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Journal of Materials Engineering and Performance

, Volume 24, Issue 12, pp 4710–4720 | Cite as

In Situ Tensile Deformation and Residual Stress Measurement by Neutron Diffraction in Modified 9Cr-1Mo Steel

  • Triratna Shrestha
  • Indrajit CharitEmail author
  • Gabriel Potirniche
Article

Abstract

The deformation behavior of monolithic modified 9Cr-1Mo (Grade 91) steel during uniaxial tensile loading was studied using the in situ neutron diffraction technique. The residual stress distribution across gas tungsten arc welds in the Grade 91 steel was measured by the time-of-flight neutron diffraction method using the SMARTS diffractometer at Lujan Neutron Scattering Center, Los Alamos National Laboratory. Grade 91 plates were welded using the gas tungsten arc welding (GTAW) technique. The load sharing by different grain orientations was observed during the tensile loading. The residual stresses along three orthogonal directions were determined at the mid-thickness, 4.35 and 2.35 mm below the surface of both the as-welded and post-weld heat-treated plates. The residual stresses of the as-welded plates were compared with those of the post-weld heat-treated plates. The post-weld heat treatment significantly reduced the residual stress level in the base metal, the heat-affected zone, and the weld zone. Vickers microhardness across the weld zone of the as-welded and post-weld heat-treated specimens was evaluated and correlated with the observed residual stress profile and microstructure.

Keywords

modified 9Cr-1Mo neutron diffraction residual stress steel welding 

Notes

Acknowledgments

This work has benefited from the use of the SMARTS facility at the Lujan Neutron Scattering Center at Los Alamos Neutron Science Center, funded by the DOE Office of Basic Energy Sciences. Los Alamos National Laboratory is operated by Los Alamos National Security LLC under DOE Contract DE-AC52-06NA25396. This research was performed using funding received from the DOE Office of Nuclear Energy’s Nuclear Energy University Programs (NEUP) through the US Department of Energy Grant no. 42246 release 59. The first author (TS) would like to acknowledge the assistance provided by Bjorn Clausen, Donald W. Brown, and Thomas A. Sisneros of the Lujan Scattering Center during the course of this study.

