Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/3204

Title

Parametric study of laser cladding of AS21 magnesium alloy with aluminim silicon/ tungsten carbide powder

Author(s)

Brandt, Milan;  Durandet, Yvonne C.;  Jahedi, Mahnaz Z.;  Mandagie, Meity

Abstract

Magnesium alloys are of growing interest for a number of applications in the automotive industry. An impediment to their increased usage is the low resistance to both wear and corrosion compared to steel or aluminium due to its low hardness and chemical affinity for numerous elements respectively. This paper describes the results of experiments investigating Nd:YAG laser cladding of AS 21 magnesium alloy with a mixture of Aluminium Silicon (40% wt) and Tungsten Carbide (60% wt) powder to improve its wear properties. The effects of laser power, scan speed, powder feed rate and shielding gas on the clad layer thickness and its hardness were examined. The result indicates that for the processing speed of 200 mm/min and powder feed rate of 7.5 g/min, the thickness of the clad layer decreased from 1.7 mm to 0.3 mm when the laser power was reduced from 1.6 kW to 1.4 kW. That changing of the parameter also produced less porosity in the clad layer, while the quantities of microcracks remained the same. When the proce ssing speed was decreased from 300 mm/min to 200 mm/min at 7.5 g/min and 1.4 kW, the layer thickness increased from 0.8 mm to 1.7 mm. The clad layer produced has few microcracks. The hardness of the clad layer was up to 145 HV which was at least a factor of two greater than that of the AS 21 substrate (54 HV).

Publication type

Conference paper

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences

Source

132nd Annual Meeting & Exhibition of the Minerals, Metals & Materials Society (TMS), 2-6 March 2003, San Diego, California, pp. 81-87(7)

Publication year

2003

Publisher

TMS - The Minerals, Metals & Materials Society

ISBN

0873395336

Publisher URL

http://www.tms.org/Meetings/Annual-03/Annual03-techprogram.html