Stability of MX-type strengthening nanoprecipitates in ferritic steels under thermal aging, stress and ion irradiation

L. Tan; T. S. Byun; Y. Katoh; L. L. Snead

doi:10.1016/j.actamat.2014.03.015

Stability of MX-type strengthening nanoprecipitates in ferritic steels under thermal aging, stress and ion irradiation

L. Tan, T. S. Byun, Y. Katoh, L. L. Snead

Research output: Contribution to journal › Article › peer-review

91 Scopus citations

Abstract

The stability of MX-type precipitates is critical to retain mechanical properties of both reduced activation ferritic-martensitic (RAFM) and conventional FM steels at elevated temperatures above ∼500 °C. The stability of TaC, TaN and VN nanoprecipitates under thermal aging (600 and 700°C), creep (600°C) and ion irradiation (Fe ion, 500°C) conditions was systematically studied in this work. The statistical particle evolution in density and size was characterized using transmission electron microscopy. Nanoprecipitate stability under the studied conditions manifested differently through either dissolution, reprecipitation, growth or fragmentation, with TaC exhibiting the greatest stability followed by VN and TaN in sequence. Nanoprecipitate evolution phenomena and mechanisms and the apparent disagreement of this interpretation with published literature on the subject are discussed. These findings not only help understanding the degradation mechanisms of RAFM and conventional FM steels at elevated temperatures and under stress and irradiation, but should also prove beneficial to the development of advanced RAFM steels.

Original language	English
Pages (from-to)	11-19
Number of pages	9
Journal	Acta Materialia
Volume	71
DOIs	https://doi.org/10.1016/j.actamat.2014.03.015
State	Published - Jun 2014

Funding

Research was sponsored by the US Department of Energy (DOE), Office of Fusion Energy Sciences under contract DE-AC05-00OR22725 with UT-Battelle, LLC, and through a user project supported by ORNL’s Center for Nanophase Materials Sciences (CNMS) that is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US DOE . Work was also supported by the US DOE, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517, as part of an ATR National Scientific User Facility experiment. Dr. G.S. Was is appreciated for his advice on the Fe 2+ ion irradiation experiment, Drs. F.W. Wiffen and K.G. Field for reviewing the paper and Mr. O. Toader and Mrs. D.W. Coffey for conducting the Fe 2+ ion irradiation experiment and preparing the FIB specimens, respectively.

Keywords

Dissolution
Growth
Irradiation effect
Precipitation
Strength

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10.1016/j.actamat.2014.03.015

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title = "Stability of MX-type strengthening nanoprecipitates in ferritic steels under thermal aging, stress and ion irradiation",

abstract = "The stability of MX-type precipitates is critical to retain mechanical properties of both reduced activation ferritic-martensitic (RAFM) and conventional FM steels at elevated temperatures above ∼500 °C. The stability of TaC, TaN and VN nanoprecipitates under thermal aging (600 and 700°C), creep (600°C) and ion irradiation (Fe ion, 500°C) conditions was systematically studied in this work. The statistical particle evolution in density and size was characterized using transmission electron microscopy. Nanoprecipitate stability under the studied conditions manifested differently through either dissolution, reprecipitation, growth or fragmentation, with TaC exhibiting the greatest stability followed by VN and TaN in sequence. Nanoprecipitate evolution phenomena and mechanisms and the apparent disagreement of this interpretation with published literature on the subject are discussed. These findings not only help understanding the degradation mechanisms of RAFM and conventional FM steels at elevated temperatures and under stress and irradiation, but should also prove beneficial to the development of advanced RAFM steels.",

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AU - Tan, L.

AU - Byun, T. S.

AU - Katoh, Y.

AU - Snead, L. L.

PY - 2014/6

Y1 - 2014/6

N2 - The stability of MX-type precipitates is critical to retain mechanical properties of both reduced activation ferritic-martensitic (RAFM) and conventional FM steels at elevated temperatures above ∼500 °C. The stability of TaC, TaN and VN nanoprecipitates under thermal aging (600 and 700°C), creep (600°C) and ion irradiation (Fe ion, 500°C) conditions was systematically studied in this work. The statistical particle evolution in density and size was characterized using transmission electron microscopy. Nanoprecipitate stability under the studied conditions manifested differently through either dissolution, reprecipitation, growth or fragmentation, with TaC exhibiting the greatest stability followed by VN and TaN in sequence. Nanoprecipitate evolution phenomena and mechanisms and the apparent disagreement of this interpretation with published literature on the subject are discussed. These findings not only help understanding the degradation mechanisms of RAFM and conventional FM steels at elevated temperatures and under stress and irradiation, but should also prove beneficial to the development of advanced RAFM steels.

AB - The stability of MX-type precipitates is critical to retain mechanical properties of both reduced activation ferritic-martensitic (RAFM) and conventional FM steels at elevated temperatures above ∼500 °C. The stability of TaC, TaN and VN nanoprecipitates under thermal aging (600 and 700°C), creep (600°C) and ion irradiation (Fe ion, 500°C) conditions was systematically studied in this work. The statistical particle evolution in density and size was characterized using transmission electron microscopy. Nanoprecipitate stability under the studied conditions manifested differently through either dissolution, reprecipitation, growth or fragmentation, with TaC exhibiting the greatest stability followed by VN and TaN in sequence. Nanoprecipitate evolution phenomena and mechanisms and the apparent disagreement of this interpretation with published literature on the subject are discussed. These findings not only help understanding the degradation mechanisms of RAFM and conventional FM steels at elevated temperatures and under stress and irradiation, but should also prove beneficial to the development of advanced RAFM steels.

KW - Dissolution

KW - Growth

KW - Irradiation effect

KW - Precipitation

KW - Strength

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ER -

Stability of MX-type strengthening nanoprecipitates in ferritic steels under thermal aging, stress and ion irradiation

Abstract

Funding

Keywords

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