Laser Cladding of PAC ۷۱۸, Tribaloy T-۷۰۰ and METCO ۴۱ C Hard Facing Powders on AISI SS ۳۰۴L Substrate

The present investigation aims to deposit the three different hard facing powder (Triboloy T-۷۰۰ and PAC ۷۱۸, and TETCO ۴۱ C) on SS ۳۰۴L using laser cladding technique. The single and overlapped clad track was deposited using ۲ kW laser power system. The optimized laser process parameters and ۵۰% overlap clad track was used to deposit a large surface area. The optimum laser process parameters were finalised using single clad structure study.  The cross-sections of the clad layers were used to obtain the microstructure and micro-hardness from different regions namely, clad layer, diffusion layer, and substrate. Throughout the study, the laser power was kept constant i.e. ۱.۲ kW. For single clad deposition, the scanning speed and powder feed rate varied from ۰.۳ to ۰.۵ m/min and ۴ to ۹ g/min, respectively. T-۷۰۰ and PAC ۷۱۸ shows uniform developing micro-structure while METCO ۴۱ C shows the development of mixed dendritic and cellular type microstructure. The Triboloy shows the maximum surface hardness of ۵۳۴ Hv, ۳۲۱ Hv for PAC ۷۱۸, and ۲۹۴ Hv for METCO ۴۱ C.

Keywords:

Fiber laser , Laser Cladding , Clad Properties , Micro-hardness , Hard Powder and SS۳۰۴L