Grade 315 steel (Fe-2.9 Cr--1.7 W- 0.7 Mo -0.3 Mn-0.3 Si-0.2 V- 0.1 Ni-0.13 C-0.01 N) was chromized by the halide-activated pack cementation (HAPC) process. Key process parameters, i.e., coating temperatures and pack compositions, were investigated. Ammonium chloride-activated packs in the 700-1000°C range produced coatings nominally in the 1-8 μm range, as determined by optical and scanning electron microscopy (SEM). Coatings applied in the 900-1000°C temperature range resulted in Cr-rich coatings. The predominant phase in the coating was identified as Cr23C6 by X-ray diffraction. In addition, the presence of chromium nitride, Cr2N, was observed in the coating.

Subject
Scanning electron microscopy, X-ray diffraction, Coatings, Materials, Composition, Chromium, Ammonium, Coating thickness, Powders, Steel, Activators, Cementation, Samples
Keywords:
Halide-activated pack cementation, grade 315 steel, coatings, chromizing, corrosion, super-bainitic steel
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2011
Association for Materials Protection and Performance (AMPP)
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