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Nondestructive Potentiostatic Etching Technique for the Detection and Quantification of Preexisting Plastic Strain in Austenitic Stainless Steel

Nondestructive testing (NDT) of preexisting plastic strain with high accuracy and low heat-to-heat variation is important for ensuring the integrity of structural components. In the present study, a potentiostatic etching technique (1N HNO3 at –600 mVSCE, 308 K [35 °C] for 20 min) was developed for NDT of plastic strain in austenitic stainless steel. It was found that the dissolution rate of the alloy is strongly dependent on crystallographic orientation with the developed potentiostatic etching condition, and the potentiostatic etching condition was employed to visualize slight and local disarray of crystal structure caused by plastic deformation. Using this etching technique, preexisting plastic strain in austenitic stainless steel can be detected and quantified based on the density of etched deformation twins for samples strained at room temperature. It was also found that preexisting plastic strain in austenitic stainless steel that was deformed at 523 K (250 °C) could be detected and quantified using the etched slip line density. Over the temperature range of straining from 303 to 373 K (30 to 100 °C), the etched deformation twin density drastically decreased as temperature was increased. This result indicates a notable slip-twinning transition in SUS316NG over the temperature range of 303 to 373 K (30 to 100 °C). This technique was also found to have high sensitivity and low heat dependency in detection of preexisting strain.

  • Allain, S., J.-P. Chateau, and O. Bouaziz, “Correlations Between the Calculated Stacking Fault Energy and the Plasticity Mechanisms in Fe-Mn-C Alloys,” Materials Science and Engineering A, Vol. 387–389, 2004, pp. 158–162.
  • Binnig, G., C.F. Quate, and Ch. Gerber, “Atomic Force Microscope,” Physical Review Letters, Vol. 56, 1986, pp. 930–933.
  • Bolling, G.F., and R.H. Richman, “Continual Mechanical Twinning, Part I: Formal Description,” Acta Metallurgica, Vol. 13, 1965a, pp. 709–722.
  • Bolling, G.F., and R.H. Richman, “Continual Mechanical Twinning, Part II: Standard Experiments,” Acta Metallurgica, Vol. 13, 1965b, pp. 723–743.
  • Byun, T.S., “On the Stress Dependence of Partial Dislocation Separation and Deformation Microstructure in Austenitic Stainless Steels,” Acta Materialia, Vol. 51, 2003, pp. 3063–3071.
  • Byun, T.S., E.H. Lee, and J.D. Hunn, “Plastic Deformation in 316LN Stainless Steel – Characterization of Deformation Microstructures,” Journal of Nuclear Materials, Vol. 321, 2003, pp. 29–39.
  • Christian, J.W., and S. Mahajan, “Deformation Twinning,” Progress in Materials Science, Vol. 39, 1995, pp. 1–157.
  • IAEA, “Earthquake Preparedness and Response for Nuclear Power Plants,” Safety Report Series No. 66, International Atomic Energy Agency, Vienna, Austria, 2011.
  • JANTI, “Interim Report of Structural Integrity of the Nuclear Power Station after the Niigataken Chuetsu-oki Earthquake,” Japan Nuclear Technology Institute, Structural Integrity Assessment Committee for Nuclear Components damaged by Earthquake Tokyo, Japan, April 2009 (in Japanese).
  • Kamaya, M., “Observation of Low-cycle Fatigue Damage by EBSD (Microstructural Change in SUS316 and STS410),” Transactions of the Japan Society of Mechanical Engineers A, Vol. 77, 2011, pp. 154–169.
  • Kireeva, L.V., and Y.I. Chumlyakov, “Effect of Nitrogen and Stacking-fault Energy on Twinning in [111] Single Crystals of Austenitic Stainless Steels,” Physics of Metals and Metallography, Vol. 108, 2009, pp. 298–309.
  • Komazaki, S., Y. Watanabe, and T. Shoji, “Changes in Slip Band Etching Characteristics of Inconel 718 due to High-temperature Low-cycle Fatigue,” Transactions of the Japan Society of Mechanical Engineers A, Vol. 63, 1997, pp. 1481–1488.
  • Koyama, M., T. Sawaguchi, and K. Tsuzaki, “TWIP Effect and Plastic Instability Condition in an Fe-Mn-C Austenitic Steel,” Tetsu-to-Hagané, Vol. 98, 2012, pp. 229–236.
  • Mohammed, A.A.S., E.A. El-Danaf, and A.A. Radwan, “Equivalent Twinning Criteria for FCC Alloys under Uniaxial Tension at High Temperatures,” Journal of Materials Science and Engineering A, Vol. 457, 2007, pp. 373–379.
  • NISA, “Measures of the Nuclear and Industrial Safety Agency concerning the Kashiwazaki-Kariwa Nuclear Power Station, Affected by the Niigataken Chuetsu-oki Earthquake (Interim Report),” Nuclear and Industrial Safety Agency, Tokyo, Japan, February 2009.
  • Park, K.-T., G. Kim, S.K. Kim, S.W. Lee, S.W., Hwang, and C.S. Lee, “On the Transitions of Deformation Modes of Fully Austenitic Steels at Room Temperature,” Metals and Materials International, Vol. 16, 2010, pp. 1–6.
  • Remy, L., “Kinetics of F.C.C. Deformation Twinning and Its Relationship to Stress-strain Behavior,” Acta Metallurgica, Vol. 26, 1978, pp. 443–51.
  • Schramm, R.E., and R.P. Reed, “Stacking Fault Energies of Seven Commercial Austenitic Stainless Steels,” Metallurgical Transactions A, Vol. 6A, 1975, pp. 1345–1351.
  • Yoshitake, M., T. Tsuchiyama, and S. Takaki, “Effect of Carbon and Nitrogen on Work Hardening and Deformation Microstructure in Stable Austenitic Stainless Steels,” Tetsu-to-Hagané, Vol. 98, 2012, pp. 223–228.
  • Zhang, Y., N.R. Tao, and K. Lu, “Effects of Stacking Fault Energy, Strain Rate and Temperature on Microstructure and Strength of Nano Structured Cu-Al Alloys Subjected to Plastic Deformation,” Acta Materialia, Vol. 59, 2011, pp. 6048–6058.
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