Abstract
Pack and chemical vapor deposited (CVD) aluminide coatings on commercial ferritic-martensitic Fe-9Cr-2W steel are being investigated by creep and corrosion testing at 650 °C. Results from different coating thicknesses show that the coated region makes no contribution to the creep strength. The creep behavior of uncoated material was studied after various heat treatments to simulate the coating process and typical secondary heat treatments. Alternating creep and corrosion exposures showed little effect on the creep strength of uncoated material but coated materials became progressively weaker. The coatings were protective in wet air at 650 °C after creep testing.
| Original language | English |
|---|---|
| Pages (from-to) | 3880-3884 |
| Number of pages | 5 |
| Journal | Surface and Coatings Technology |
| Volume | 201 |
| Issue number | 7 SPEC. ISS. |
| DOIs | |
| State | Published - Dec 20 2006 |
Funding
The authors would like to thank K. Cooley at ORNL and W. Q. Wang at TTU for assistance with the experimental work, R. L. Klueh and E. Lara-Curzio for their useful comments and P. F. Tortorelli and I. G. Wright for reviewing the manuscript. This research was sponsored by the U.S. Department of Energy, Fossil Energy Advanced Materials Research Program, under contract DE-AC05-00OR22725 with UT-Battelle, LLC.
Keywords
- B oxidation in water vapor
- Creep
- Iron
- Iron oxide
- Pack diffusion coatings
- Reliability models