000			03206nam a2200373 i 4500
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003			MY-KuUP
005			20251125110741.0
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007			ta
008			230615t20232023my a|||fr|||| 000 0 eng d
020			_aTHE0009475 (Local) _qHardback
040			_aUMP _beng _cUMP _erda
090			_aFTKMA .A457 2023 r Thesis
100	1		_aAmira Qistina Syamimi Zaifuddin, _eauthor.
245	1	0	_aImprovement of laser heating efficiency by laser surface modification on titanium alloy / _cAmira Qistina Syamimi Zaifuddin
264		1	_aPahang : _bUMP, _c2023
264		4	_c© 2023
300			_axiii, 88 pages : _e1 CD ROM _bIllustration ; _c30 cm.+
336			_2rdacontent _atext
336			_2rdacontent _atext
337			_2rdamedia _aunmediated
337			_2rdamedia _acomputer
338			_2rdacarrier _avolume
338			_2rdacarrier _acomputer disc
347			_2rda _atext file _bPDF
500			_aFaculty of Mechanical & Automotive Engineering Technology
502			_aThesis (Master of Science) -- Universiti Malaysia Pahang – 2023
504			_aIncludes bibliographical reference
520	3		_aSince its inception, the employment of titanium alloys in laser heating applications have drawn a great deal of interest among industries and researchers especially in biomedical application. However, due to weak laser-metal interaction caused by metal’s low energy absorptivity, high laser power consumption is required during laser heating applications like laser brazing and laser welding. This is because high laser power usage will compensate for the low process efficiency. Nevertheless, this limitation could be overcome by increasing the titanium’s surface roughness via laser surface modification (LSM); Hence, the interaction can be strengthened, thus resulting in high efficiency and low power requirements for laser heating process. In the present work, LSM experiment was carried out to increase the surface roughness of Ti6Al4V. The surface of titanium alloy was modified with variable laser power, scan speed, and frequency at range of 15 W – 27 W, 250 mm/s – 450 mm/s, and 10 kHz – 50 kHz, respectively. Afterwards, the surface was characterized via 3D optical microscope, SEM, and EDX analysis. Then, the surface was heated using low laser power in order to analyze the effect of surface roughness towards process efficiency. The result showed that highest laser power (27 W) accompanied by lowest scan speed (250 mm/s) and lowest pulse frequency (10 kHz) produced the highest surface roughness value of 32.73 μm. Additionally, the subsurface structural analysis revealed that material removal and redeposition were presented during LSM process, which increased the surface roughness. Besides, the laser heating process efficiency was elevated up to 37% when the modified surface was heated. Overall, this thesis presents promising ways to improve the efficiency of laser heating process through changes in surface roughness induced by LSM.
610	2	0	_aFaculty of Mechanical & Automotive Engineering Technology _xDissertations
650		0	_aUniversities and colleges _xDissertations
650		0	_aThesis _xDissertations
942			_2lcc _cTHESIS