Chromized/siliconized diffusion coatings for iron-base alloy by pack cementation
- Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
This paper reports that the co-deposition of chromium and silicon into a 2.25Cr-1.0Mo-0.15C steel, alloy 800, and type 304 stainless steel has been achieved using the pack cementation process. The ferritic coating produced on the 2.25 Cr-1.0Mo steel was approximately 225 {mu}m (9 mils) thick, whereas the inward diffusion of chromium and silicon produced a two-phase structure of ferrite and austenite for type 304. Chromium and silicon were incorporated into the austenitic solid solution upon diffusion into alloy 800. All coatings had approximately 25 to 35 wt% Cr and 2 to 3% Si at the surface. Cyclic oxidation testing in air of the coated 2.25Cr-1.0Mo steel (T = 700{degrees} C) and type 304 (T = 1035{degrees} C) showed a dramatic decrease in the oxidation kinetics compared to the original uncoated alloys. The cyclic oxidation of alloy 800 was also improved.
- OSTI ID:
- 7238129
- Journal Information:
- Materials Performance; (United States), Journal Name: Materials Performance; (United States) Vol. 30:9; ISSN 0094-1492; ISSN MTPFB
- Country of Publication:
- United States
- Language:
- English
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ALLOY-FE46NI33CR21
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
AUSTENITIC STEELS
CEMENTING
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COATINGS
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
DIFFUSION
ELEMENTS
FERRITIC STEELS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
METALS
NICKEL ALLOYS
OIL WELLS
OXIDATION
PERFORMANCE TESTING
PROTECTIVE COATINGS
SEMIMETALS
SILICON
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
TESTING
TITANIUM ADDITIONS
TITANIUM ALLOYS
TRANSITION ELEMENTS
WELLS