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首页> 外文期刊>Materials Science and Engineering >Effect of travel speed and sub-β transus post deposition heat treatments on thin Ti-6Al-4V laser wire deposits
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Effect of travel speed and sub-β transus post deposition heat treatments on thin Ti-6Al-4V laser wire deposits

机译：传播速度和亚β透射沉积后热处理对薄Ti-6Al-4V激光线沉积物的影响

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Annealing or HIP below the β transus temperature was found to coarsen the as-built developed microstructure while preserving the developed macro morphology of Laser Wire Deposition (LWD) buildups. Following these thermal cycles, a general decrease in strength along with an increase in elongation have been observed. However, no trends in the tensile results could be extracted due to the scattering of the results. An additional aging cycle substantially stabilized the developed results. Samples processed at 1.4 mm/s exhibited low strength hardly meeting any of the ASTM and AMS minimum requirements and a strong anisotropy in elongation with lower values when tested along the Z direction. Samples processed at 7.2 mm/s exhibited good strength meeting the minimum wrought requirements as set by AMS4911 while elongation showed an isotropic behavior. Hardness has been found to be mostly independent of the experienced sub-β transus post deposition heat treatment. Moreover, the grain boundary strengthening mechanism with regards to the α platelets thicknesses was found to be travel speed dependent.
机译：发现在低于β转变温度的温度下进行退火或HIP可以粗化已建成的已开发微结构，同时保留已开发的激光丝沉积（LWD）堆积的宏观形态。在这些热循环之后，已经观察到强度总体下降以及伸长率增加。但是，由于结果的分散，无法提取拉伸结果的趋势。额外的老化周期大大稳定了开发的结果。以1.4？mm / s的速度处理的样品表现出低强度，几乎不能满足ASTM和AMS的最低要求，并且在沿Z方向测试时，其伸长率具有很强的各向异性，且值较低。以7.2 mm / s的速度处理的样品表现出良好的强度，可以满足AMS4911设定的最低变形要求，而伸长率则表现出各向同性。已经发现，硬度主要与沉积后经历过的亚β-transus沉积热处理无关。此外，发现关于α片厚度的晶界强化机制是取决于行进速度的。

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