Taguchi Approach for the Optimization of Process Parameters of Wear in AISI 202 Tested at Elevated Temperature


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Abstract


Taguchi method has been a successful technique in improving the product quality and process performance for the past couple of decades.  The present study optimizes the wearing rate of AISI 202. Since the price of nickel is so high, low nickel or non-nickel grade stainless steel is recommended to design the product. Dry sliding wear test was conducted to understand the wear and friction characteristics of samples. The tests were carried out in a purpose built-in vacuum pin-on-disc tribometer capable of testing the material up to a temperature 1000˚C and in vacuum. Relationships between the weight loss and applied load, time in seconds and friction coefficient were established. It was observed that reduction in the applied load reduces the friction factor and reduction in load reduces the weight loss. Also, the friction coefficient reduces when temperature increases, for all the parameters considered. The design of experiment approach was employed to determine the optimal combination of the testing parameters in a controlled way using Taguchi method for minimum wear rate. An orthogonal array and signal-to-noise ratio were employed to investigate the wear behaviour of AISI 202. The confirmation test was conducted to verify the experimental results. SEM images have been taken for certain wear specimens and the observations have been reported in this paper. The morphology of the worn surface was examined using scanning electron microscope and the micro-structure of the sub surface is also studied. It is observed that at temperatures above 400˚C, this material exhibits adhesive wear and the evidence of self-welding of mating parts has been observed in microstructures. It is also observed that the SS202 undergoes shear deformation during sliding wear
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Keywords


Wear; Elevated Temperature; SEM; Tribo-Graphs; Micro-Delamination; Taguchi Method; Orthogonal Array; S/N Ratio

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