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首页> 外文期刊>Journal of Materials Engineering and Performance >Laser Powder Deposition Parametric Optimization and Property Development for Ti-6Al-4V Alloy
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Laser Powder Deposition Parametric Optimization and Property Development for Ti-6Al-4V Alloy

机译：激光粉末沉积参数优化和Ti-6Al-4V合金的性能开发

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摘要

In this study, Ti6Al4V alloy was produced via laser powder deposition (LPD). To obtain Ti6Al4V alloy with maximum density, LPD parameters for preparing Ti6Al4V samples were optimized using the Taguchi method. Results were analyzed on the basis of the signal-to-noise (S/N) ratios and analyses of variance. A high energy density should be used to achieve higher levels of densification. The optimal combination of parameters for density was a scanning speed of 550mm/min, laser power of 160W, powder feeding rate of 0.99g/min, and shield gas flow of 8 L/min. An almost fully dense Ti6Al4V sample was prepared using the optimized LPD process, and the relative density was greater than 99%. In addition, the microstructure and properties of Ti6Al4V samples prepared by optimized LPD process were investigated. The microstructure investigation revealed that the LPD-prepared Ti6Al4V sample was predominantly composed of fine acicular phase and lath-type phase. Tensile and microhardness tests indicated that the LPD sample had higher mechanical properties than the traditional cast Ti6Al4V alloy because of the acicular martensitic phase and smaller grain size.
机译：在该研究中，通过激光粉末沉积（LPD）产生Ti6Al4V合金。为了获得具有最大密度的Ti6Al4V合金，使用Taguchi方法优化了用于制备Ti6Al4V样品的LPD参数。基于信号对噪声（S / N）比率分析结果和方差分析。高能量密度应使用高能量密度来实现更高水平的致密化。密度参数的最佳组合是扫描速度为550mm / min，激光功率为160W，粉末进给速率为0.99g / min，屏蔽气流为8升/分钟。使用优化的LPD工艺制备几乎完全致密的Ti6Al4V样品，相对密度大于99％。另外，研究了通过优化的LPD工艺制备的Ti6Al4V样品的微观结构和性质。微观结构研究表明，LPD制备的Ti6Al4V样品主要由细心的相和板条型相连组成。拉伸和微硬度试验表明，由于针状马氏体相和粒径小，LPD样品具有比传统铸造Ti6Al4V合金更高的机械性能。

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