Study of mechanical and tribological properties of Ti–6Al–4V alloy fabricated by powder bed fusion laser beam

Abstract

Powder bed fusion laser beam, as one of the most promising forming technologies, offers unmatched benefits over traditional processing, particularly in the production of Ti-6Al-4V. The influence of laser line energy density (LLED) on the forming surface, phase composition, micro-hardness, tensile characteristics and wear resistance of Ti-6Al-4V alloy were explored to disclose the evolution of mechanical and tribological properties. According to the findings, the LLED causes 'depressions' and 'highlands' between nearby scanning tracks. The phase composition did not alter appreciably as LLED increased. Micro-hardness and tensile characteristics increased initially, then declined, and the value of maximum micro-hardness and ultimate tensile strength were 388.17 HV 0.2 and 1197.5 MPa, respectively. Furthermore, when the LLED is 0.24 J mm -1 , the wear resistance is optimal under the aviation lubricant medium, with an average friction coefficient of 0.1505 and volume wear rate of 6.95 * 10 −8 mm 2 * N −1 , and a wear mechanism of mild furrow wear and adhesion wear.

Study on Morphology, Microstructure, and Tribo‐Corrosion Behavior of Laser‐Powder‐Bed‐Fusion‐Fabricated Titanium Alloy

“…This is closely related to the increase of input energy and temperature, and has been verified in Shi's research. [ 28 ] To further quantify and evaluate the microstructure growth status, the Image‐Pro Plus software was used to further characterize the grain size of the microstructure, as shown in Figure 2a1–e1. The length (Figure 2a2–e2) and width (Figure 2a3–e3) of the acicular martensite were statistically analyzed.…”