Journal
SCRIPTA MATERIALIA
Volume 154, Issue -, Pages 149-153Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.05.038
Keywords
Carbides; First-principles calculations; Mechanical properties; Thermodynamics; EPMA
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Funding
- National Natural Science Foundation of China [51571103, 51561018, 51501079]
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The heat resistance of the eta carbides is important for red hardness and hot strength of high tungsten iron-base alloys. The crystal structure and exact composition of eta carbides in this work are revealed to be cubic, Fe3.01W2.33Cr0.38V0.28C1.06 by extraction, X-ray diffraction refinement and electron probe micro-analysis. Defect formation energy calculations show that Cr and V occupy W sites in the lattice. Cr and V decrease the mechanical properties and weaken the elastic heat resistance of eta carbides, which is attributed to the C-Cr and C-V bonds weaker than C-W bonds and the C-Cr bonds population decrease at high temperature. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
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