51316-7514-The Influence of Microstructure on the Aqueous Corrosion of Fe-26Al-X

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Product Number: 51316-7514-SG

ISBN: 7514 2016 CP

Author: Tatiana Kutz

Publication Date: 2016

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Iron aluminides pose high potential for substitution of current materials implemented in high-temperature applications due to such preferred properties as high strength-to-weight ratios and superior oxidation resistance. Additionally the lucrativeness and ease of fabrication provide a further initiative to instigate a switch from current cost intensive stainless steels and nickel-based alloys to this intermetallic material. The full commercialization of these materials has been hindered due to a limited ductility at room temperature and a certain reduction in strength when exposed long-term to temperatures exceeding 550°C.In response to these restraints and demands focus on the combined influence of aluminum content and ternary elements and the resulting microstructure on mechanical properties has been instituted. The complementary data regarding these microstructural influences and their impact on corrosion resistance has yet to be fully realized. Additionally the ever expanding interest in changes in operational surroundings and their influence on corrosion has incited experimental conditions to include aqueous environments. Such cyclic changes can be observed in the increasing dispatchability of European power plants due to a change in energy provisions.In order to facilitate a comprehensive correlation between microstructure and corrosion 4 at.% of various ternary elements such as Cr and Ti were alloyed to a binary Fe-26 at.% Al system. Additionally as chloride ions have been identified as corrosion instigating components to this system their addition to the sulfuric acid testing solution was investigated. Due to the changes prompted by the alloy variations microstructural aspects such as grain size variation phase analysis precipitation determination etc. were evaluated prior to corrosion testing. The resulting corrosion variations including such qualities as oxide layer composition and corrosion mechanism/type was correlated to the previously determined microstructural features and the composition of the utilized testing solution.