The primary focus of this research was to investigate the effect of different process parameters on the microstructure of aluminide coatings applied to austenitic stainless steels using the halide activated pack cementation (HAPC) process. The stainless steels studied included: UNS S30400, S31000, and S31600. The austenite stabilities for the different stainless steels were established by calculating the austenite stability indices using experimentally determined alloy compositions. Coating thicknesses were plotted as a function of temperature and time to establish the kinetics of the coating process for each type of stainless steel, which were determined to be parabolic. The thickness of the coatings was found to be inversely related to the austenite stability. Insights into the coating mechanism are discussed with relevance to the stability of the austenite matrix.

Subject
Stability, Coatings, Materials, Substrates, Halides, Thickness measurement, Constants, Coating thickness, Aluminides, Steel, Stainless steel, Nickel, Austenite
Keywords:
Halide Activated Pack Cementation, Aluminizing, Austenite, Stability, Steel
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2014
Association for Materials Protection and Performance (AMPP)
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