Role of Cr-rich carbide precipitates in the intergranular oxidation of Ni-Cr alloys

Sushko, Maria L.; Schreiber, Daniel K.; Rosso, Kevin M.; Bruemmer, Stephen M.

doi:10.1016/j.scriptamat.2018.07.016

Role of Cr-rich carbide precipitates in the intergranular oxidation of Ni-Cr alloys

Journal Article · Fri Jul 20 00:00:00 EDT 2018 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2018.07.016· OSTI ID:1842953

^[1]; Schreiber, Daniel K. ^[1]; ^[1]; Bruemmer, Stephen M. ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

The influence of grain boundary Cr carbides on the intergranular oxidation behavior of a Ni-16Cr alloy is considered using atomistic-to-mesoscale model and atom probe tomography. Cr carbide strongly perturbs the collective reactive dynamics of oxidizing species and alloy elements in the intergranular region. Strong attractive interactions between oxygen and carbide create a driving force for Cr and Ni accumulation in the grain boundary adjacent to the carbide, and for the depletion of Cr and Ni ahead of the oxidation front beyond the carbide. Furthermore, the results shed light on the mechanism of carbide-assisted protection of the alloy against grain boundary corrosion/oxidation.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1842953

Alternate ID(s):: OSTI ID: 1548069
OSTI ID: 22819293

Report Number(s):: PNNL-SA--136248

Journal Information:: Scripta Materialia, Journal Name: Scripta Materialia Vol. 156; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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High-Temperature Friction and Wear Properties of NiCr/hBN Self-Lubricating Composites Zhu, Xuewei; Wei, Xiaofeng; Huang, Yuxiang Metals, Vol. 9, Issue 3 https://doi.org/10.3390/met9030356	journal	March 2019

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36 MATERIALS SCIENCE
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