Creep behavior of pack cementation aluminide coatings on Grade 91 ferritic martensitic alloy

Journal Article · Tue Dec 31 23:00:00 EST 2013 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/j.surfcoat.2013.12.008· OSTI ID:1158758

Bates, Brian ^[1]; Zhang, Ying ^[1]; Dryepondt, Sebastien N ^[2]; Pint, Bruce A ^[2]

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1. Tennessee Technological University
2. ORNL

The creep behavior of various pack cementation aluminide coatings on Grade 91 ferritic-martensitic steel was investigated at 650 C in laboratory air. The coatings were fabricated in two temperature regimes, i.e., 650 or 700 C (low temperature) and 1050 C(high temperature), and consisted of a range of Al levels and thicknesses. For comparison, uncoated specimens heat-treated at 1050 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 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 C. Factors responsible for the reduction in creep resistance of both coated and heat-treated specimens were discussed.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1158758
• Journal Information: Surface and Coatings Technology, Journal Name: Surface and Coatings Technology Vol. 240; ISSN 0257-8972
• Country of Publication: United States
• Language: English