Effect of ultrasonic vibration-assisted laser surface melting and texturing of Ti-6Al-4V ELI alloy on surface properties

doi:10.1016/j.jmst.2018.09.057

材料科学与技术 ›› 2019, Vol. 35 ›› Issue (2): 295-302.DOI: 10.1016/j.jmst.2018.09.057

收稿日期:2018-02-20 修回日期:2018-03-27 接受日期:2018-03-27 出版日期:2019-02-05 发布日期:2018-12-21

Effect of ultrasonic vibration-assisted laser surface melting and texturing of Ti-6Al-4V ELI alloy on surface properties

Sourabh Biswas^a, S. Habib Alavi^a, Bhishma Sedai^b, Frank D.Blum^b, Sandip P.Harimkar^a^*()

^aSchool of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078, USA
^bDepartment of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA

Received:2018-02-20 Revised:2018-03-27 Accepted:2018-03-27 Online:2019-02-05 Published:2018-12-21
Contact: P.Harimkar Sandip
About author:
These authors contributed equally to this work.

摘要/Abstract

Abstract:

Ultrasonic vibration-assisted laser surface processing that involves application of vertical ultrasonic vibrations to the Ti-6Al-4V alloy substrates while being irradiated with a CO₂ laser was performed for the development of laser melted and textured surfaces with potential applications in biomedical implants. The laser processing resulted in very consistent repeating undulating grooved surfaces, and the undulations were significantly more pronounced in the samples processed with higher ultrasonic power outputs. The phase evolution, studied by x-ray diffraction, confirmed that the laser processing triggered transformation of globular α → acicular α and martensitic α' as well as increased amounts of retained β phases, which were also reflected in the microscopic analysis. The surface texture developed by laser processing resulted in increased surface wettability with increasing ultrasonic power output. The textured surfaces exhibited marked decrease in coefficients of friction during sliding wear testing performed under simulated body fluid due to lubricant entrainment within the textured grooves. The texturing also resulted in significant reduction in surface contact area during the wear process, which considerably reduced the overall wear rates due to abrasive wear.

Key words: Laser texturing, Laser melting, Ultrasonic vibrations, Wear

. [J]. 材料科学与技术, 2019, 35(2): 295-302.

Sourabh Biswas, S. Habib Alavi, Bhishma Sedai, Frank D.Blum, Sandip P.Harimkar. Effect of ultrasonic vibration-assisted laser surface melting and texturing of Ti-6Al-4V ELI alloy on surface properties[J]. J. Mater. Sci. Technol., 2019, 35(2): 295-302.

图/表 10

Fig. 1. Schematic of experimental setup used to perform ultrasonic vibration-assisted laser surface processing.

Fig. 2. Low magnification surface micrographs and corresponding three-dimensional and 2-dimensional surface profiles for (a) AR, (b) LM, (c) ULM30, and (d) ULM40 specimens. The insets in (a) and (b) show magnified two-dimensional surface profiles.

Fig. 3. XRD patterns of AR, LM, ULM30, and ULM40 specimens.

Fig. 4. Low magnification cross-sectional micrographs of (a) LM, (b) ULM30, and (c) ULM40 samples.

Fig. 5. Microstructures of (a) AR, (b) LM, (c) ULM30, and (d) ULM40 samples; the lower magnification microstructures are provided in the insets.

Fig. 6. Contact angles of water droplets for AR, LM, ULM30, and ULM40 samples.

Fig. 7. Hardness variation with depth for LM, ULM30, and ULM40 samples.

Fig. 8. Variation of the coefficient of friction (μ), with time for (a) AR, (b) LM, (c) ULM30, and (d) ULM40 samples.

Table 1 Wear rate and mean coefficient of friction (COF) in as received and laser processed samples.

Specimens	Wear rate (μg N^-1 m^-1)	Mean COF
AR	4.4	0.359
LM	2.4	0.173
ULM30	2	0.311
ULM40	1.4	0.231

Fig. 9. Scanning electron micrographs of wear scars of (a) AR, (b) LM, (c) ULM30, and (d) ULM40 samples.

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Effect of ultrasonic vibration-assisted laser surface melting and texturing of Ti-6Al-4V ELI alloy on surface properties

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