References

  1. 1.
    I. Charit and K.L. Murty, Structural Materials Issues for the Next Generation Fission Reactors, JOM, 2010, 62, p 67–74CrossRefGoogle Scholar
  2. 2.
    E. Barker, Creep Fracture of 9Cr-1Mo Steel, Mater. Sci. Eng., 1986, 84, p 49–64CrossRefGoogle Scholar
  3. 3.
    R.L. Klueh, Elevated Temperature Ferritic and Martensitic Steels and Their Application to Future Nuclear Reactors, Int. Mater. Rev., 2005, 50, p 287–310CrossRefGoogle Scholar
  4. 4.
    S. Sathyanarayanan, A. Moitra, K.G. Samuel, G. Sasikala, S.K. Ray, and V. Singh, Evaluation of Dynamic Fracture Toughness Based Reference Temperature (\(T_{0}^{\text{dy}}\) of Modified 9Cr-1Mo Steel in Phosphorus Embrittled and Cold-worked Condition, Mater. Sci. Eng. A, 2008, 488, p. 519–528Google Scholar
  5. 5.
    K.L. Murty and I. Charit, Structural Materials for Gen-IV Nuclear Reactors: Challenges and Opportunities, J. Nucl. Mater., 2008, 383, p 189–195CrossRefGoogle Scholar
  6. 6.
    K. Laha, K.S. Chandravathi, P. Parameswaran, and K. Bhanu, Sankara Rao, and S.L. Mannan, Characterization of Microstructures Across the Heat-Affected Zone of the Modified 9Cr-1Mo Weld Joint to Understand Its Role in Promoting Type IV Cracking, Metall. Mater. Trans. A, 2007, 38, p 58–68CrossRefGoogle Scholar
  7. 7.
    S.-H. Kim, J.-B. Kim, and W.-J. Lee, Numerical Prediction and Neutron Diffraction Measurement of the Residual Stresses for a Modified 9Cr-1Mo Steel Weld, J. Mater. Process. Technol., 2009, 209, p 3905–3913CrossRefGoogle Scholar
  8. 8.
    G.E. Dieter, Mechanical Metallurgy, McGraw-Hill Book Company, New York, 1961CrossRefGoogle Scholar
  9. 9.
    P.J. Withers, Residual Stress and Its Role in Failure, Rep. Prog. Phys., 2007, 70, p 2211–2264CrossRefGoogle Scholar
  10. 10.
    A.D. Krawitz, Introduction to Diffraction in Materials Science and Engineering, 1st ed., Wiley, New York, 2001Google Scholar
  11. 11.
    B. Clausen, D.W. Brown, and I.C. Noyan, Engineering Applications of Time-of-Flight Neutron Diffraction, JOM, 2012, 64(1), p 117–126CrossRefGoogle Scholar
  12. 12.
    L. Pintschovius, Macrostresses, microstresses and stress tensors, Measurement of Residual and Applied Stress Using Neutron Diffraction, M.T. Hutchings and A.D. Krawitz, Ed., Kluwer Academics Publishers, Boston, 1992, p 115–130CrossRefGoogle Scholar
  13. 13.
    H.M. Rietveld, A Profile Refinement Method for Nuclear and Magnetic Structures, J. Appl. Cryst., 1969, 2, p 65–71CrossRefGoogle Scholar
  14. 14.
    E.L. Pavlina and C.J. Van Tune, Correlation of Yield Strength and Tensile Strength with Hardness for Steels, J. Mater. Eng. Perform., 2008, 17(6), p 888–893CrossRefGoogle Scholar
  15. 15.
    T. Shrestha, M. Basirat, I. Charit, G.P. Potirniche, K.K. Rink, and U. Sahaym, Creep Deformation Mechanisms in Modified 9Cr-1Mo Steel, J. Nucl. Mater., 2012, 423, p 110–119CrossRefGoogle Scholar
  16. 16.
    S. Alsagabi, T. Shrestha, and I. Charit, High Temperature Tensile Deformation Behavior of Grade 92 Steel, J. Nucl. Mater., 2014, 453, p 151–157CrossRefGoogle Scholar
  17. 17.
    B. Clausen, D.W. Brown, M.A.M. Bourke, T.A. Saleh, and S.A. Maloy, In Situ Neutron Diffraction and Elastic-Plastic Self-Consistent Polycrystal Modeling of HT-9, J. Nucl. Mater., 2012, 425, p 228–232CrossRefGoogle Scholar
  18. 18.
    M.R. Daymond and P.J. Bouchard, Elastoplastic Deformation of 316 Stainless Steel Under Tensile Loading at Elevated Temperature, Metall. Mater. Trans. A, 2006, 37, p 1863–1873CrossRefGoogle Scholar
  19. 19.
    P.A. Turner and C.N. Tome, Study of Residual Stresses in Zircaloy-2 with Rod Texture, Acta Mater., 1994, 42, p 4143–4153CrossRefGoogle Scholar
  20. 20.
    A.R. Pyzalla, Internal stresses in engineering materials, Neutrons and Synchrotron Radiation in Engineering Materials Science, W. Reimers, A.R. Pyazalla, A. Schreyer, and H. Clemens, Ed., Wiley, Weinheim, 2008, p 21–56CrossRefGoogle Scholar
  21. 21.
    H. Dai, J.A. Francis, H.J. Stone, H.K.D.H. Bhadeshia, and P.J. Withers, Characterizing Phase Transformation and Their Effects on Ferritic Weld Residual Stresses with X-Rays and Neutrons, Metall. Mater. Trans. A, 2008, 39, p 3070–3078CrossRefGoogle Scholar
  22. 22.
    N.S. Rossini, M. Dassisti, K.Y. Benyounis, and A.G. Olabi, Methods of Measuring Residual Stresses in Components, Mater. Des., 2012, 35, p 572–588CrossRefGoogle Scholar
  23. 23.
