Synchrotron study on load partitioning between ferrite/martensite and nanoparticles of a 9Cr ODS steel

Abstract Oxide dispersion strengthened (ODS) steels exhibit exceptional radiation resistance and high-temperature creep strength when compared to traditional ferritic and ferritic/martensitic (F/M) steels. Their excellent mechanical properties result from very fine nanoparticles dispersed within the matrix. In this work, we applied a high-energy synchrotron radiation X-ray to study the deformation process of a 9Cr ODS steel. The load partitioning between the ferrite/martensite and the nanoparticles was observed during sample yielding. During plastic deformation, the nanoparticles experienced a dramatic loading process, and the internal stress on the nanoparticles increased to a maximum value of 3.7 GPa, which was much higher than the maximum applied stress (∼986 MPa). After necking, the loading capacity of the nanoparticles was significantly decreased due to a debonding of the particles from the matrix, as indicated by a decline in lattice strain/internal stress. Due to the load partitioning, the ferrite/martensite slightly relaxed during early yielding, and slowly strained until failure. This study develops a better understanding of loading behavior for various phases in the ODS F/M steel.

[1]  J. Ilavsky,et al.  Lattice strain and damage evolution of 9-12%Cr ferritic/martensitic steel during in situ tensile test by X-ray diffraction and small angle scattering , 2010 .

[2]  J. Almer,et al.  In situ characterization of Grade 92 steel during tensile deformation using concurrent high energy X-ray diffraction and small angle X-ray scattering , 2013 .

[3]  W. A. Theiner,et al.  Structural and Residual Stress Analysis by Nondestructive Methods , 2014 .

[4]  M. Daymond.  The determination of a continuum mechanics equivalent elastic strain from the analysis of multiple diffraction peaks , 2004 .

[5]  M. Mathon,et al.  Assessment of ODS-14%Cr ferritic alloy for high temperature applications , 2004 .

[6]  David S. Gelles,et al.  Status of reduced activation ferritic/martensitic steel development , 2007 .

[7]  K. Liss,et al.  Structural origins for the high plasticity of a Zr–Cu–Ni–Al bulk metallic glass , 2013 .

[8]  Mark R. Daymond,et al.  Load partitioning between ferrite and cementite during elasto-plastic deformation of an ultrahigh-carbon steel , 2007 .

[9]  M. Tamura,et al.  Decomposition of Y2Ti2O7 Particles in 8 Pct Cr Oxide-Dispersion-Strengthened Martensitic Steel during Tempering , 2011 .

[10]  Thermo-mechanical processing in a synchrotron beam , 2010 .

[11]  Brian D. Wirth,et al.  Recent Developments in Irradiation-Resistant Steels , 2008 .

[12]  J. Almer,et al.  Temperature and particle size effects on flow localization of 9–12%Cr ferritic/martensitic steel by in situ X-ray diffraction and small angle scattering , 2010 .

[13]  U. F. Kocks,et al.  The effect of dislocation self-interaction on the Orowan stress , 1973 .

[14]  J. Cohen,et al.  Residual Stress: Measurement by Diffraction and Interpretation , 1987 .

[15]  P. Withers,et al.  Introduction to the Characterization of Residual Stress by Neutron Diffraction , 2005 .

[16]  L. M. Brown,et al.  The work-hardening of copper-silica: IV. The Bauschinger effect and plastic relaxation , 1974 .

[17]  B. Clausen,et al.  Load sharing in tungsten fiber reinforced Kanthal composites , 2006 .

[18]  M. Daymond,et al.  Lattice strain evolution during uniaxial tensile loading of stainless steel , 1999 .

[19]  K. Niihara,et al.  Mechanical properties of Y2Ti2O7 , 2011 .

[20]  Laurent Proville,et al.  Dislocation depinning from ordered nanophases in a model fcc crystal: From cutting mechanism to Orowan looping , 2010 .

[21]  Michael E. Fitzpatrick,et al.  Analysis of Residual Stress by Diffraction using Neutron and Synchrotron Radiation , 2003 .

[22]  Steven J. Zinkle,et al.  Materials Challenges for Advanced Nuclear Energy Systems , 2009 .

[23]  Mark R. Daymond,et al.  Use of Rietveld refinement for elastic macrostrain determination and for evaluation of plastic strain history from diffraction spectra , 1997 .

[24]  Stephen Z. D. Cheng,et al.  An assessment of the contributing factors to the superior properties of a nanostructured steel using in situ high-energy X-ray diffraction , 2010 .

[25]  Emmanuelle A. Marquis,et al.  Nuclear reactor materials at the atomic scale , 2009 .

[26]  S. Zinkle,et al.  What is the Limit of Nanoparticle Strengthening , 2009 .

[27]  J. Almer,et al.  Synchrotron Radiation Study on Alloy 617 and Alloy 230 for VHTR Application , 2013 .

[28]  M. L. Young,et al.  Load partitioning in Al2O3-Al composites with three-dimensional periodic architecture , 2009 .

[29]  Sudook A. Kim,et al.  Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and α-iron , 2007 .

[30]  David C. Dunand,et al.  Load partitioning during compressive loading of a Mg/MgB2 composite , 2007 .

[31]  Shigeharu Ukai,et al.  Perspective of ODS alloys application in nuclear environments , 2002 .

[32]  Hugh O. Pierson,et al.  Handbook of Refractory Carbides and Nitrides: Properties, Characteristics, Processing and Applications , 1996 .