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Title: MC Carbide Characterization in High Refractory Content Powder-Processed Ni-Based Superalloys

Abstract

Carbide precipitates in Ni-based superalloys are considered to be desirable phases that can contribute to improving high-temperature properties as well as aid in microstructural refinement of the material; however, they can also serve as crack initiation sites during fatigue. To date, most of the knowledge pertaining to carbide formation has originated from assessments of cast and wrought Ni-based superalloys. As powder-processed Ni-based superalloys are becoming increasingly widespread, understanding the different mechanisms by which they form becomes increasingly important. Detailed characterization of MC carbides present in two experimental high Nb-content powder-processed Ni-based superalloys revealed that Hf additions affect the resultant carbide morphologies. This morphology difference was attributed to a higher magnitude of elastic strain energy along the interface associated with Hf being soluble in the MC carbide lattice. The composition of the MC carbides was studied through atom probe tomography and consisted of a complex carbonitride core, which was rich in Nb and with slight Hf segregation, surrounded by an Nb carbide shell. The characterization results of the segregation behavior of Hf in the MC carbides and the subsequent influence on their morphology were compared to density functional theory calculations and found to be in good agreement, suggesting that computational modelingmore » can successfully be used to tailor carbide features.« less

Authors:
ORCiD logo [1];  [2];  [3];  [3];  [4];  [4];  [5];  [2]
  1. Univ. of Science and Technology, Beijing (China). State Key Lab for Advanced Metals and Materials; Illinois Inst. of Technology, Chicago, IL (United States)
  2. Illinois Inst. of Technology, Chicago, IL (United States)
  3. Univ. of Science and Technology, Beijing (China). State Key Lab for Advanced Metals and Materials
  4. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering; Northwestern Univ., Evanston, IL (United States). Center for Atom Probe Tomography
  5. Rolls Royce Corporation, Indianapolis, IN (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1543496
DOE Contract Number:  
AC02-05CH11231; AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 49; Journal Issue: 6; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
Materials Science; Metallurgy & Metallurgical Engineering

Citation Formats

Antonov, Stoichko, Chen, Wei, Huo, Jiajie, Feng, Qiang, Isheim, Dieter, Seidman, David N., Sun, Eugene, and Tin, Sammy. MC Carbide Characterization in High Refractory Content Powder-Processed Ni-Based Superalloys. United States: N. p., 2018. Web. doi:10.1007/s11661-018-4587-2.
Antonov, Stoichko, Chen, Wei, Huo, Jiajie, Feng, Qiang, Isheim, Dieter, Seidman, David N., Sun, Eugene, & Tin, Sammy. MC Carbide Characterization in High Refractory Content Powder-Processed Ni-Based Superalloys. United States. doi:10.1007/s11661-018-4587-2.
Antonov, Stoichko, Chen, Wei, Huo, Jiajie, Feng, Qiang, Isheim, Dieter, Seidman, David N., Sun, Eugene, and Tin, Sammy. Wed . "MC Carbide Characterization in High Refractory Content Powder-Processed Ni-Based Superalloys". United States. doi:10.1007/s11661-018-4587-2.
@article{osti_1543496,
title = {MC Carbide Characterization in High Refractory Content Powder-Processed Ni-Based Superalloys},
author = {Antonov, Stoichko and Chen, Wei and Huo, Jiajie and Feng, Qiang and Isheim, Dieter and Seidman, David N. and Sun, Eugene and Tin, Sammy},
abstractNote = {Carbide precipitates in Ni-based superalloys are considered to be desirable phases that can contribute to improving high-temperature properties as well as aid in microstructural refinement of the material; however, they can also serve as crack initiation sites during fatigue. To date, most of the knowledge pertaining to carbide formation has originated from assessments of cast and wrought Ni-based superalloys. As powder-processed Ni-based superalloys are becoming increasingly widespread, understanding the different mechanisms by which they form becomes increasingly important. Detailed characterization of MC carbides present in two experimental high Nb-content powder-processed Ni-based superalloys revealed that Hf additions affect the resultant carbide morphologies. This morphology difference was attributed to a higher magnitude of elastic strain energy along the interface associated with Hf being soluble in the MC carbide lattice. The composition of the MC carbides was studied through atom probe tomography and consisted of a complex carbonitride core, which was rich in Nb and with slight Hf segregation, surrounded by an Nb carbide shell. The characterization results of the segregation behavior of Hf in the MC carbides and the subsequent influence on their morphology were compared to density functional theory calculations and found to be in good agreement, suggesting that computational modeling can successfully be used to tailor carbide features.},
doi = {10.1007/s11661-018-4587-2},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
issn = {1073-5623},
number = 6,
volume = 49,
place = {United States},
year = {2018},
month = {4}
}

Works referenced in this record:

Projector augmented-wave method
journal, December 1994


From ultrasoft pseudopotentials to the projector augmented-wave method
journal, January 1999


Generalized Gradient Approximation Made Simple
journal, October 1996

  • Perdew, John P.; Burke, Kieron; Ernzerhof, Matthias
  • Physical Review Letters, Vol. 77, Issue 18, p. 3865-3868
  • DOI: 10.1103/PhysRevLett.77.3865