Recently, demand for a nondestructive technique to detect and evaluate plastic strain and/or cyclic strain damage with high accuracy has increased. A potentiostatic etching technique for the detection and evaluation of plastic strain in austenitic stainless steels was developed in a previous study. Using this technique, many etched deformation twins would appear on a specimen that was pre-strained at room temperature and many etched slip lines would appear on a specimen that was pre-strained at a higher temperature, and plastic strain could be evaluated based on the density of these etched lines. In the present study, the appli-cability of the potentiostatic etching technique to determine the accumulated plastic strain by cyclic pre-straining was investigated. The results indicate that the potentiostatic etching technique is appli-cable for the evaluation of low-cycle fatigue in the very early stages of fatigue life.
Heino, S., and B. Karlsson, 2001, “Cyclic Deformation and Fatigue Behav-iour of 7Mo–0.5N Superaustenitic Stainless Steel—Slip Characteristics and Development of Dislocation Structures,” Acta Materialia, Vol. 49, No. 2, pp. 353–363.
Hokari, Shota, Akiyoshi Suzuki, and Yutaka Watanabe, 2016, “Nondestruc-tive Potentiostatic Etching Technique for the Detection and Quantification of Preexisting Plastic Strain in Austenitic Stainless Steel,” Materials Evalua-tion, Vol. 74, No. 9, pp.1287–1295.
IAEA, “Earthquake Preparedness and Response for Nuclear Power Plants,” 2011, IAEA Safety Report Series No. 66, International Atomic Emergency Agency, Vienna, Austria.
Japan Nuclear Technology Institute, 2009, “Structural Integrity Assess-ment Committee for Nuclear Components Damaged by Earthquake
(SANE): Interim Report of Structural Integrity of the Nuclear Power Station after the Niigataken Chuetsu-oki Earthquake,” Tokyo, Japan (in Japanese).
Kim, Jin-Yeon, Laurence J. Jacobs, Jianmin Qu, and Jerrol W. Littles, 2006, “Experimental Characterization of Fatigue Damage in a Nickel-base Super-alloy using Nonlinear Ultrasonic Waves,” The Journal of the Acoustical Society of America, Vol. 120, No. 3, pp. 1266–1273.
Koyama, Motomichi, Takahiro Sawaguchi, and Kaneaki Tsuzaki, 2012, “TWIP Effect and Plastic Instability Condition in an Fe-Mn-C Austenitic Steel,” Tetsu-to-Hagané, Vol. 98, No. 6, pp. 229–235.
Nuclear and Industrial Safety Agency, 2009, “Measures of the Nuclear and Industrial Safety Agency concerning the Kashiwazaki-Kariwa Nuclear Power Station, Affected by the Niigataken Chuetsu-oki Earthquake (Interim Report),” Tokyo, Japan. Available at http://www.gengikyo.jp/archive/soundnessreport.html.
Taniguchi, Tomoatsu, Yoshihisa Kaneko, and Satoshi Hashimoto, 2009, “Preferential Fatigue Crack Nucleation at Deformation Twins in a Ferritic Stainless Steel,” The Journal of the Japan Institute of Metals, Vol. 73, No. 12, pp. 930–937.
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