Fatoba O S, Akinlabi E T, Akinlabi S A, Obiegbu M C
Department of Mechanical Engineering Science, University of Johannesburg, South Africa.
Department of Mechanical Engineering, Covenant University, Ota-Ogun State, Nigeria.
Data Brief. 2019 Mar 7;23:103724. doi: 10.1016/j.dib.2019.103724. eCollection 2019 Apr.
This study investigated the metallurgical, mechanical properties and quality of coatings fabricated by direct laser metal deposition (DLMD) on Ti-6Al-4V, which were affected by the DLMD optimized process parameters. A 3-kW continuous wave ytterbium laser system (YLS) attached to a KUKA robot was used for the process. An analysis was conducted to determine the quality of the coatings in terms of hardness and wear resistance. Variables such as the time of interlayer deposition, thickness of the substrate, the initial temperature of the substrate, and the number of deposited layers were also investigated. The independent/collective effect that each process parameter had on the metallurgical and mechanical properties of the deposited Ti-6Al-4V were made clear when the processing parameters were varied. Minute pores/defects that significantly affect the metallurgical and mechanical properties of clads were also identified. The results obtained from the designed experiments showed that the depth of Heat Affected Zone (HAZ) was inversely proportional to the thickness of the substrate; as the thickness of the substrate was increased, the HAZ depth decreased. Moreover, the intensity of the laser power also affects the HAZ depth. In addition, it was discovered that the initial conditions of the substrate at room temperature also affected the coatings in relation to pre-heated conditions. The analysis conducted in identifying and quantifying the porosity showed indication that the factors such as scanning speed, laser power and powder feed rate had a predominant influence on the porosity. The grain form and structure as well as the mechanical properties of the cladded layer were significantly affected by the optimized process parameters of DLMD process. The parameters investigated had a significant impact on the hardness and wear resistance performance. Furthermore, the results revealed that the highest hardness of one of the coatings was 1.97-times the substrate which had a hardness value of 302 HV. The outstanding wear resistance performance of Al-Si-Sn-Cu/Ti-6Al-4V composite coating is attributed to major hard intermetallic phases.
本研究调查了通过直接激光金属沉积（DLMD）在Ti-6Al-4V上制备的涂层的冶金性能、力学性能和质量，这些性能受DLMD优化工艺参数的影响。使用了一个连接到库卡机器人的3千瓦连续波镱激光系统（YLS）进行该工艺。进行了一项分析，以根据硬度和耐磨性确定涂层的质量。还研究了诸如层间沉积时间、基材厚度、基材初始温度和沉积层数等变量。当改变工艺参数时，明确了每个工艺参数对沉积的Ti-6Al-4V的冶金和力学性能的独立/综合影响。还识别出了对熔覆层的冶金和力学性能有显著影响的微小孔隙/缺陷。从设计实验中获得的结果表明，热影响区（HAZ）的深度与基材厚度成反比；随着基材厚度的增加，HAZ深度减小。此外，激光功率强度也会影响HAZ深度。另外，发现室温下基材的初始条件相对于预热条件也会影响涂层。在识别和量化孔隙率方面进行的分析表明，扫描速度、激光功率和粉末进给速率等因素对孔隙率有主要影响。DLMD工艺的优化工艺参数对熔覆层的晶粒形态和结构以及力学性能有显著影响。所研究的参数对硬度和耐磨性能有显著影响。此外，结果表明，其中一种涂层的最高硬度是硬度值为302 HV的基材的1.97倍。Al-Si-Sn-Cu/Ti-6Al-4V复合涂层出色的耐磨性能归因于主要的硬金属间相。
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