Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment

Zhong, Weicheng; Yang, Ying; Field, Kevin G.; Sridharan, Niyanth; Terrani, Kurt; Tan, Lizhen

doi:10.1016/j.msea.2021.141143

Title: Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment

Abstract

Substantial residual tensile stress tends to accumulate in currently available high-Cr ferritic martensitic steels that are subjected to cyclical heat treatment, which leads to premature brittle fracture. By tailoring the alloy composition, this thermal cycling can be exploited to induce a high number density of nanoprecipitates and phase transformations countering residual tensile stresses. In this work, three new variants of ferritic-martensitic steels have been designed with computational thermodynamics to meet the goals of mitigating residual tensile stresses by lowering martensite start temperatures and of enhancing mechanical strength and irradiation sink strength by increasing the number density of nanoprecipitates. Furthermore, ctenast materials were subjected to cyclical heat treatment. The thermally cycled samples were evaluated with mechanical testing and microstructural analysis to identify the optimal composition in which figures of merit include low residual stress and a high density of nanoscale MX (M = metal, X = C/N) precipitates, leading to high yield strength with reasonable ductility. The noticeably higher density of nanoprecipitates in the optimal alloy favor its higher yield strength, which is supported by the microstructure-derived yield strength calculation and precipitation kinetics simulation.

Authors:

^[1];

^[1]

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

Publication Date:: Tue Mar 23 00:00:00 EDT 2021

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

Sponsoring Org.:: USDOE Laboratory Directed Research and Development (LDRD) Program

OSTI Identifier:: 1814375

Alternate Identifier(s):: OSTI ID: 1815323

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

Additional Journal Information:: Journal Volume: 813; Journal ID: ISSN 0921-5093

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; tensile; charpy; precipitate; thermodynamics; kinetics

Citation Formats


                    Zhong, Weicheng, Yang, Ying, Field, Kevin G., Sridharan, Niyanth, Terrani, Kurt, and Tan, Lizhen. Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment.  United States: N. p., 2021. 
Web.  doi:10.1016/j.msea.2021.141143.

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                    Zhong, Weicheng, Yang, Ying, Field, Kevin G., Sridharan, Niyanth, Terrani, Kurt, & Tan, Lizhen. Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment.  United States.  https://doi.org/10.1016/j.msea.2021.141143

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                    Zhong, Weicheng, Yang, Ying, Field, Kevin G., Sridharan, Niyanth, Terrani, Kurt, and Tan, Lizhen. Tue .  
"Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment".  United States.  https://doi.org/10.1016/j.msea.2021.141143.  https://www.osti.gov/servlets/purl/1814375.

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@article{osti_1814375,

  title        = {Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment},

  author       = {Zhong, Weicheng and Yang, Ying and Field, Kevin G. and Sridharan, Niyanth and Terrani, Kurt and Tan, Lizhen},

  abstractNote = {Substantial residual tensile stress tends to accumulate in currently available high-Cr ferritic martensitic steels that are subjected to cyclical heat treatment, which leads to premature brittle fracture. By tailoring the alloy composition, this thermal cycling can be exploited to induce a high number density of nanoprecipitates and phase transformations countering residual tensile stresses. In this work, three new variants of ferritic-martensitic steels have been designed with computational thermodynamics to meet the goals of mitigating residual tensile stresses by lowering martensite start temperatures and of enhancing mechanical strength and irradiation sink strength by increasing the number density of nanoprecipitates. Furthermore, ctenast materials were subjected to cyclical heat treatment. The thermally cycled samples were evaluated with mechanical testing and microstructural analysis to identify the optimal composition in which figures of merit include low residual stress and a high density of nanoscale MX (M = metal, X = C/N) precipitates, leading to high yield strength with reasonable ductility. The noticeably higher density of nanoprecipitates in the optimal alloy favor its higher yield strength, which is supported by the microstructure-derived yield strength calculation and precipitation kinetics simulation.},

  doi          = {10.1016/j.msea.2021.141143},

  journal      = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},

  number       = ,

  volume       = 813,

  place        = {United States},

  year         = {Tue Mar 23 00:00:00 EDT 2021},

  month        = {Tue Mar 23 00:00:00 EDT 2021}

}

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Title: Microstructure and mechanical properties of high Mn-containing ferritic-martensitic alloys exposed to cyclical thermal treatment

Abstract

Citation Formats

Reduced-activation steels: Future development for improved creep strength journal, August 2008

Study on the effect of ageing on laves phase evolution and their effect on mechanical properties of P92 steel journal, February 2018

Nucleation Rate and Number of Precipitates in V and Nb-Microalloyed Steels journal, May 2014

Orientation relationship transition of nanometre sized interphase precipitated TiC carbides in Ti bearing steel journal, April 2010

Crystallography and morphology of nanosized Cr particles in a Cu–0.2% Cr alloy journal, March 2000

Materials challenges in nuclear energy journal, February 2013

Recent Developments in Irradiation-Resistant Steels journal, August 2008

The determination of dislocation densities in thin films journal, September 1961

Effects of alloying elements and thermomechanical treatment on 9Cr Reduced Activation Ferritic–Martensitic (RAFM) steels journal, November 2013

Martensite microstructure of 9–12%Cr steels weld metals journal, December 2006

Effects of carbonitrides and carbides on microstructure and properties of castable nanostructured alloys journal, November 2020

Effect of Ms Temperature on Residual Stress in Welded Joints of High-Strength Steels journal, March 2010

Quantitative TEM analysis of precipitation and grain boundary segregation in neutron irradiated EUROFER 97 journal, November 2014

