Laser Alloying of the Surface Layer of Al4.5Cu1Si Alloy with TiC and WC Particles

Abstract

The surface layer of the samples of Al4.5 %Cu1.0% Si alloy was developed by CO 2 laser using TiC and WC particles. Because the oxide film on the surface it was impossible to introduce the TiC particles into the melt, as the WC particles could broken the oxide film and could penetrate to the melt. The microstructure of resolidified layers were cellular or dendritic with cast texture. The bands were overlaped and so the resolidified structure was partly heat treated. The carbide particles reacted with the melt.

In-situ synthesis of a carbide reinforced steel matrix surface nanocomposite by laser melt injection technology and subsequent heat treatment

“…During LMI hard particles with the size range of 10-100 µm are blown by a gas stream into a liquid metallic pool, melted by a fast moving laser beam. The particles are usually carbides [1,[8][9][10][11][12]14,[18][19][20][21][23][24][25][26][27][29][30][31][32][33][34][35][36][38][39][40][41][42][43], borides [3][4][5][6][7], nitrides [2], oxides [13,15]), or even soft Pb droplets [28].…”

“…Laser Melt Injection (LMI) technology has been known since the 1980s [1] and has been used to improve surface characteristics of metallic alloys, such as steels [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], aluminum [18][19][20][21][22][23][24][25][26][27][28], titanium [27,[29][30][31][32][33][34][35][36][37][38][39], nickel [40][41][42] and magnesium [43]. During LMI hard particles with the size range of 10-100 µm are blown by a gas stream into a liquid metallic pool, melted by a fast moving laser beam.…”