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首页> 外文期刊>Materials Science and Engineering >Microstructural and mechanical characterization of Ti6Al4V refurbished parts obtained by laser metal deposition
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Microstructural and mechanical characterization of Ti6Al4V refurbished parts obtained by laser metal deposition

机译：通过激光金属沉积获得的Ti6Al4V翻新零件的微观结构和力学特性

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摘要

Thin sections of Ti6Al4V based aeroengine structural material was refurbished using laser metal deposition (LMD) technique. The thermal gradient and cooling rate was strategically controlled through the appropriate selection of laser process parameter such as laser power, scan speed and powder feeding rate. At a laser power of 1500 W and at a scan speed of 600 mm/min, the deposited layer is free of cracks and pores with good metallurgical bonding to the substrate as well as between the layers. The β to α' martensite phase transformation was prevalent in the deposited region which marginally increased the hardness. The ultimate tensile strength (UTS) of LMD was found to be 900 MPa which is slightly lower than the base UTS of 950 MPa. The LMD fails due to brittle fracture with traceable elongation.
机译：使用激光金属沉积（LMD）技术翻新了基于Ti6Al4V的航空发动机结构材料的薄截面。通过适当选择激光加工参数（例如激光功率，扫描速度和送粉速度），可以策略性地控制热梯度和冷却速率。在1500 W的激光功率和600 mm / min的扫描速度下，沉积的层无裂纹和孔，并且与基底以及各层之间具有良好的冶金结合。 β到α'马氏体相变在沉积区域中普遍存在，这在一定程度上增加了硬度。发现LMD的极限拉伸强度（UTS）为900 MPa，略低于950 MPa的基本UTS。由于脆性断裂和可追溯的伸长，LMD失效。

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