Experimental investigation on erosion resistance of ss316 substrate coated with tical2o3 nanocomposite by laser cladding

Abstract

Erosion is a phenomenon in which mechanical degradation of material takes place when the material is subjected to a stream of erodent element impinging on its surface. The erosion is a severe problem in various engineering applications like Fluidized Bed Combustion (FBC) systems, steam turbines, jet turbines, pipelines, valves, etc. The materials used for engineering applications need high surface resistance properties in terms of wear and erosion. Saving a material from erosion is an important task for engineering application. Laser coating is a process in which surface properties of the various materials can be improved, mainly hardness and wear resistance, with a material which has different metallurgical properties than the base material.Hence the present research is carried out to improve the erosion resistance of the base material. Here in this research work the erosion behaviour of SS316 substrate is studied. Erosion rate of SS316 substrate as it is received from the supplier, erosion rate of the same substrate coated with two different combinations of TiC and Al2O3 nano composite is studied. The coating is carried out by laser cladding technique. Coating is deposited on to the base materials in two different combinations of nano particles, namely 75% TiC - 25% Al2O3 and 80% TiC - 20% Al2O3. Standard samples are prepared for 25 mm x 25 mm x 5 mm dimensions. Surface characterization process is carried out to examine the specimens for the study of erosion behaviors. The solid particle erosion test was performed on Air Jet Erosion Tester as per ASTM- G76. The erosion behavior of uncoated and coated SS316 has been evaluated at the impact velocities of 32 m/sec, 40 m/sec, 48 m/sec and 56 m/sec, with impact angles of 30°, 45°, 60° and 90°. newline