Oxidation of slurry aluminide coatings on cast stainless steel alloy CF8C-plus at 800 C in water vapor

J. A. Haynes; B. L. Armstrong; D. Kumar; S. Dryepondt; Y. Zhang

doi:10.1007/s11085-013-9378-y

Oxidation of slurry aluminide coatings on cast stainless steel alloy CF8C-plus at 800 C in water vapor

J. A. Haynes, B. L. Armstrong, D. Kumar, S. Dryepondt, Y. Zhang

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

A new, cast austenitic stainless steel, CF8C-Plus (CF8C-P), has been developed for a wide range of high temperature applications, including diesel exhaust components, turbine casings and turbocharger housings. CF8C-P offers significant improvements in creep rupture life and creep rupture strength over standard CF8C steel. However, at higher temperatures and in aggressive environments such as those containing significant water vapor, an oxidation-resistant protective coating will be necessary to extend service life. The oxidation behavior of alloys CF8C and CF8C-P with various aluminide coatings were compared at 800 C in air plus 10 vol% water vapor. Due to their affordability, slurry aluminides were the primary coating system of interest, although chemical vapor deposition and pack cementation coatings were also compared. Additionally, a preliminary study of the low-cycle fatigue (LCF) behavior of aluminized CF8C-P was conducted at 800 C. Each type of coating provided substantial improvements in oxidation behavior, with simple slurry aluminides exhibiting very good oxidation resistance after 3,000 h testing in water vapor. Preliminary LCF results indicated that thicker aluminide coatings degraded high temperature fatigue properties of CF8C-P, whereas thinner coatings did not. Results suggest that appropriately designed slurry aluminide coatings are a viable option for economical, long-term oxidation protection of austenitic stainless steels in water vapor.

Original language	English
Pages (from-to)	363-387
Number of pages	25
Journal	Oxidation of Metals
Volume	80
Issue number	3-4
DOIs	https://doi.org/10.1007/s11085-013-9378-y
State	Published - Oct 2013

Funding

Acknowledgments The authors would like to thank L. Walker, J. Henry, K. Cooley, and M. Howell for their role in the experimental work. S. Pawel provided helpful comments on the manuscript. This work reported in this manuscript has been performed by UT-Battelle, LLC, under contract with the U.S. Department of Energy. The research was sponsored by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Industrial Technology Program.

Keywords

Aluminide
Oxidation
Slurry coating
Stainless steel
Water vapor

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title = "Oxidation of slurry aluminide coatings on cast stainless steel alloy CF8C-plus at 800 C in water vapor",

abstract = "A new, cast austenitic stainless steel, CF8C-Plus (CF8C-P), has been developed for a wide range of high temperature applications, including diesel exhaust components, turbine casings and turbocharger housings. CF8C-P offers significant improvements in creep rupture life and creep rupture strength over standard CF8C steel. However, at higher temperatures and in aggressive environments such as those containing significant water vapor, an oxidation-resistant protective coating will be necessary to extend service life. The oxidation behavior of alloys CF8C and CF8C-P with various aluminide coatings were compared at 800 C in air plus 10 vol% water vapor. Due to their affordability, slurry aluminides were the primary coating system of interest, although chemical vapor deposition and pack cementation coatings were also compared. Additionally, a preliminary study of the low-cycle fatigue (LCF) behavior of aluminized CF8C-P was conducted at 800 C. Each type of coating provided substantial improvements in oxidation behavior, with simple slurry aluminides exhibiting very good oxidation resistance after 3,000 h testing in water vapor. Preliminary LCF results indicated that thicker aluminide coatings degraded high temperature fatigue properties of CF8C-P, whereas thinner coatings did not. Results suggest that appropriately designed slurry aluminide coatings are a viable option for economical, long-term oxidation protection of austenitic stainless steels in water vapor.",

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AU - Haynes, J. A.

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AU - Dryepondt, S.

AU - Zhang, Y.

PY - 2013/10

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AB - A new, cast austenitic stainless steel, CF8C-Plus (CF8C-P), has been developed for a wide range of high temperature applications, including diesel exhaust components, turbine casings and turbocharger housings. CF8C-P offers significant improvements in creep rupture life and creep rupture strength over standard CF8C steel. However, at higher temperatures and in aggressive environments such as those containing significant water vapor, an oxidation-resistant protective coating will be necessary to extend service life. The oxidation behavior of alloys CF8C and CF8C-P with various aluminide coatings were compared at 800 C in air plus 10 vol% water vapor. Due to their affordability, slurry aluminides were the primary coating system of interest, although chemical vapor deposition and pack cementation coatings were also compared. Additionally, a preliminary study of the low-cycle fatigue (LCF) behavior of aluminized CF8C-P was conducted at 800 C. Each type of coating provided substantial improvements in oxidation behavior, with simple slurry aluminides exhibiting very good oxidation resistance after 3,000 h testing in water vapor. Preliminary LCF results indicated that thicker aluminide coatings degraded high temperature fatigue properties of CF8C-P, whereas thinner coatings did not. Results suggest that appropriately designed slurry aluminide coatings are a viable option for economical, long-term oxidation protection of austenitic stainless steels in water vapor.

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Oxidation of slurry aluminide coatings on cast stainless steel alloy CF8C-plus at 800 C in water vapor

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