Y2O3 dispersion strengthened TC4 powder and its laser cladding microstructure
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摘要: 激光熔覆修复技术可用于修复损伤的钛合金工件。与锻造件相比，熔覆件在激光熔覆过程中容易引入氧，导致氧含量偏高和强度偏低的问题。采用等离子旋转电极法（PREP）制备了TC4-xY(x = 0，0.1，0.3，0.5)的预合金粉末，并使用该合金粉末通过激光熔覆工艺技术方法修复TC4合金工件。结果表明，在钇(Y)引入后产生的弥散体Y2O3均匀分布在粉末上，随着Y含量的增加，粉末的显微维氏硬度增加。在TC4-xY熔覆层中，其显微维氏硬度随着Y含量的增加而增加。然而，由于脆性相析出的影响，熔覆层的拉伸性能呈现先上升后下降的趋势，其伸长率呈现相反的趋势，TC4-0.3Y熔覆层的1058 MPa拉伸性能最优异，同时伸长率也达到7.2%。通过对Y含量的调控，能够促进熔覆层组织改善与力学性能提升。Abstract: Laser cladding repairing technology can be used to repair damaged TC4 alloy components. Compared with forged components, oxygen is more easily introduced during laser cladding, which results that cladding components have the problems of high oxygen content and low strength. In this study, TC4-xY (x = 0, 0.1, 0.3, 0.5) prealloyed powder was prepared by plasma rotating electrode process (PREP), then TC4 alloy components were laser cladding repaired with the powder. The results indicate that the introduction of yttrium (Y) induces Y2O3 dispersion evenly distributed on the powder, as the Y content increases, Micro Vickers hardness of the powder rises. In the TC4-xY cladding layers, the Micro Vickers hardness rises with the increase of Y content. However, because of the excessive precipitation of brittle phase, the tensile property of the cladding layers shows a trend from rise to decline, then the elongation just shows the reverse trend. The 1058 MPa tensile property of the TC4-0.3Y cladding layer is the most excellent, then its 7.2% elongation is the worst. The regulation of Y content is conducive to improving the tensile strength of the cladding layer.
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图 1 (a)等离子旋转电极雾化设备；(b)钛合金铸锭；(c)钛合金棒料；(d)钛合金粉末
Figure 1. (a) Plasma rotating electrode atomization equipment; (b) Titanium alloy ingots; (c) Titanium alloy bar stock; (d) Titanium alloy powder
图 3 (a) 激光熔覆过程示意；(b)TC4基板；(c)激光熔覆后形貌；(d)熔覆过程图解
Figure 3. (a) Schematic diagram of the laser cladding process; (b) TC4 substrate; (c) Laser cladding topography; (d) Illustration of the cladding process
图 6 TC4-xY(x= 0，0.1，0.3，0.5)粉末表面的扫描电镜形貌
Figure 6. SEM of the TC4-xY (x= 0,0.1,0.3,0.5) surface topography
图 8 TC4-xY(x= 0，0.1，0.3，0.5)合金熔覆层的光镜
Figure 8. OM of TC4-xY (x= 0,0.1,0.3,0.5) alloy cladding layer
图 9 TC4-xY(x= 0，0.1，0.3，0.5)合金熔覆层的扫描电镜形貌
Figure 9. SEM of TC4-xY (x= 0,0.1,0.3,0.5) alloy cladding layer
图 11 (a) TC4-xY(x= 0，0.1，0.3，0.5)合金的显微硬度; (b) TC4-xY(x= 0，0.1，0.3，0.5)合金的拉伸曲线
Figure 11. (a) Micro Vickers hardness of TC4-xY (x= 0,0.1,0.3,0.5) alloy; (b) Tensile Stress-strain curve of TC4-xY (x= 0,0.1,0.3,0.5) alloy
图 12 TC4-xY(x= 0，0.1，0.3，0.5)合金的拉伸断口形貌
Figure 12. Tensile fracture topography of TC4-xY (x= 0,0.1,0.3,0.5) alloy
表 1 TC4-0.5Y粉末表面分散相和基体EDS点分析元素含量
Table 1. Elements content of dispersion and matrix EDS point analysis on TC4-0.5Y powder
元素 y/% 弥散相 基体 Al 8.32 9.70 Ti 69.43 82.23 V 2.60 3.60 O 18.18 4.25 Y 1.47 0.22 总量 100.00 100.00 
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