Title: Parametric effect on machining characteristics of laser machined Al7075-TiB₂ in-situ composite

Authors: R. Keshavamurthy; S. Manjoth; G.S. Pradeep Kumar; J.T. Kavya

Addresses: Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bengaluru-560078, India ' Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bengaluru-560078, India ' Department of Automobile, Engineering, Christ (Deemed to be University), Bengaluru-560078, India ' Department of Mechanical Engineering, Dayananda Sagar College of Engineering, Bengaluru-560078, India

Abstract: The effect of laser parameters on the machining characteristics of an Al7075 based in-situ metal matrix composite reinforced with Titanium diboride(TiB₂) is investigated. The cutting speed (at 1000-1200 m/hr), stand-off distance (SOD) (0.3-0.5 mm), and gas pressure (0.5-0.7 bar) were studied. Scanning electron microscopy (SEM) was used to validate the machining behaviour of in-situ composites. Surface roughness and dimensional error decrease as the SOD increases up to 0.4 mm, but both increases as the SOD increases to 0.5 mm. whereas the volumetric material removal rate (VMRR) increases up to 0.4 mm SOD and then decreases as SOD increases (0.5 mm). Surface roughness, VMRR, and dimensional error were all found to increase with laser speed. Surface roughness and dimensional error increase as gas pressure increase up to 0.5 bar, then decreases. The VMRR, on the other hand, increased continuously as the assist gas pressure increased.

Keywords: in-situ composite; laser machining; Al7075 alloy; SOD; stand-off distance; cutting speed and gas pressure.

DOI: 10.1504/IJCMSSE.2021.121374

International Journal of Computational Materials Science and Surface Engineering, 2021 Vol.10 No.3/4, pp.165 - 183

Published online: 07 Mar 2022 *

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