| 摘要: |
| 为了探究激光选区熔化( Selective laser melting, SLM) Ti-12Mo-6Zr-2Fe(TMZF) β 钛合金的腐蚀电化学行为,采用纯 Mo 粉末和 Mo-Fe 中间合金合金粉两种不同的 Mo 元素添加形式分别组成混合粉末进行激光增材制造,研究了中间合金粉末对 TMZF 合金试样组织与电化学性能的影响。 结合 X 射线衍射仪(XRD),金相显微镜(OM),扫描电子显微镜(SEM)、能谱分析(EDS)及腐蚀电化学等材料表征手段对 SLM TMZF 试样的物相分布、微观组织结构、元素分布及耐腐蚀性能进行了对比分析。 结果表明,单质混粉制备的 SLM-β-1 试样与中间合金混粉制备的 SLM-β-2 试样的组织中都含有大量的 β-Ti 组织,SLM-β-1 试样在 Bode 图中显示出更高的阻抗,Nyquist 图中 SLM-β-1 试样的容抗弧半径要大于 SLM-β-2 试样,动电位极化曲线中 SLM-β-1 试样的钝化膜击破电位要高于 SLM-β-2 试样。 综合对比发现单质混合粉末 SLM-β-1 试样的耐腐蚀性能要优于中间合金混合粉末 SLM-β-2 试样的耐腐蚀性能。 |
| 关键词: 激光选区熔化 混合粉末 Ti-12Mo-6Zr-2Fe 微观组织 耐腐蚀性能 |
| DOI：10.11933/j.issn.1007-9289.20201021001 |
| 分类号:TG146.1;TG113.2 |
| 文章编号:1007-9289(2020)06-0128-08 |
| 文献标识码:A |
| 基金项目:广东省科学院专项资金项目(2021GDASYL-20210102005) |
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| Effects of Master Alloy Powders on Electrochemical Performance of Selective Laser Melted TMZF Alloy |
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Zhe Qingkun1,2, Deng Chaoyang2, Yan Xingchen2, Ma Wenyou2, Hu Yongjun1, Liu Min2
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1.College of materials and energy, Guangdong University of Technology, Guangzhou 510006 , China;2.National Engineering Laboratory for Modern Materials Surface Engineering Technology, The Key Lab of Guangdong for Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650 , China
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| Abstract: |
| In order to investigate the electrochemical corrosion behavior of selective laser melting (SLM) Ti-12Mo-6Zr-2Fe (TMZF) β titanium alloy, pure Mo powders and Mo-Fe master alloy powders were used to form mixed powders for laser additive manufacturing. The effect of master alloy powders on the microstructure and electrochemical properties of TMZF alloy sample was studied. The corrosion electrochemical properties of SLM TMZF samples fabricated via the two different mixed powders were sys- tematically studied and compared. Phase composition, microstructural characteristics, elements distribution and corrosion resist- ance of the SLM TMZF samples were investigated using XRD, OM, SEM, EDS and electrochemical corrosion (EC). Results show that both SLM-β-1 (prepared by mixing a variety of pure metal powders) and SLM-β-2 (prepared by mixing intermetallic compounds powders) samples contain a large amount of β-Ti microstructure. SLM-β-1 sample show higher impedance in Bode plots. The capacitive arc radius of SLM-β-1 sample is larger than that of SLM-β-2 sample in Nyquist plots. The breakdown potential of passive film of SLM-β-1 sample in potentiodynamic polarization curve is higher than that of SLM-β- 2 sample.Comprehensive comparison show that the corrosion resistance of SLM-β-1 (prepared by mixing a variety of pure metal powders) sample is better than that of SLM-β-2 ( prepared by mixing intermetallic compounds powders) sample under different mixed powders. |
| Key words: selective laser melting mixed powders Ti-12Mo-6Zr-2Fe microstructure corrosion resistance |
