3D打印成形Ti-6Al-4V合金的组织和力学性能分析
Microstructures and Tensile Behavior of 3D Printed Ti-6Al-4V Alloy Sintered by Electron Beam Melting: An Experimental Study
查看参考文献14篇
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文摘
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采用3D打印方法制得Ti-6Al-4V合金形成梯度组织,通过实验测试方法对其组织以及拉伸力学性能进行测试分析。研究结果表明:各区域形成了不同尺寸与分布形态的β晶粒。试样形成了清晰的层带间界线,相邻层带间界线距离约2.5 mm。各个高度处都形成了片层组织,不同部位的α片层具有明显不同的尺寸。在各个高度处的试样拉伸测试得到的屈服强度基本一致,而拉伸强度由底部的842 MPa增大至顶部的895 MPa,同时断裂伸长率上升。合金顶端形成了较多位错,中间部位的位错密度发生了显著减小,到底部区域时位错已经很少。45°方向试样达到了最高的屈服/拉伸强度,强度最低的是Z方向试样; X和Y方向试样具备较高断裂延伸率,之后是45°方向试样,最小的是Z方向试样。 |
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其他语种文摘
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The microstructures and tensile behavior,of the 3D-printed,electron beam melted ( EBM)Ti-6Al- 4V alloy-plate ( 20 mm × 10 mm × 10 mm)with texture-gradient,were investigated with X-ray diffraction( XRD), scanning /transmission electron microscopy( SEM/TEM)and mechanical probes. Quite a few well-defined parallel “ribbons”,2.5 mm wide and formed with the lamellar layers,piled-up bottom up and comprising β-phased grains with different sizes and distributions,showed up,the boundary of which possibly originated from the thermal cycling of surface by e-beam. As the bottom-up height increased,the average size of β-phased grains rapidly-slowly increased, but the thickness of α-phased flakes rapidly decreased. As the height increased,the tensile strength increased from 842 to 895 MPa,accompanied by an increase of the elongation-at-break. A descending order of dislocation- defect density exists: the top>> the middle>> the bottom. Moreover,the anisotropic distributions of yield /tensile strengths and elongation-at-break were measured. |
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来源
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真空科学与技术学报
,2020,40(1):103-107 【扩展库】
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DOI
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10.13922/j.cnki.cjovst.2020.01.18
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关键词
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电子束快速成形
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Ti-6Al-4V合金
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显微组
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拉伸性能
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地址
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黄河水利职业技术学院机械工程学院, 开封, 475000
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中国科学院金属研究所, 沈阳, 110016
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-7126 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:6654098
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