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Article
Stability of Binary and Ternary M23C6 Carbides from First Principles
Computational Materials Science
  • N. I. Medvedeva
  • David C. Van Aken, Missouri University of Science and Technology
  • Julia E. Medvedeva, Missouri University of Science and Technology
Abstract
First-principles calculations were performed to study the phase stability of M23C6, (M = V, Cr, Mn, Fe, Co, Ni) and the solubility of d-impurities (Fe, Co, Ni, W) in Cr23C6, which is the most prevalent carbide in chromium steels. Our results correctly predict the relative stability of binary carbides, among which the most stable compounds are V23C6, Cr23C6 and Mn23C6. Stability of the M23C6 and MC carbides was related to the Md-filling, where the M-M and M-C bonds provide the cohesive properties, respectively. We demonstrated that iron and nickel should always be present in Cr23C6, where their concentrations may reach 50 at.% and 30 at.%, respectively. To predict the ways to control the carbide stabilization and distribution in iron matrix, both of which govern the microstructure and mechanical properties of high-alloy steels, we also investigated the effect of tungsten addition on the stability of quaternary carbides, namely (Cr, W, M)23C6 (M = Fe, Co, Ni). We found that tungsten strongly enhances the solubility of iron and nickel in chromium carbide, but it does not affect the cobalt solubility. A similar stabilizing effect was predicted for molybdenum, and it can be suggested that both tungsten and molybdenum should accelerate the formation of M23C6 and influence the kinetics of carbide precipitation.
Department(s)
Materials Science and Engineering
Second Department
Physics
Research Center/Lab(s)
Center for High Performance Computing Research
Keywords and Phrases
  • Alloy Steel,
  • Calculations,
  • Chromium,
  • Convergence of Numerical Methods,
  • Iron,
  • Iron Alloys,
  • Iron Compounds,
  • Manganese,
  • Mechanical Properties,
  • Molybdenum,
  • Nickel,
  • Phase Stability,
  • Solubility,
  • Stabilization,
  • Tungsten,
  • Ab Initio Calculations,
  • Carbide Precipitation,
  • Electronic and Magnetic Properties,
  • First-Principles Calculation,
  • M23C6,
  • Microstructure and Mechanical Properties,
  • Relative Stabilities,
  • Transition Metal Carbide,
  • Tungsten Carbide
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2015 Elsevier, All rights reserved.
Publication Date
1-1-2015
Citation Information
N. I. Medvedeva, David C. Van Aken and Julia E. Medvedeva. "Stability of Binary and Ternary M23C6 Carbides from First Principles" Computational Materials Science Vol. 96, Part A Iss. PA (2015) p. 159 - 164 ISSN: 9270256
Available at: http://works.bepress.com/julia-medvedeva/41/