Parameters and Behaviour of NiCrFeSiB Laser Cladding in Overlapped Geometry

Abstract

This paper addresses the laser cladding of Ni17Cr4Fe 4Si3.5B1C powder in overlapped tracks geometry. Different process parameters like laser power, cladding speed, and powder feed rate are designed in order to obtain defect-free deposition and for enhancing the hardness of the cladding layers. In transversal sections, the microstructure aspects of the cladding layers reveal the geometry and orientation of the dendrites, with different crystal morphology and size, depending on the used parameters. The study demonstrates that laser cladding is a complex process that is directly influenced by technological parameters. The Taguchi design of experiments reveals that powder feed rate has the most influence on the laser cladding layer geometry and mechanical proprieties.