Author
John H. Devan
Bio: John H. Devan is an academic researcher from Oak Ridge National Laboratory. The author has contributed to research in topics: Combustion & Corrosion. The author has an hindex of 1, co-authored 1 publications receiving 260 citations.
Topics: Combustion, Corrosion, Oxide, Alloy, Corrosion fatigue
Papers
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TL;DR: The role of grain boundaries in corrosion product scales as short-circuit transport paths for the outward diffusion of metal and the inward ingress of oxygen, sulfur and carbon needs to be clarified.
263 citations
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01 Mar 2006
TL;DR: In this article, the authors present a solution to Fick's second law for a semi-infinite solid and a rigorous derivation of the kinetics of internal oxidation, as well as the effects of impurities on oxide defect structure.
Abstract: Acknowledgments Preface Introduction 1. Methods of investigation 2. Thermodynamic fundamentals 3. Mechanisms of oxidation 4. Oxidation of pure metals 5. Oxidation of alloys 6. Oxidation by oxidants other than oxygen 7. Reactions of metals in mixed environments 8. Hot corrosion 9. Erosion-corrosion of metals in oxidizing atmospheres 10. Protective coatings 11. Atmosphere control for the protection of metals during production processes Appendix A. Solution to Fick's second law for a semi-infinite solid Appendix B. Rigorous derivation of the kinetics of internal oxidation Appendix C. Effects of impurities on oxide defect structure Index.
2,200 citations
TL;DR: In this paper, the potential corrosion problems associated with burning biomass fuels either alone or in blends with coal, for electricity production are discussed, and the most severe corrosion problems in biomass-fired systems are expected to occur due to Cl-rich deposits formed on superheater tubes.
669 citations
TL;DR: In this article, a fracture analysis of indentation-induced delamination of thin films is presented based on a model system in which the section of film above the delaminating crack is treated as a rigidly clamped disc, and the crack extension force is derived from changes in strain energy of the system as the crack extends.
Abstract: A fracture analysis of indentation‐induced delamination of thin films is presented. The analysis is based on a model system in which the section of film above the delaminating crack is treated as a rigidly clamped disc, and the crack extension force is derived from changes in strain energy of the system as the crack extends. Residual deposition stresses influence the cracking response by inducing buckling of the film above the crack and by providing an additional crack driving force once buckling occurs. A relation for the equilibrium crack length is derived in terms of the indenter load and geometry, the film thickness and mechanical properties, the residual stress level, and the fracture toughness of the interface. The analysis provides a basis for using controlled indentation cracking as a quantitative measure of interface toughness and for evaluating contact‐induced damage in thin films.
438 citations
TL;DR: In this article, a friction stir welding (FSW) metalworking model is proposed which partitions flow through distinct deformation zone geometries around the pin probe and beneath the shoulder, under the effects of the temperature field, constitutive properties, strain rate and pin tool geometry in these zones.
264 citations
TL;DR: In this article, an analysis of material flow during friction stir welding is performed using two different pin profiles: a cylindrical tapered pin with flats and an unthreaded pin with flat faces.
181 citations