Journal
SURFACE & COATINGS TECHNOLOGY
Volume 240, Issue -, Pages 32-39Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.12.008
Keywords
Aluminide coatings; Pack cementation; Creep; Ferritic-martensitic steel; Hardness
Funding
- Department of Energy (DOE) Advanced Coal Research at U.S. Colleges and Universities [DE-FG26-06NT42674]
- DOE Fossil Energy Advanced Materials Research Program [DE-AC05-00OR22725]
- UT-Battelle LLC
- Tennessee Technological University [4000071336]
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The creep behavior of various pack cementation aluminide coatings on Grade 91 ferritic-martensitic steel was investigated at 650 degrees C in laboratory air. The coatings were fabricated in two temperature regimes, i.e., 650 or 700 degrees C (low temperature) and 1050 degrees C (high temperature), and consisted of a range of Al levels and thicknesses. For comparison, uncoated specimens heat-treated at 1050 degrees C to simulate the high temperature coating cycle also were included in the creep test. All coated specimens showed a reduction in creep resistance, with 16-51% decrease in rupture life compared to the as-received bare substrate alloy. However, the specimens heat-treated at 1050 degrees C exhibited the lowest creep resistance among all tested samples, with a surprisingly short rupture time of <25 h, much shorter than the specimen coated at 1050 degrees C. Factors responsible for the reduction in creep resistance of both coated and heat-treated specimens were discussed. (C) 2013 Elsevier B.V. All rights reserved.
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