成形方向及添加支撑对电子束选区熔化成形TC4合金组织与拉伸性能的影响
Effects of Forming Direction and Adding Support on Microstructure and Tensile Properties of TC4 Alloy Formed by Selective Electron Beam Melting
摘 要
以TC4合金粉末为原料,利用电子束选区熔化技术成形TC4合金拉伸试样,研究了轴向和径向2种成形方向以及添加支撑对合金显微组织和拉伸性能的影响。结果表明:无支撑径向成形合金存在等轴β晶及晶内针状α'相,形成魏氏集束组织和网篮组织,添加支撑后由粗大β柱状晶及两侧网篮组织组成;无支撑和添加支撑轴向成形合金上部分组织由初生α相和α'相组成,而下部分为等轴组织。添加支撑的径向成形合金的拉伸性能明显优于无支撑径向成形合金,其平均抗拉强度为1 173.52 MPa,屈服强度为1 155.69 MPa,断后伸长率达到15.57%,而添加支撑的轴向成形合金的拉伸性能与无支撑轴向成形合金相当,且均比径向成形合金差。
TC4合金
成形方向
添加支撑
显微组织
拉伸性能
electron beam selective melting
TC4 alloy
forming direction
support addition
microstructure
tensile property
Abstract
Taking TC4 alloy powder as raw material, TC4 alloy tensile samples were formed by electron beam selective melting technology. The effects of axial and radial forming directions and adding support on the microstructure and tensile properties of the alloy were studied. The results show that there were equiaxed β crystals and intragranular acicular α' phase in the radial formed alloy without support, forming Widmanstatten cluster structure and net basket structure; after adding support, it was composed of coarse β columnar crystal and net basket structure at two sides. The upper part of the axial formed alloy without and with support was composed of primary α phase and α' phase, while the lower part was equiaxed structure. The tensile properties of the radial formed alloy with support were significantly better than those of the radial formed alloy without support with average tensile strength of 1 173.52 MPa, the yield strength of 1 155.69 MPa, and the percentage elongation after fracture of 15.57%. The tensile properties of the axial formed alloy with support were comparable to those of the axial formed alloy without support, and were worse than those of radial formed alloy.
中图分类号 TG146.2 DOI 10.11973/jxgccl202306007
所属栏目 试验研究
基金项目 广西创新驱动发展专项资金资助项目(桂科AA18242046)
收稿日期 2022/3/22
修改稿日期 2022/8/19
网络出版日期
作者单位点击查看
联系人作者孙宝福
备注黄星光(1999-),男,广西钦州人,硕士研究生
引用该论文: HUANG Xingguang,SUN Baofu,XU Bohan,ZHANG Jianfei. Effects of Forming Direction and Adding Support on Microstructure and Tensile Properties of TC4 Alloy Formed by Selective Electron Beam Melting[J]. Materials for mechancial engineering, 2023, 47(6): 36～41
黄星光,孙宝福,徐博翰,张建飞. 成形方向及添加支撑对电子束选区熔化成形TC4合金组织与拉伸性能的影响[J]. 机械工程材料, 2023, 47(6): 36～41
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