Direct observation of creep strengthening nanoprecipitate formation in ausformed ferritic/martensitic steels journal, April 2019

Nucleation kinetics of Ti carbonitride in microalloyed austenite journal, April 1989

Uncertainties in dilatometric determination of martensite start temperature journal, May 2007

Enhancement of strength and ductility in ultrafine-grained T91 steel through thermomechanical treatments journal, July 2013

Effect of δ -ferrite on impact properties of supermartensitic stainless steel heat affected zones journal, October 2004

Conversion of MX nitrides to Z-phase in a martensitic 12% Cr steel journal, January 2010

European Fusion Power Plant Studies journal, April 2005

Microstructural stability of tantalum-alloyed ferritic-martensitic steel with neutron irradiation to 7.4 dpa at ~490 °C journal, March 2020

The Role of Dislocation Climb across Particles at Creep Conditions in 9 to 12 Pct Cr Steels journal, September 2007

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Thermal Vibrations in Substoichiometric Vanadium Nitrides. Dynamical Deformation Effect journal, October 1987

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Mechanical properties of irradiated ODS-EUROFER and nanocluster strengthened 14YWT journal, July 2009

The isotropic shear modulus of multicomponent Fe-base solid solutions journal, June 2002

Structural materials for fission & fusion energy journal, November 2009

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Carbon Enrichment in Retained Austenite Films in Low Carbon Lath Martensite Steel journal, January 2011

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Expression for solubility product of niobium carbonitride in austenite journal, April 1988

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Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels journal, March 2021

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Advances in Physical Metallurgy and Processing of Steels. Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel. journal, January 2001

The tempering of iron-nitrogen martensite; Dilatometric and calorimetric analysis journal, January 1990

Transformation-induced plasticity (TRIP) in advanced steels: A review journal, September 2020

Toughness and austenite stability of modified 9Cr–1Mo welds after tempering journal, July 2000

Microstructure control for high strength 9Cr ferritic–martensitic steels journal, March 2012

Radiological analysis and transmutation calculation of representative castable nanostructured alloys journal, November 2020

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Microstructural degradation of Gr.91 steel during creep under low stress journal, June 2011

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Materials challenges in nuclear energy
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Recent Developments in Irradiation-Resistant Steels
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Enhancement of strength and ductility in ultrafine-grained T91 steel through thermomechanical treatments
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European Fusion Power Plant Studies
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The Role of Dislocation Climb across Particles at Creep Conditions in 9 to 12 Pct Cr Steels
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Performance of a ferritic/martensitic steel for nuclear reactor applications fabricated using additive manufacturing
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Thermodynamic modeling and kinetics simulation of precipitate phases in AISI 316 stainless steels
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Thermo-Calc & DICTRA, computational tools for materials science
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Quantitative assessment of the effects of microstructure on the stability of retained austenite in TRIP steels
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Nanoscale analysis of ion irradiated ODS 14YWT ferritic alloy
journal, January 2020

Mechanisms of tempered martensite embrittlement in low alloy steels
journal, August 1978

The crystal structure of Cr23C6
journal, October 1972

High-resolution transmission electron microscopy study of crystallography and morphology of TiC precipitates in tempered steel
journal, June 2004

Mechanical properties of irradiated ODS-EUROFER and nanocluster strengthened 14YWT
journal, July 2009

The isotropic shear modulus of multicomponent Fe-base solid solutions
journal, June 2002

Structural materials for fission & fusion energy
journal, November 2009

Residual stress distributions in a P91 steel-pipe girth weld before and after post weld heat treatment
journal, February 2012

Carbon Enrichment in Retained Austenite Films in Low Carbon Lath Martensite Steel
journal, January 2011

Fabrication and characterization of reference 9Cr and 12Cr-ODS low activation ferritic/martensitic steels
journal, October 2014

Expression for solubility product of niobium carbonitride in austenite
journal, April 1988

Relationship between austenite stability and martensite formation in modified 9Cr-1Mo steel
journal, March 2014

Role of evolving microstructure on the mechanical properties of electron beam welded ferritic-martensitic steel in the as-welded and post weld heat-treated states
journal, June 2017

Effects of niobium and tantalum on the microstructure and strength of ferritic-martensitic steels
journal, March 2021

Electron densities in VN. I. High-precision x-ray-diffraction determination of the valence-electron density distribution and atomic displacement parameters
journal, July 1987

Advances in Physical Metallurgy and Processing of Steels. Strengthening Mechanisms of Creep Resistant Tempered Martensitic Steel.
journal, January 2001

The tempering of iron-nitrogen martensite; Dilatometric and calorimetric analysis
journal, January 1990

Transformation-induced plasticity (TRIP) in advanced steels: A review
journal, September 2020

Toughness and austenite stability of modified 9Cr–1Mo welds after tempering
journal, July 2000

Microstructure control for high strength 9Cr ferritic–martensitic steels
journal, March 2012

Radiological analysis and transmutation calculation of representative castable nanostructured alloys
journal, November 2020

Calculation of the effect of alloying elements on the Ms temperature in steels
journal, April 1995

Microstructural degradation of Gr.91 steel during creep under low stress
journal, June 2011

Modelling the overlap of nucleation, growth and coarsening during precipitation
journal, September 2004

Designing Radiation Resistance in Materials for Fusion Energy
journal, July 2014

Stability of MX-type strengthening nanoprecipitates in ferritic steels under thermal aging, stress and ion irradiation
journal, June 2014

Elevated temperature ferritic and martensitic steels and their application to future nuclear reactors
journal, October 2005