退火温度对激光沉积TA15合金组织及性能的影响

以TA15钛合金球状粉末为原料，利用激光沉积制造技术制备了TA15钛合金厚壁件。研究了不同的退火温度对激光沉积TA15钛合金的拉伸力学性能及显微组织的影响，分析了经不同温度退火后合金的断裂机理以及晶界两侧α团簇的变形机制。结果表明，经退火处理后的合金显微组织中α相排列有序，α片层厚度随退火温度的变化不大；显微硬度值受α相含量影响，但随退火温度变化不大；晶界两侧α团簇变形机制不同；裂纹易在β相处萌生并扩展；沿着沉积方向和垂直于沉积方向上的合金拉伸断裂机制不同，分别为韧性断裂和半韧性半解理断裂。

Abstract

TA15 titanium alloy bulk specimens are prepared from raw material of spherical powders by laser deposition manufacturing technique. The effect of annealing temperature on the tensile mechanical properties and microstructure characteristics of TA15 titanium alloys is investigated, and the fracture mechanism and α group deformation mechanism on both sides of grain boundary under different annealing temperatures are analyzed. The results indicate that, the α phase in alloy microstructure is in order after the annealing treatment, and the thickness of α lamellar layer does not change so much as the annealing temperature increases; the micro-hardness is affected by the amount of α phase while it does not vary much with temperature; the α group deformation mechanisms on both sides of grain boundary are different; the crack easily appears and extends in β phase; the tensile fracture mechanism along deposition direction is different from that along perpendicular direction and the former is ductile fracture but the latter is semi-cleavage-ductile fracture.

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