Research of Laser Cladding with SiC-316L Composite Coating on AZ31 Alloy

Abstract

Laser cladding is an advanced material processing technology that has potential to improve the performances of metals. To improve the hardness and wear resistance of the surface of Magnesium alloy, SiC-316L composite coating on AZ31 magnesium alloy by laser cladding was generated, and the composition and properties analysis of the cladding coating were conducted. The results show that the laser cladding coating and the substrate achieve a good metallurgical bonding. The growth morphology of boundary is mainly branch dendrite.When the laser power is 1250 W, spot diameter is 2mm, scanning speed is 25 mm/s and average energy density is 2.5×104J, the cladding layer possesses the best micro-hardness, about 3 times as hard as the substrate.