示出比Inconel 625更高的腐蚀电位，并且比625 / 1.0NI-GR更低的腐蚀电流密度。由于晶粒细化，固体溶液强化和障碍物，Ni-Gr的添加显着提高了Inconel 625的微硬度，拉伸强度，屈服强度，耐磨性和腐蚀性。而且，该研究验证了SLM制备625 / Ni-GR复合材料的可行性。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140099.1-140099.13|共13页
  • 作者

    Xiaofeng Li; Denghao Yi; Bin Liu; Jinfang Zhang; Xiaohui Yang; Congwei Wang; Yinghao Feng; Peikang Bai; Yong Liu; M. Qian;

  • 作者单位

    School of Materials Science and Engineering North University of China Taiyuan 030051 PR China The State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China;

    School of Materials Science and Engineering North University of China Taiyuan 030051 PR China;

    School of Materials Science and Engineering North University of China Taiyuan 030051 PR China;

    School of Materials Science and Engineering North University of China Taiyuan 030051 PR China The State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China;

    The State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China Instrumental Analysis Center Taiyuan University of Science and Technology Taiyuan 030024 PR China;

    The State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 PR China;

    School of Materials Science and Engineering North University of China Taiyuan 030051 PR China;

    School of Materials Science and Engineering North University of China Taiyuan 030051 PR China;

    The State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China;

    Centre for Additive Manufacturing School of Engineering RMIT University Melbourne VIC 3000 Australia;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Selective laser melting; Inconel 625; Graphene; Mechanical properties; Corrosion properties;

    机译：选择性激光熔化;Inconel 625;石墨烯;机械性能;腐蚀性质;

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