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Title: Interdiffusion Behavior of Aluminide Coatings on Fe-Base Alloys

Abstract

One of the potential degradation modes of oxidation-resistant iron aluminide coatings is the loss of Al from the coatings into Fe-base substrate alloys that typically contain no Al. To address this issue, interdiffusion between aluminide coatings and steel substrates was studied for times up to 10,000 h in the temperature range of 500-800 C. Coatings were synthesized in a laboratory chemical vapor deposition (CVD) reactor on representative commercial ferritic alloy Fe-9Cr-1Mo and type 304L austenitic stainless steel. The microstructural and compositional changes after diffusion anneals were examined in detail. An initial attempt to model the interdiffusion behavior was carried out by applying an existing software program COSIM (coating oxidation and substrate interdiffusion model). Complementary work was conducted using a simple mathematic model developed by Heckel et al. Reasonable agreement was observed between the simulated and experimental composition profiles for the aluminide coatings on ferritic alloys. Model results were then applied to predict coating lifetime.

Authors:
 [1];  [1];  [2]
  1. Tennessee Technological University
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); High Temperature Materials Laboratory; Shared Research Equipment Collaborative Research Center
Sponsoring Org.:
FE USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
931922
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials and Corrosion; Journal Volume: 58; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; IRON BASE ALLOYS; CHEMICAL VAPOR DEPOSITION; COATINGS; DIFFUSION; IRON; LIFETIME; OXIDATION; STAINLESS STEELS; STEELS; SUBSTRATES; ALUMINIUM; Coatings; Aluminide; Oxidation; Interdiffusion; Model

Citation Formats

Zhang, Ying, Liu, A. P., and Pint, Bruce A. Interdiffusion Behavior of Aluminide Coatings on Fe-Base Alloys. United States: N. p., 2007. Web. doi:10.1002/maco.200704057.
Zhang, Ying, Liu, A. P., & Pint, Bruce A. Interdiffusion Behavior of Aluminide Coatings on Fe-Base Alloys. United States. doi:10.1002/maco.200704057.
Zhang, Ying, Liu, A. P., and Pint, Bruce A. Mon . "Interdiffusion Behavior of Aluminide Coatings on Fe-Base Alloys". United States. doi:10.1002/maco.200704057.
@article{osti_931922,
title = {Interdiffusion Behavior of Aluminide Coatings on Fe-Base Alloys},
author = {Zhang, Ying and Liu, A. P. and Pint, Bruce A},
abstractNote = {One of the potential degradation modes of oxidation-resistant iron aluminide coatings is the loss of Al from the coatings into Fe-base substrate alloys that typically contain no Al. To address this issue, interdiffusion between aluminide coatings and steel substrates was studied for times up to 10,000 h in the temperature range of 500-800 C. Coatings were synthesized in a laboratory chemical vapor deposition (CVD) reactor on representative commercial ferritic alloy Fe-9Cr-1Mo and type 304L austenitic stainless steel. The microstructural and compositional changes after diffusion anneals were examined in detail. An initial attempt to model the interdiffusion behavior was carried out by applying an existing software program COSIM (coating oxidation and substrate interdiffusion model). Complementary work was conducted using a simple mathematic model developed by Heckel et al. Reasonable agreement was observed between the simulated and experimental composition profiles for the aluminide coatings on ferritic alloys. Model results were then applied to predict coating lifetime.},
doi = {10.1002/maco.200704057},
journal = {Materials and Corrosion},
number = 10,
volume = 58,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}