Parametric effect on machining characteristics of laser machined Al7075-TiB2 in-situ composite Online publication date: Mon, 07-Mar-2022
by R. Keshavamurthy; S. Manjoth; G.S. Pradeep Kumar; J.T. Kavya
International Journal of Computational Materials Science and Surface Engineering (IJCMSSE), Vol. 10, No. 3/4, 2021
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.
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