Große, M.

Stuckert, J.

Walter, M.

English

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Institute for Materials ResearchKIT – University of the State of Baden-Württemberg andNational Large-scale Research Center of the Helmholtz Association www.kit.eduMechanical properties of pre-hydrogenated (600 – 5000 wppm) cladding segmentsJ. Stuckert, M. Große, M. WalterIMF218.11.2010Objectives• Preparation of hydrogenated samples formechanical tests• Hydrogen uptake under hydrogen starvationconditions to achieve axial hydrogen gradient inthe cladding• Tension and ring compression tests withhydrogenated samplesJ. Stuckert: Hydrogenated samplesQWS 16, KarlsruheIMF318.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, KarlsruheNUREG-6967 (2008): unirradeated sample OCL11 ramped in steam from 300ºC to 1204ºCat 5ºC/s, held at 1204ºC for 300 s, cooled at 3ºC/s to 800ºC, and cooled from 800ºC to RTShort term secondary hydrogenation after ballooning and burst:hydrogen uptake increased rapidly up to 4000 ppm(significant higher than ductility limit of 500 ppm) sample OCL11 (Zircaloy-2):IMF418.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, Karlsruhevertical 3-zones tube furnace LORA(height 60 cm)sample extractionat furnace topsample15 cmsteel rodsampleflame(burning of H2)Hydrogenation facility H2 and Ar supplyIMF518.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, Karlsruhesample temperature H2 partial pressurehydrogenation durationdissolved hydrogen (weight gain)hydrogen solubility limit# ºC mbar min wppm wppmH11Z4 700 90 2 2473 16770H12Z4 700 90 6 5417 16770H13 Z4 700 37 2 681 10820H14 Z4 700 37 4 1819 10820H15 Z4 700 37 6 2746 10820H16 Z4 700 37 8 4810 10820H18 Z4 800 37 2 827 5150H19 Z4 800 37 4 1625 5150H20 Z4 800 37 8 2783 5150H21 Z4 800 37 16 4420 5150H29Z4 900 37 1 400 2770H31Z4 900 37 4 1215 2770H33Z4 900 37 8 1689 2770Test matrixIMF618.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, KarlsruheH14Z4: annealed at 700 °Cwith H2 (37 mbar); ∆t=240 s∆mH=1800 wppmH19Z4: annealed at 800 °Cwith H2 (37 mbar); ∆t=240 s∆mH=1600 wppmH33Z4: annealed at 900 °Cwith H2 (37 mbar); ∆t=480 s∆mH=1700 wppmPost-test sample appearance:sample bending at T<800°C due to phase transition α-Zr to β-ZrIMF718.11.2010010002000300040005000600070000 20 40 60 80 100 120 140Hydrogen content, wppmElevation, mm60 s @ 900°C240 s @ 900°C480 s @ 900°C480 s @ 700°CHydrogenation duration @ T:J. Stuckert: Hydrogenated samplesQWS 16, KarlsruheAxial distribution of hydrogen contentmeasured by neutron radiographyn0 M. Großen0 M. GroßeIMF818.11.201001002003004005006007008000 2 4 6 8 10 122800 wppm 1600 wppm 800 wppmdisplacement, mmEng. stress, MPa01002003004005006007008000 2 4 6 8 10 125400 wppm 4800 wppm 2700 wppm2500 wppm 1800 wppm 680 wppmdisplacement, mmEng. stress, MPaJ. Stuckert: Hydrogenated samplesQWS 16, KarlsruheTension tests with samples hydrogenated at 700 and 800°C:rupture with negligible contractionductile nothydrogenatedsamplewith pronouncedcontraction700°C: significant hydrogen gradient800°C: moderate hydrogen gradientweight gainweight gainIMF918.11.201001002003004005006007008009000 2 4 6 8 10 122800 wppm @ 800°C 1700 wppm @ 900°C1600 wppm @ 800°C 1200 wppm @ 900°C 800 wppm @ 800°C  400 wppm @ 900°Cdisplacement, mmEng. stress, MPaJ. Stuckert: Hydrogenated samplesQWS 16, KarlsruheTension tests with samples hydrogenated at 800°C (moderate H gradient) and 900°C (small gradient)ductile nothydrogenatedsamplewith pronouncedcontractionnegligiblecontractionIMF1018.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, Karlsruhe04008001200160020000 1 2 3 4 5 6 7 8 95400 wppm 4800 wppm 2700 wppm (top segment)2500 wppm 1800 wppm 680 wppmdisplacement, mmload, N04008001200160020000 1 2 3 4 5 6 7 8 92800 wppm 1600 wppm (top ring segment) 800 wppmdisplacement, mmload, NCompression tests with rings from bottom of sampleshydrogenated at 700 and 800°C700°C800°CIMF1118.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, KarlsruheCompression tests with rings from bottom of sampleshydrogenated at 700 and 900°C: hardening and embrittlement increase at higher annealing temperature0200400600800100012000 1 2 3 4 5 6 72500 wppm @ 700°C 1700 wppm @ 900°C 1800 wppm @ 700°C1200 wppm @ 900°C 681 wppm 700°C 400 wppm @ 900°Cdisplacement, mmload, NIMF1218.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, KarlsruheSummary• Twelve Zry-4 cladding specimens with length of150 mm were hydrogenated in Ar + H2 atmosphere attemperatures 700, 800 and 900°C• Average hydrogen content was measured withsample weighing between 600 and 5000 wppm. Axialhydrogen distribution was measured by neutronradiography.• No macroscopic hydrides were observed by means ofoptical microscopy.• Tension and ring compression tests showed clearhardening and embrittlement increase with increasedhydrogen content and annealing temperature.IMF1318.11.2010 J. Stuckert: Hydrogenated samplesQWS 16, KarlsruheThank you for your attention The authors would like to thank Ms Peters, Ms Baudin, Ms C. Goulet and Ms Wozniak

Mechanical properties of pre-hydrogenated (600 - 5000 wppm) cladding segments

https://publikationen.bibliothek.kit.edu/240081002/66183794

Mechanical properties of pre-hydrogenated (600 - 5000 wppm) cladding segments

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