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Spallation process of thermally grown oxides by in-situ CCD monitoring technique

  • Yu-hong Qi
  • Philippe Lours
  • Yannick Le Maoult
Article

Abstract

In cooling process of Fe-Cr-Al alloy oxidized at 1300 °C, the effect of cooling speed and exposure time on oxide spalled area fraction and successive variety of the spalled region were studied by investigating evolvement of the thermally grown oxide using in-situ CCD monitoring technique. The results showed that oxide spallation can be restrained by controlling cooling speed and the critical temperature drop of spallation initiation which is closely related to the oxide thickness or exposure time, and the spallation process of a little region may be described in more detail as two routes: from the oxide/substrate interface micro-decohesion, micro-buckles, buckle spreading, buckle crack to spallation and from the interface micro-decohesion. micro-buckles, buckle crack and spallation to the residual oxide decohesion and spallation.

Key words

in-situ CCD monitoring technique spallation thermally grown oxides Fe-Cr-Al 

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References

  1. [1]
    Evans H E. Stress Effects in High Temperature Oxidation of Metals [J]. International Materials Reviews, 1995, 40(1): 1.CrossRefGoogle Scholar
  2. [2]
    McCartney L N. Modelling Scale Failure in Tension (Fracture and Spallation) [J]. Materials at High Temperatures, 2005, 22(1–2): 167.CrossRefGoogle Scholar
  3. [3]
    Bamba G, Wouters Y, Galerie A, et al. Thermal Oxidation Kinetics and Oxide Scale Adhesion of Fe-15Cr Alloys as a Function of Their Silicon Content [J]. Acta Materialia, 2006, 54(15): 3917.CrossRefGoogle Scholar
  4. [4]
    Evans H E. Spallation Models and Their Relevance to Steam-Grown Oxides [J]. Materials at High Temperatures, 2005, 22 (1–2): 155.CrossRefGoogle Scholar
  5. [5]
    Hou P Y, Saunders S R J. A Survey of Test Methods for Scale Adhesion Measurement [J]. Materials at High Temperatures, 2005, 22(1–2): 121.CrossRefGoogle Scholar
  6. [6]
    Evans H E. Spallation of Oxide From Stainless Steel Agr Nuclear Fuel Cladding: Mechanisms and Consequences [J]. Mater Sci Technol, 1987, 4: 415.Google Scholar
  7. [7]
    Nishiyama Y, Kitamura K, Kudo T, et al. In Situ Evaluations for Spallation of Cr2O3 Scale by AE and Raman Spectroscopy [J]. Journal of the Japan Institute of Metals, 2007, 71(1): 55 (in Japanese).CrossRefGoogle Scholar
  8. [8]
    Lours P, Maoult Y, Ade D, et al. Direct Examinations of Oxide Scales Upon Cooling: A New Way to Analyse Oxide Scale Spallation [J]. Materials Science Forum, 2004, 461–464(II): 639.Google Scholar
  9. [9]
    Lours P, Qi Y, Le Maoult Y, et al. In Situ and ex Situ Investigation of the Spallation of Thermally Grown Oxides [J]. Materials Science Forum, 2007, 539–543(2): 1134.CrossRefGoogle Scholar

Copyright information

© China Iron and Steel Research Institute Group 2009

Authors and Affiliations

  1. 1.Materials Science and Engineering DepartmentDalian Maritime UniversityDalian, LiaoningChina
  2. 2.Research Centre on ToolsMaterials and Processes, Ecole des MinesAlbiFrance

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