
热处理对激光选区熔化TA15组织性能的影响
王猛, 赵琳瑜, 刘喜旺, 陈志旋, 张立平, 吴军
热处理对激光选区熔化TA15组织性能的影响
Effect of heat treatment on microstructure and properties of selective laser melting TA15 alloy
为了提高选区激光熔化TA15合金试样的综合力学性能,本研究开展了选区激光熔化 (selected laser melting,SLM)TA15合金在800 ℃+空冷、950 ℃+空冷和1050 ℃+空冷退火条件下的组织和力学性能研究。利用电子背散射衍射表征了不同状态TA15合金组织结构特征。结果表明,800 ℃和950 ℃热处理未明显改变α相的取向和织构,呈现网篮组织结构特征;1050 ℃热处理后,沿[0001]方向出现最大强度为9.18的织构,呈现魏氏体组织特征。随着退火温度的升高,α′/α相的宽度逐渐增加,长宽比先上升后下降,α′/α相内几何必要位错密度逐渐降低。试样维氏硬度值先下降、后上升,未热处理态试样维氏硬度值最大,为(397.2±10)HV。随着退火温度的升高,TA15试样强度逐渐下降,伸长率先上升后下降。未热处理态拉伸试样呈现混合断裂特征;800 ℃和900 ℃热处理试样呈现塑性断裂特征;1050 ℃热处理试样为脆性断裂。
To improve the comprehensive mechanical properties of selective laser melting (SLM) TA15 alloy, the microstructure and mechanical properties of SLM TA15 alloy are studied under annealing conditions of 800 ℃+air cooling, 950 ℃+air cooling, and 1050 ℃+air cooling. The microstructure characteristics of TA15 alloy under annealing conditions are characterized by electron backscatter diffraction. The results show that the orientation and texture of the α phase are not changed after the heat treatment at 800 ℃ or 950 ℃, showing the characteristics of a net basket structure. After the heat treatment at 1050 ℃, the texture with the maximum strength of 9.18 appears along the direction [0001], showing the characteristic of the weistenite structure. With the increase of annealing temperature: the width of both α' and α phase increases gradually; the aspect ratio of both α' and α phase increases first and then decreases; the geometrically necessary dislocation density of both α' and α phase decreases gradually; the Vickers hardness of the sample decreases first and then increases, with the highest Vickers hardness of (397.2±10)HV for the unheat treated sample; the strength of TA15 sample decreases gradually; and the elongation increases first and then decreases. After tensile tests, the unheat treated samples show mixed fracture characteristics, the samples treated at 800 ℃ and 900 ℃ show plastic fracture characteristics, and the sample treated at 1050 ℃ show brittle fracture characteristics.
选区激光熔化 / 热处理 / TA15 / 显微组织 / 力学性能
selective laser melting / heat treatment / TA15 / microstructure / mechanical property
TG146.2 / TB31
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