Journal
CORROSION SCIENCE
Volume 179, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109144
Keywords
Nickel alloys; Laser deposition; Interdendritic oxidation; Segregation; Carbides
Funding
- National Key R&D Program of China [2020YFB2007600]
- National Natural Science Foundation of China [51875190]
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body at Hunan University, China [71775005]
- Graduate Scientific Research Innovation Project of Hunan Province [CX20190279]
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Preferential interdendritic oxidation observed in as-built additively manufactured Inconel 718 significantly promotes oxidation kinetics, highlighting the importance of homogenizing the composition and controlling primary precipitates to improve oxidation performance.
Preferential interdendritic oxidation of as-built additively manufactured Inconel 718 is observed. Interdendritic depletion of Cr and enrichment of Ti are responsible for a slow formation of fine-grain Cr2O3 external scale that aids the establishment of a high-level oxygen partial pressure along the interdendrtic region. Incomplete oxidation of carbides results in a large volume expansion. Oxidation of Laves phases leads to a discontinuous NbO interlayer that facilitates countercurrent diffusion channels. Preferential interdendritic oxidation dramatically promotes oxidation kinetics of both transientand diffusion-controlled stages. Measures to homogenize the composition and to control the primary precipitates are desired to improve the oxidation performance.
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