    S. Paddea, J.A. Francis, A.M. Paradowska, P.J. Bouchard, and I.A. Shibi, Residual Stress Distributions in a P91 Steel-Pipe Girth Weld Before and After Post Weld Heat Treatment, Mater. Sci. Eng. A, 2012, 534, p 663–672CrossRefGoogle Scholar
  24. 24.
    A.H. Yaghi, T.H. Hyde, A.A. Becker, and W. Sun, Finite Element Simulation of Welded P91 Steel Pipe Undergoing Post-Weld Heat Treatment, Sci. Technol. Weld. Join., 2011, 16(3), p 232–238CrossRefGoogle Scholar
  25. 25.
    J.W.H. Price, A. Paradowska, S. Joshi, and T. Finlayson, Residual Stresses Measurement by Neutron Diffraction and Theoretical Estimation in a Single Weld Bead, Int. J. Press. Vessel. Pip., 2006, 83, p 381–387CrossRefGoogle Scholar
  26. 26.
    R.J. Moat, D.J. Hughes, A. Steuwer, N. Iqbal, M. Preuss, S.E. Bray, and M. Rawson, Residual Stresses in Inertial-Friction-Welded Dissimilar High-Strength Steels, Metall. Mater. Trans. A, 2009, 40, p 2098–2108CrossRefGoogle Scholar
  27. 27.
    D.J. Smith and S.J. Garwood, Influence of Post-Welded Heat Treatment on the Variation of Residual Stressed in 50 mm Thick Welded Ferritic Steel Plates, Int. J. Press. Vessel. Pip., 1992, 51, p 241–256CrossRefGoogle Scholar
  28. 28.
    E.J. McDonald, L.F. Exworthy, P.E.J. Flewitt, K. Hallam, and W. Bell, Measurement of Residual Stresses in a Multi-Pass Low Alloy Ferritic Steel Weld Using x-ray Diffraction, Mater. Sci. Forum, 2000, 347–349, p 664–669CrossRefGoogle Scholar
  29. 29.
    X. Ficquet, C.E. Truman, and D.J. Smith, Measurement of Residual Stress in an A533B Ferritic Steel Plate Containing a Repair Weld, Mater. Sci. Forum, 2006, 524–525, p 653–658CrossRefGoogle Scholar
  30. 30.
    M. Turski, A.H. Sherry, P.J. Bouchard, and P.J. Withers, Residual Stress Driven Creep Cracking in Type 316 Stainless Steel, J. Neutron Res., 2004, 12(1–3), p 45–49CrossRefGoogle Scholar
  31. 31.
    P.J. Bouchard, P.J. Withers, S.A. McDonald, and R.K. Heenan, Quantification of Creep Cavitation Damage Around a Crack in a Stainless Steel Pressure Vessel, Acta Mater., 2004, 52(1), p 23–34CrossRefGoogle Scholar
  32. 32.
    S.K. Albert, M. Matsui, H. Hongo, T. Watanabe, K. Kubo, and M. Tabuchi, Creep Rupture Properties of HAZs of a High Cr Ferritic Steel Simulated by a Weld Simulator, Int. J. Press. Vessel. Pip., 2004, 81, p 221–234CrossRefGoogle Scholar
  33. 33.
    D. Li and K. Shinozaki, Simulation of Role of Precipitation in Creep Void Occurrence in Heat Affected Zone of High Cr Ferritic Heat Resistant Steels, Sci. Technol. Weld. Join., 2005, 10(5), p 544–549CrossRefGoogle Scholar
  34. 34.
    T. Watanabe, M. Yamazaki, H. Hongo, M. Tabuchi, and T. Tanabe, Effect of Stress on Microstructural Change Due to Aging at 823 K in Multi-layer Welded Joint of 2.25Cr-1Mo Steel, Int. J. Press. Vessel. Pip., 2004, p. 279–284.Google Scholar
  35. 35.
    Y. Tomota, H. Tokuda, Y. Adachi, M. Wakita, N. Minakawa, A. Moriai, and Y. Morii, Tensile Behavior of TRIP-Aided Multi-phase Steels Studied by In Situ Neutron Diffraction, Acta Mater., 2004, 52, p 5737–5745CrossRefGoogle Scholar
  36. 36.
    S.A. David and T. Debroy, Current Issues and Problems in Welding Science, Science, 1992, 257, p 497–502CrossRefGoogle Scholar
  37. 37.
    M. Regev, S. Berger, and B.Z. Weiss, Investigation of Microstructure Mechanical and Creep Properties of Weldments Between T91 and T22 Steels, Weld. J., 1996, 75, p 261s–268sGoogle Scholar
  38. 38.
    T. Sato, K. Tamura, Advances in Materials Technology for Fossil Power Plants, Proceedings of the 5th International Conference, Oct. 3-5, 2007, (Marco Island, FL, USA) ASM Int., 2008, p. 874–883.Google Scholar
  39. 39.
    D. Dean and M. Hidekazu, Prediction of Welding Residual Stress in Multi-pass Butt-Welded Modified 9Cr-1Mo Steel Pipe Considering Phase Transformation Effects, Comput. Mater. Sci., 2006, 37, p 209–219CrossRefGoogle Scholar
  40. 40.
    M. Sireesha, S.K. Albert, and S. Sundaresan, Microstructure and Mechanical Properties of Weld Fusion Zones in Modified 9Cr-1Mo Steel, J. Mater. Eng. Perform., 2001, 10(3), p 320–330CrossRefGoogle Scholar

Copyright information

© ASM International 2015

Authors and Affiliations

  • Triratna Shrestha
    • 1
    • 3
  • Indrajit Charit
    • 1
    Email author
  • Gabriel Potirniche
    • 2
  1. 1.Department of Chemical and Materials EngineeringUniversity of IdahoMoscowUSA
  2. 2.Department of Mechanical EngineeringUniversity of IdahoMoscowUSA
  3. 3.Integrated Global ServicesRichmondUSA

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