Thermal stability of intermetallic phases in Fe-rich Fe-Cr-Ni-Mo alloys

Yang, Ying; Tan, Lizhen; Busby, Jeremy T.

doi:10.1007/s11661-015-2997-y

Title: Thermal stability of intermetallic phases in Fe-rich Fe-Cr-Ni-Mo alloys

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Abstract

Understanding the stability of precipitate phases in the Fe-rich Fe-Cr-Ni-Mo alloys is critical to the alloy design and application of Mo-containing Austenitic steels. Coupled with thermodynamic modeling, stability of the chi and Laves phases in two Fe-Cr-Ni-Mo alloys were investigated at 1000, 850 and 700 °C for different annealing time. The morphologies, compositions and crystal structures of the matrix and precipitate phases were carefully examined by Scanning Electron Microscopy, Electron Probe Microanalysis, X-ray diffraction and Transmission Electron Microscopy. The two key findings resulted from this work. One is that the chi phase is stable at high temperature and transformed into the Laves phase at low temperature. The other is that both the chi and Laves phases have large solubilites of Cr, Mo and Ni, among which the Mo solubility has a major role on the relative stability of the precipitate phases. The developed thermodynamic models were then applied to evaluating the Mo effect on the stability of precipitate phases in AISI 316 and NF709 alloys.

Authors:

Yang, Ying ^[1]; Tan, Lizhen ^[1]; Busby, Jeremy T. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Fri Jun 12 00:00:00 EDT 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1210133

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

Additional Journal Information:: Journal Volume: 46; Journal Issue: 9; Journal ID: ISSN 1073-5623

Publisher:: ASM International

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Yang, Ying, Tan, Lizhen, and Busby, Jeremy T. Thermal stability of intermetallic phases in Fe-rich Fe-Cr-Ni-Mo alloys.  United States: N. p., 2015. 
Web.  doi:10.1007/s11661-015-2997-y.

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                    Yang, Ying, Tan, Lizhen, & Busby, Jeremy T. Thermal stability of intermetallic phases in Fe-rich Fe-Cr-Ni-Mo alloys.  United States.  https://doi.org/10.1007/s11661-015-2997-y

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                    Yang, Ying, Tan, Lizhen, and Busby, Jeremy T. Fri .  
"Thermal stability of intermetallic phases in Fe-rich Fe-Cr-Ni-Mo alloys".  United States.  https://doi.org/10.1007/s11661-015-2997-y.  https://www.osti.gov/servlets/purl/1210133.

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@article{osti_1210133,

  title        = {Thermal stability of intermetallic phases in Fe-rich Fe-Cr-Ni-Mo alloys},

  author       = {Yang, Ying and Tan, Lizhen and Busby, Jeremy T.},

  abstractNote = {Understanding the stability of precipitate phases in the Fe-rich Fe-Cr-Ni-Mo alloys is critical to the alloy design and application of Mo-containing Austenitic steels. Coupled with thermodynamic modeling, stability of the chi and Laves phases in two Fe-Cr-Ni-Mo alloys were investigated at 1000, 850 and 700 °C for different annealing time. The morphologies, compositions and crystal structures of the matrix and precipitate phases were carefully examined by Scanning Electron Microscopy, Electron Probe Microanalysis, X-ray diffraction and Transmission Electron Microscopy. The two key findings resulted from this work. One is that the chi phase is stable at high temperature and transformed into the Laves phase at low temperature. The other is that both the chi and Laves phases have large solubilites of Cr, Mo and Ni, among which the Mo solubility has a major role on the relative stability of the precipitate phases. The developed thermodynamic models were then applied to evaluating the Mo effect on the stability of precipitate phases in AISI 316 and NF709 alloys.},

  doi          = {10.1007/s11661-015-2997-y},

  journal      = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},

  number       = 9,

  volume       = 46,

  place        = {United States},

  year         = {Fri Jun 12 00:00:00 EDT 2015},

  month        = {Fri Jun 12 00:00:00 EDT 2015}

}

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