Abstract
The majority of data reported in open literature on hydride embrittlement of Zr alloys is based on hydrogen not deuterium which evolves during aqueous corrosion of in-core components in pressurized heavy water reactor operations. It is assumed that hydrogen and deuterium have similar effects on tensile properties and fracture toughness of Zr alloys. The thermal and physical properties as well as stress free transformation strain of hydrides and deuterides are different. Because of these differences, hydrogen and deuterium may affect tensile and fracture properties of Zr alloys to a different extent. The hydrogen isotope effects on tensile and fracture properties were investigated using samples machined from Zr–2.5Nb pressure tube (PT) material charged with hydrogen between 30 and 200 wppm and tests were carried out between 25 and 300 °C. The tensile properties and fracture toughness of the hydrogen charged Zr–2.5Nb PT material were compared to the Zr–2.5Nb PT material charged with deuterium. The observed effect of hydrogen isotopes on tensile and fracture toughness was rationalized in terms of stress free transformation strain and the temperature dependence of the fracture toughness of the hydrided material was correlated with the presence of axial splits on fracture surfaces.
Graphic abstract
The effect of hydrogen isotope on tensile and fracture properties was investigated for the Zr–2.5Nb pressure tube (PT) material charged with hydrogen between 30 and 200 wppm and in the temperature range of 25 and 300 °C and compared with the corresponding values determined for the Zr–2.5Nb PT material charged with deuterium. It was observed that for a given concentration up to 200 wppm, hydrogen and deuterium charged Zr–2.5Nb PT material have practically same tensile and fracture properties at all test temperatures between 25 and 300 °C indicating no effect of nature of hydrogen isotope on tensile and fracture properties of Zr–2.5Nb PT material.
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Notes
wppm reported throughout this manuscript is in the term of hydrogen equivalent (Heq.).
wppm(Heq.) = wppm(H) + wppm(D)/2.
References
Bind AK, Singh RN, Khandelwal HK, Sunil S, Chakravartty JK, Ghosh A, Dhandharia P, Bachawatand D, Vijayakumar S (2014) Fracture toughness evaluation of Zr-2.5Nb pressure tubes manufactured employing double forging for PHWR700. Mater Perform Charact 3(3):322–341
Bind AK, Singh RN, Khandelwal HK, Sunil S, Avinash G, Chakravartty JK, Ståhle P (2015) Influence of loading rate and hydrogen content on fracture toughness of Zr-2.5Nb pressure tube material. J Nucl Mater 465(2015):177–188
Bind AK, Sunil S, Singh RN (2016a) Effect of hydrogen isotope content on tensile flow behavior of Zr-2.5Nb pressure tube material between 25 and 300 °C. J Nucl Mater 476(2016):5–12
Bind AK, Sunil S, Singh RN, Chakravartty JK (2016b) Effect of error in crack length measurement on maximum load fracture toughness of Zr-2.5Nb pressure tube material. BARC report no. BARC/2016/E/002
Bind AK, Singh RN, Sunil S, Chattopadhyay J (2017) Effect of deuterium content on fracture toughness of Zr-2.5Nb pressure tube material in the temperature range of ambient to 300°C. J. Nucl. Mater. 496:182–192
Coleman CE, Cheadle BA, Cann CD, Theaker JR (1996) Development of pressure tubes with service life greater than 30 years. ASTM STP 1295:884–898
Davies PH, Sterns CP (1986) Fracture toughness testing of zircaloy-2 pressure tube material with radial hydrides using direct-current potential drop. ASTM STP 905:379–400
Dietz W (1994) Structural materials. In: Cahn RW, Haasen P, Kramer EJ (eds) Materials science and technology: a comprehensive treatment, 10B nuclear materials. VCH, Weinheim, pp 56–172
Dubey JS, Wadekar SL, Singh RN, Sinha TK, Chakravartty JK (1999) Assessment of hydrogen embrittlement of Zircaloy-2 pressure tubes using unloading compliance and load normalization techniques for determining J-R curves. J Nucl Mater 264:20–28
Elmoselhi MB, Warr BD, McIntyre S (1994) A study of hydrogen uptake mechanism in zirconium alloys. ASTM STP 1245:62–79
Honda SI (1984) Fracture toughness of Zr-2.5 wt% Nb pressure tubes. Nucl Eng Des 81:159–167
Huang FH (1993) Fracture toughness evaluation for zircaloy-2 pressure tubes with the electric-potential method. ASTM STP 1204:182–198
Khandelwal H, Singh RN, Bind AK, Sunil S, Chakravartty J (2014) Comparative study of basic test and resistance curve methods for fracture toughness evaluation of heat-treated Zr-2.5Nb alloy. Mater Perform Charact 3(3):21–44
Khandelwal HK, Singh RN, Bind AK, Sunil S, Chakravartty JK, Ghosh A, Dhandharia P, Bhachawat D, Shekhar R, Kumar SJ (2015) Tensile properties and fracture toughness of Zr–2.5Nb alloy pressure tubes of IPHWR220. Nucl Eng Des 293:138–149
Lemaignan C, Motta AT (1994) Structural materials. In: Cahn RW, Haasen P, Kramer EJ (eds) Materials science and technology: a comprehensive treatment, 10B nuclear materials. VCH, Weinheim, pp 1–51
Northwood DO, Kosasih U (1983) Hydrides and delayed hydrogen cracking in zirconium and its alloys. Int Met Rev 28(2):92–121
Pan ZL, Ritchie IG, Puls MP (1996) The terminal solid solubility of hydrogen and deuterium in Zr-2.5Nb alloys. J. Nucl. Mater. 228(2):227–237
Sawatzky A (1964) The effect of neutron irradiation on the mechanical properties of hydrided zirconium alloys. Atomic Energy Can. Ltd. Report no. AECL-1986.
