skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Development of new generation reduced activation ferritic-martenstic steels for advanced fusion reactors

Journal Article · · Journal of Nuclear Materials
 [1];  [2];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

International development of reduced activation ferritic-martensitic (RAFM) steels has focused on 9 wt percentage Cr, which primarily contain M23C6 (M = Cr-rich) and small amounts of MX (M = Ta/V, X = C/N) precipitates, not adequate to maintain strength and creep resistance above ~500 °C. To enable applications at higher temperatures for better thermal efficiency of fusion reactors, computational alloy thermodynamics coupled with strength modeling have been employed to explore a new generation RAFM steels. The new alloys are designed to significantly increase the amount of MX nanoprecipitates, which are manufacturable through standard and scalable industrial steelmaking methods. Preliminary experimental results of the developed new alloys demonstrated noticeably increased amount of MX, favoring significantly improved strength, creep resistance, and Charpy impact toughness as compared to current RAFM steels. Furthermore, the strength and creep resistance were comparable or approaching to the lower bound of, but impact toughness was noticeably superior to 9–20Cr oxide dispersion-strengthened ferritic alloys.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1255666
Alternate ID(s):
OSTI ID: 1325370
Journal Information:
Journal of Nuclear Materials, Vol. 478; ISSN 0022-3115
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 94 works
Citation information provided by
Web of Science

References (40)

Low-activation ferritic and martensitic steels for fusion application journal October 1996
Impurity effects on reduced-activation ferritic steels developed for fusion applications journal August 2000
Stability of MX-type strengthening nanoprecipitates in ferritic steels under thermal aging, stress and ion irradiation journal June 2014
Coarsening of precipitates in an advanced creep resistant 9% chromium steel—quantitative microscopy and simulations journal August 2002
Recent Developments in Irradiation-Resistant Steels journal August 2008
Microstructure of oxide dispersion strengthened Eurofer and iron–chromium alloys investigated by means of small-angle neutron scattering and transmission electron microscopy journal September 2011
Creep mechanisms of ferritic oxide dispersion strengthened alloys journal February 2003
Characterization of oxide nanoprecipitates in an oxide dispersion strengthened 14YWT steel using aberration-corrected STEM journal September 2012
Designing Radiation Resistance in Materials for Fusion Energy journal July 2014
Effect of thermomechanical treatment on 9Cr ferritic–martensitic steels journal October 2013
Creep-strengthening of steel at high temperatures using nano-sized carbonitride dispersions journal July 2003
Effect of tungsten and tantalum on the low cycle fatigue behavior of reduced activation ferritic/martensitic steels journal May 2012
The effect of tungsten on dislocation recovery and precipitation behavior of low-activation martensitic 9Cr steels journal October 1991
Development of India-specific RAFM steel through optimization of tungsten and tantalum contents for better combination of impact, tensile, low cycle fatigue and creep properties journal August 2013
Effect of tungsten on tensile properties and flow behaviour of RAFM steel journal February 2013
Effect of fine precipitation and subsequent coarsening of Fe2W laves phase on the creep deformation behavior of tempered martensitic 9Cr-W steels journal February 2005
Effect of thermal aging on the microstructure and mechanical properties of 7–11 CrW steels journal December 2000
Influence of tantalum and nitrogen contents, normalizing condition and TMCP process on the mechanical properties of low-activation 9Cr–2W–0.2V–Ta steels for fusion application journal October 1998
Effects of alloying elements and thermomechanical treatment on 9Cr Reduced Activation Ferritic–Martensitic (RAFM) steels journal November 2013
Effect of W and Ta on creep–fatigue interaction behavior of reduced activation ferritic–martensitic (RAFM) steels journal November 2015
Effect of silicon on the microstructure and mechanical properties of reduced activation ferritic/martensitic steel journal April 2015
Precipitation behavior of laves phase and its effect on toughness of 9Cr-2Mo Ferritic-martensitic steel journal November 1986
Thermodynamic modeling and kinetics simulation of precipitate phases in AISI 316 stainless steels journal May 2014
Reduced-activation steels: Future development for improved creep strength journal August 2008
Microstructure control for high strength 9Cr ferritic–martensitic steels journal March 2012
Conversion of MX nitrides to Z-phase in a martensitic 12% Cr steel journal January 2010
Effect of creep deformation on Z phase formation in Gr.91 steel journal December 2013
High-temperature mechanical properties and microstructure of 9Cr oxide dispersion strengthened steel compared with RAFMs journal October 2011
Advances in Physical Metallurgy and Processing of Steels. Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel. journal January 2001
The relation between polycrystal deformation and single-crystal deformation journal May 1970
Formulating the strength factor α for improved predictability of radiation hardening journal October 2015
TEM characterization of precipitates in EUROFER 97 journal May 2012
Quantitative TEM analysis of precipitation and grain boundary segregation in neutron irradiated EUROFER 97 journal November 2014
Materials design data for reduced activation martensitic steel type F82H journal November 2002
Oxide dispersion-strengthened steels: A comparison of some commercial and experimental alloys journal May 2005
Present development status of EUROFER and ODS-EUROFER for application in blanket concepts journal November 2005
Thermal creep behaviour of the EUROFER 97 RAFM steel and two European ODS EUROFER 97 steels journal November 2005
Effects of carbide precipitation on the strength and Charpy impact properties of low carbon Mn–Ni–Mo bainitic steels journal August 2001
Effect of Carbide Size Distribution on the Impact Toughness of Tempered Martensitic Steels with Two Different Prior Austenite Grain Sizes Evaluated by Instrumented Charpy Test journal January 2013
Notch Impact Behavior of Oxide-Dispersion-Strengthened (ODS) Fe20Cr5Al Alloy journal June 2013

Cited By (2)

A Novel Low-Activation VCrFeTaxWx (x = 0.1, 0.2, 0.3, 0.4, and 1) High-Entropy Alloys with Excellent Heat-Softening Resistance journal December 2018
Evaluation of Hot Deformation and Dynamic Recrystallization Behaviors of Advanced Reduced-Activated Alloy (ARAA) journal January 2019

Similar Records

Recent status and improvement of reduced-activation ferritic-martensitic steels for high-temperature service
Journal Article · Tue Jul 26 00:00:00 EDT 2016 · Journal of Nuclear Materials · OSTI ID:1255666

Effects of carbonitrides and carbides on microstructure and properties of castable nanostructured alloys
Journal Article · Wed Jul 15 00:00:00 EDT 2020 · Journal of Nuclear Materials · OSTI ID:1255666

Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment
Journal Article · Tue Mar 23 00:00:00 EDT 2021 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing · OSTI ID:1255666