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首页> 外文期刊>Materials Science and Engineering >Mechanical properties and microstructure of laser welded Ti-6Al-2Sn-4Zr-2Mo (Ti6242) titanium alloy
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Mechanical properties and microstructure of laser welded Ti-6Al-2Sn-4Zr-2Mo (Ti6242) titanium alloy

机译：Ti-6Al-2Sn-4Zr-2Mo（Ti6242）钛合金激光焊接的力学性能和组织

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摘要

Room temperature tensile properties and microhardness of a laser welded Ti-6Al-2Sn-4Zr-2Mo (Ti6242) titanium alloy sheet were examined and correlated to the microstructure evolution across the weld. Tensile testing integrated with the optical image correlation Instron~® system indicated that the average yield strength (YS), ultimate tensile strength (UTS), and total elongation of the weldment were respectively 88%, 87%, and 69% of the corresponding base material (BM) values. Electron probe micro-analysis (EPMA) demonstrated a uniform distribution of the main alloying elements across the weld. The hardness raised increasingly from the BM toward the heat affected zone (HAZ) and the fusion zone (FZ) due to mainly a higher α volume fraction in HAZ and acicular α' martensite formation in the FZ. Because of the higher hardness of the HAZ and FZ, a higher YS for the weldment relative to the BM would be expected. However, the lower YS as well as the lower UTS of the weldment can be explained by presence of some porosity and underfill in the FZ. The lower total elongation of the weldment compared to the BM can be related to the higher hardness of the HAZ and FZ.
机译：研究了激光焊接的Ti-6Al-2Sn-4Zr-2Mo（Ti6242）钛合金薄板的室温拉伸性能和显微硬度，并将其与整个焊缝的组织演变联系起来。集成有光学图像相关Instron〜®系统的拉伸测试表明，焊件的平均屈服强度（YS），极限抗拉强度（UTS）和总伸长率分别为相应基础的88％，87％和69％材料（BM）值。电子探针显微分析（EPMA）显示了整个焊缝中主要合金元素的均匀分布。硬度从BM向热影响区（HAZ）和熔合区（FZ）逐渐增加，这主要是由于HAZ中较高的α体积分数和FZ中的针状α'马氏体形成。由于HAZ和FZ的硬度更高，因此相对于BM，焊件的YS更高。但是，焊件中较低的YS和较低的UTS可以通过FZ中存在一些孔隙和底部填充来解释。与BM相比，焊件的总伸长率较低可能与HAZ和FZ的较高硬度有关。

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  • 来源
    《Materials Science and Engineering》 |2016年第29期|213-224|共12页
  • 作者

    A. Chamanfar; T. Pasang; A. Ventura; W.Z. Misiolek;

  • 作者单位

    Institute for Metal Forming, Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015, USA;

    Department of Mechanical Engineering, Auckland University of Technology, Auckland, New Zealand;

    Institute for Metal Forming, Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015, USA;

    Institute for Metal Forming, Department of Materials Science and Engineering, Lehigh University, 5 East Packer Avenue, Bethlehem, PA 18015, USA;

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  • 正文语种 eng
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  • 关键词

    Titanium alloy; Laser welding; Mechanical properties; Microstructure; EPMA;

    机译：钛合金激光焊接;机械性能微观结构环保局;

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