Selective laser melting of titanium alloy with 50 wt% tantalum: Effect of laser process parameters on part quality

By Swee Leong Sing, Florencia Edith Wiria, W. Y. Yeong. International Journal of Refractory Metals and Hard Materials, 2018

144 citations recorded by the source corpus.

Abstract Selective laser melting (SLM) is a powder bed fusion additive manufacturing (AM) technique that produces three-dimensional (3D) parts by fusing metallic powders with a high-energy laser. SLM involves numerous process parameters that may influence the properties of the final parts. Hence, establishing the effect of the SLM processing parameters is important for producing parts of high quality. In this study, titanium-tantalum alloy was fabricated by SLM using a customized powder blend to achieve in situ alloying. The influence of processing parameters on the microstructure and properties such as relative density, microhardness and surface roughness was investigated. The results show that fully dense titanium-tantalum parts can be obtained from SLM. With laser power of 360 W, scan speed of 400 mm/s, powder layer thickness of 0.05 mm and hatch spacing of 0.125 mm, the titanium-tantalum alloy produced by SLM has relative density of 99.85 ± 0.18%. Despite the variation in process parameters, titanium-tantalum shows laminar β grains in random directions in both xy and yz-plane from optical microscope (OM) analysis in all the parts produced. This observation is further confirmed using x-ray diffraction (XRD).

Subfields: Automotive Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/b4df511a785fcc474c5932428b41d9821e19d963

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In Automotive Engineering

1. M. Mehrpouya
2. Chao Wei
3. Zhizhou Zhang
4. Lin Li
5. A. Gisario
6. A. Pinkerton

In Mechanical Engineering

1. M. Mehrpouya
2. Enrique J. Lavernia
3. Chao Wei
4. Zhizhou Zhang
5. Lin Li
6. Zhe Sun
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Citations in the corpus

• The Potential of Additive Manufacturing in the Smart Factory Industrial 4.0: A Review (2019, background): “On the other hand, the atmosphere of the chamber is controlled by purging some inert gases to minimize the oxidation process during melting and solidification of the powder [50].”
• Additive manufacturing of functionally graded materials: A review (2019, methodology): “This reduction of area approach has not been applied to SLM fabrication of homogenous materials such as Ti/Ta alloys [81].”
• An overview of laser-based multiple metallic material additive manufacturing: from macro- to micro-scales (2020, background): “On the other hand, Sing et al observed that a lower scanning speed can achieve higher relative density, while further reducing the scan speed leads to more large pores and unmelted particles in the samples resulted from the liquid drop splashed from the overheated melt pools [71].”