Abstract
Laser hardfacing Tungsten Carbide was fabricated on 316 stainless steel surfaces using a synchronization powder feeding technique by 4 kW Diode laser (co axial laser) apparatus. An attempt has been made to optimizing the process parameters of laser such as Laser Power (P), Travel Speed (T), Defocusing Distance (D) and Powder feed rate (F). The influence of the processing variables on corrosion rate is discussed. The experiments were conducted using design matrix based on a four factor and five level central composite rotatable design. An empirical relationship was developed to predict the corrosion rate of Tungsten carbide hardfaced layer using response surface methodology (RSM) technique. The optimized parameters and the influenced parameter were identified. The interaction effects of input process parameters of laser hardfacing were discussed. The corrosion properties were analyzed by Pitting corrosion method. The pitting method results show that the hardfacing is mainly to increase the corrosion resistance. With the increase of laser power, corrosion resistance and micro hardness of the hardfaced surface have been improved.
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