Sharma RK, Sunil S, Kumawat BK, Singh RN, Tewari A, Kashyap BP (2017) Influence of hydride orientation on fracture toughness of CWSR Zr-2.5%Nb pressure tube material between RT and 300 °C. J. Nucl. Mater. 488:231–244
Sharma RK, Bind AK, Avinash G, Singh RN, Tewari A, Kashyap BP (2018) Effect of radial hydride fraction on fracture toughness of CWSR Zr-2.5%Nb pressure tube material between ambient and 300 °C temperatures. J. Nucl. Mater. 508:546–555
Simpson LA (1981) Criteria for fracture initiation at hydrides in zirconium-25 pct niobium alloy. Mater Trans A 12:2113–2124
Simpson LA, Cann CD (1979) Fracture toughness of zirconium hydride and its influence on the crack resistance of zirconium alloys. J Nucl Mater 87(2–3):303–316
Singh RN, Mukherjee S, Gupta A, Banerjee S (2005) Terminal solid solubility of hydrogen in Zr-alloy pressure tube materials. J. Alloys Compd. 389(1–2):102–112
Singh RN, Ståhle P, Massih AR, Shmakov AA (2007) Temperature dependence of misfit strains of δ-hydrides of zirconium. J Alloy Compd 436:150–154
Singh RN, Viswanathan UK, Sunil-Kumar PM, Satheesh S, Stahle P et al (2011) Influence of hydrogen content on impact toughness of Zr–2.5Nb pressure tube alloy. Nucl Eng Des 241(7):2425–2436
Singh RN, Bind AK, Srinivasan NS, Ståhle P (2013a) Influence of hydrogen content on fracture toughness of CWSR Zr–2.5Nb pressure tube alloy. J. Nucl. Mater. 432(1–3):87–93
Singh RN, Khandelwal HK, Bind AK, Sunil S, Ståhle P (2013b) Influence of stress field of expanding and contracting plate shaped precipitate on hydride embrittlement of Zr-alloys. Mater Sci Eng A 579:157–163
Singh RN, Bind AK, Khandelwal HK, Rath BN, Sunil S, Ståhle P, Chakravartty JK (2015) Effect of direction of approach of test temperature on fracture toughness of Zr–2.5Nb pressure tube material. Mater Sci Eng A 621:190–197
Standard test methods for tension testing of metallic materials—designation: ASTM E8-15
Standard test methods for elevated temperature tension tests of metallic materials—designation: ASTM E21-17.
Standard test method for measurement of fracture toughness—designation: ASTM E1820-15.
Urbanic VF, Warr BD, Manolescu A, Chow CK, Shanahan MW (1989) Oxidation and deuterium uptake of Zr-2.5Nb pressure tubes in CANDU-PHW reactors. ASTM STP 1023:20–34
Viswanathan UK, Singh RN, Basak CB, Anantharaman S, Sahoo KC (2006) Evaluation of effect of hydrogen on toughness of Zircaloy-2 by instrumented drop weight impact testing. J Nucl Mater 350(3):310–319
Yamanaka S, Yoshioka K, Uno M, Katsura M, Anada H, Matsuda T, Kobayashi S (1999a) Isotope effects on the physicochemical properties of zirconium hydride. J Alloys Compd 293–295:908–914
Yamanaka K, Yoshioka M, Uno M, Katsura H, Anada T, Matsuda S (1999b) Kobayashic, thermal and mechanical properties of zirconium hydride. J Alloys Compd 293–295:23–29
Yamanakaa S, Yamadaa K, Kurosakia K, Unoa M, Takedab K, Anada H, Matsuda T, Kobayashi S (2002) Characteristics of zirconium hydride and deuteride. J Alloys Compd 330–332:99–104
Acknowledgement
Authors are grateful to Dr. S. Banerjee and Dr. R. K. Sinha, former Secretaries, Department of Atomic Energy for constant encouragement and Dr. G. K. Dey, former Director, Materials Group, BARC and Dr. Madangopal Krishnan, Director, Materials Group for their constant support and encouragement. Authors acknowledge Mr. S. Vijayakumar, former Associate Director (T), Engineering Directorate, NPCIL, for providing the material for this study. Technical assistance provided by Shri K. C. Mazumdar, Shri Bhupendra K. Kumawat and Shri Sandeep A. Chandanshive of MMD in carrying out various experiments are thankfully acknowledged.
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AKB: Experimental work and draft manuscript preparation. RNS: Supervision, Discussion of the results and Reviewing and Editing of the manuscript.
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Bind, A.K., Singh, R.N. Effect of hydrogen isotopes on tensile and fracture properties of Zr–2.5Nb pressure tube material. Int J Fract 227, 193–204 (2021). https://doi.org/10.1007/s10704-020-00506-7
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DOI: https://doi.org/10.1007/s10704-020-00506-7