Stability of the strengthening nanoprecipitates in reduced activation ferritic steels under Fe2+ ion irradiation

L. Tan; Y. Katoh; L. L. Snead

doi:10.1016/j.jnucmat.2013.11.003

Stability of the strengthening nanoprecipitates in reduced activation ferritic steels under Fe²⁺ ion irradiation

L. Tan, Y. Katoh, L. L. Snead

Materials Science and Technology Div

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

27 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. Radiation resistance of TaC, TaN, and VN nanoprecipitates irradiated up to ∼49 dpa at 500 C using Fe ²⁺ is investigated in this work. Transmission electron microscopy (TEM) utilized in standard and scanning mode (STEM) reveals the non-stoichiometric nature of the nanoprecipitates. Irradiation did not alter their crystalline nature. The radiation resistance of these precipitates, in an order of reduced resistance, is TaC, VN, and TaN. Particle dissolution, growth, and reprecipitation were the modes of irradiation-induced instability. Irradiation also facilitated formation of Fe₂W type Laves phase limited to the VN and TaN bearing alloys. This result suggests that nitrogen level should be controlled to a minimal level in alloys to gain greater radiation resistance of the MX-type precipitates at similar temperatures as well as postpone the formation and subsequent coarsening of Laves phase.

Original language	English
Pages (from-to)	104-110
Number of pages	7
Journal	Journal of Nuclear Materials
Volume	445
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2013.11.003
State	Published - 2014

Funding

Research supported by the U.S. 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, U.S. DOE. Work also supported by the U.S. 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. Mr. O. Toader and Mrs. D.W. Coffey are also appreciated for conducting the Fe 2+ ion irradiation experiment and preparing the FIB specimens, respectively.

Funders	Funder number
CNMS
ORNL’s Center for Nanophase Materials Sciences
Office of Basic Energy Sciences
Scientific User Facilities Division
U.S. DOE
U.S. Department of Energy
Office of Nuclear Energy	DE-AC07-051D14517
Fusion Energy Sciences	DE-AC05-00OR22725

Keywords

Displacement cascades
Dissolution
Nanoprecipitates
Radiation resistance
Reprecipitation

Access to Document

10.1016/j.jnucmat.2013.11.003

Cite this

@article{e7d698d5b3f242dc90b910c4f164f6f2,

title = "Stability of the strengthening nanoprecipitates in reduced activation ferritic steels under Fe2+ 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. Radiation resistance of TaC, TaN, and VN nanoprecipitates irradiated up to ∼49 dpa at 500 C using Fe 2+ is investigated in this work. Transmission electron microscopy (TEM) utilized in standard and scanning mode (STEM) reveals the non-stoichiometric nature of the nanoprecipitates. Irradiation did not alter their crystalline nature. The radiation resistance of these precipitates, in an order of reduced resistance, is TaC, VN, and TaN. Particle dissolution, growth, and reprecipitation were the modes of irradiation-induced instability. Irradiation also facilitated formation of Fe2W type Laves phase limited to the VN and TaN bearing alloys. This result suggests that nitrogen level should be controlled to a minimal level in alloys to gain greater radiation resistance of the MX-type precipitates at similar temperatures as well as postpone the formation and subsequent coarsening of Laves phase.",

keywords = "Displacement cascades, Dissolution, Nanoprecipitates, Radiation resistance, Reprecipitation",

author = "L. Tan and Y. Katoh and Snead, {L. L.}",

year = "2014",

doi = "10.1016/j.jnucmat.2013.11.003",

language = "English",

volume = "445",

pages = "104--110",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

T1 - Stability of the strengthening nanoprecipitates in reduced activation ferritic steels under Fe2+ ion irradiation

AU - Tan, L.

AU - Katoh, Y.

AU - Snead, L. L.

PY - 2014

Y1 - 2014

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. Radiation resistance of TaC, TaN, and VN nanoprecipitates irradiated up to ∼49 dpa at 500 C using Fe 2+ is investigated in this work. Transmission electron microscopy (TEM) utilized in standard and scanning mode (STEM) reveals the non-stoichiometric nature of the nanoprecipitates. Irradiation did not alter their crystalline nature. The radiation resistance of these precipitates, in an order of reduced resistance, is TaC, VN, and TaN. Particle dissolution, growth, and reprecipitation were the modes of irradiation-induced instability. Irradiation also facilitated formation of Fe2W type Laves phase limited to the VN and TaN bearing alloys. This result suggests that nitrogen level should be controlled to a minimal level in alloys to gain greater radiation resistance of the MX-type precipitates at similar temperatures as well as postpone the formation and subsequent coarsening of Laves phase.

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. Radiation resistance of TaC, TaN, and VN nanoprecipitates irradiated up to ∼49 dpa at 500 C using Fe 2+ is investigated in this work. Transmission electron microscopy (TEM) utilized in standard and scanning mode (STEM) reveals the non-stoichiometric nature of the nanoprecipitates. Irradiation did not alter their crystalline nature. The radiation resistance of these precipitates, in an order of reduced resistance, is TaC, VN, and TaN. Particle dissolution, growth, and reprecipitation were the modes of irradiation-induced instability. Irradiation also facilitated formation of Fe2W type Laves phase limited to the VN and TaN bearing alloys. This result suggests that nitrogen level should be controlled to a minimal level in alloys to gain greater radiation resistance of the MX-type precipitates at similar temperatures as well as postpone the formation and subsequent coarsening of Laves phase.

KW - Displacement cascades

KW - Dissolution

KW - Nanoprecipitates

KW - Radiation resistance

KW - Reprecipitation

UR - http://www.scopus.com/inward/record.url?scp=84888579700&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2013.11.003

DO - 10.1016/j.jnucmat.2013.11.003

M3 - Article

AN - SCOPUS:84888579700

SN - 0022-3115

VL - 445

SP - 104

EP - 110

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -