ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Laser irradiating process with Nd-YAG laser is investigated in order to improve theadhesion and wear resistance of low pressure plasma sprayed layer on the surface of aluminumextruded shape using the atomized powder of Al-50mass%Fe, Al-15mass%Fe-17mass%Si andAl-50mass%Si. The effect of pulse energy of laser beam on the microstructure, micro hardnessand wearing rate of these laser irradiated layers are evaluated. Laser irradiated layers haveappeared more smooth surface and better adhesion than as sprayed layer. Depth profile of microhardness where laser irradiated is respectively kept constant. In the microstructure of laserirradiated layer of Al-50mass %Fe, fine needle-like Al3Fe and massive Al2Fe are dispersed. Microhardness increases with decrease of the pulse energy of laser beam However, the wearing rate oflaser irradiated layer increases due to the initiation of cracking. In the microstructure of laserirradiated layer of Al-15mass%Fe-17mass%Si, ultra fine needle-like and massive (Al, Fe, Si)ternary crystals are aggregated. In the microstructure of laser irradiated layer of Al-50mass%Si,ultra fine hyper-eutectic structure is observed. Micro hardness of these layers are HV250-350,HV150-200, respectively and wearing rate of these layer are 1/7 or less than anodized surface
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.404.pdf
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