Konys, Jürgen

Schroer, Carsten

Skrypnik, Aleksandr

Wedemeyer, Olaf

Yurechko-Hussy, Mariya

English

KITopen

INSTITUTE FOR  APPLIED MATERIALS  APPLIED MATERIAL PHYSICS | CORROSION DEPARTMENTwww.kit.eduKIT – The Research University in the Helmholtz AssociationCreep Behavior of Austenitic Steel 316L in Low Oxygen-Containing Pb-Bi Eutectic at 450-550°CMariya Yurechko-Hussy, Carsten Schroer, Aleksandr Skrypnik, Olaf Wedemeyer and Juergen KonysPaper Number: ICONE25-677182 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentAustenitic 316L steelin nuclear power plants3 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentCRISLA-capsule for HLMCRISLA Facility:• 5 capsules for HLM• 3 capsules for air (gas)Conditions: Stagnant Pb or LBE (900 ml) Tmax = 650°C =  = 10–13 mass%Creep-rupture tests in oxygen-controlled heavy liquid metalContinuous control of oxygen concentration in HLM• Oxygen activity close to the specimen with air/Pt O2-sensor• -probes in gas -inlet and -outlet• Automatic introducing of gas with variable pO2 (Ar, Ar/H2and synthetic air)CRISLA-capsule forliquid metalDisplacementtransducerPull rodwith bellowsThermo-couplePot/Heatingelements-probePosition ofO2-sensor4 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentAugerSEMCr Fe MoNiTested material: austenitic 316L steelLamellae texture enriched in Cr, sligtly in Mo and depleted in Fe, Ni in comparisonwith the average composition of 316L316LFe Cr Ni Mo Mn Si Cu V W Al Ti C N P Sbal 16.73 9.97 2.05 1.81 .67 .23 .07 .02 .0183 .0058 .019 .029 .032 .003550 mLammelasOM unetched-Ferrite5 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentTests on 316L austenitic steelExperiments StatusLBE, co = 10–7–10–10 mass%,550 °C/ 300 MPatR =1,060 hLBE, co = 10–6 mass%,550 °C/ 300 MPatR = 182 h, 231 h, 365 hAir, 550 °C/ 300 MPa Stopped before rupture, tR > 1,150 hLBE, co = 10–8–10–9 mass%,500 °C/ 325 MPatR =5,025 hAir: 500 °C / 325 MPa Test still running,tR > 9,015 hLBE, co = 10–8–10–9 mass%,450 °C/ 375 MPaTest still running,tR > 3,795 hAir, 450 °C/ 375 MPa Test still running,tR > 2,425 h6 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentCreep-to-rupture in LBE at 450-550°C7 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion Departments=3.19×10-2(%×h-1)s=1.38×10-2(%×h-1)s=1.64×10-3(%×h-1)s=1.7×10-3(%×h-1)Creep-to-rupture at 550°C and 300 MPa8 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion Department0 1.000 2.000 3.000 4.000 5.000 6.000 7.000 8.00001020Air500°CLBEco=10-6-10-9 mass% Time (h)Strain (%)Creep-to-rupture at 500°C and 325 MPas=2.4×10-5(%×h-1)s=3.1×10-4(%×h-1)9 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion Department0 1.000 2.000 3.000 4.000 5.000-101AirLBEco= 10-9-10-10 mass%450°CTime (h)Strain (%)Creep(-to-rupture) at 450°C and 375 MPas=1.1×10-6(%×h-1)s=3.5×10-5(%×h-1)10 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentStructural study of 316L tested in LBESteelCorrosion(FeaCrb)2O3(Fe,Cr)O(FexCry) 2O3SteelPb-Bi in FerriteLBEOxides500 mSteel,no ferritezoneTypical image of thesurface with a ferrite zoneCorrosion extendinginwardly the steel withoutferrite zone (exception)500 mSteelFerriteNoferrite11 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentStructural study of 316L tested in LBESteelPb-Bi in FerriteLBEOxidesTypical image of thesurface with a ferrite zone500 mSteelFerriteNoferriteOxides at steel/ferrite interface(exception) and in the ferritezoneSteelPb-Bi in Ferrite(FeaCrb)2O3(FexCry) 2O312 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentCracks in ferrite zone filled with Pb-BiStructural study of 316L tested in LBE at 550°CSteelFerriteResinCracks filled with Pb-BiPit-type corrosion damages as a result ofselective leaching of the steel elements[V.Tsisar, C.Schroer, KIT]FerriteSteelPb-BiResin13 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentStructural study of 316L tested in LBEFerriteFerriteFerriteFerrite550°C500°C550°C 1,060h182 h5,025 hCrakcsCrakcsCrakcsPulledgroovesFerriteAusteniteCrakcsco =10-7-10-10 mass%10-6 mass%10-8-10-9 mass%Ductile-dimple rupture mode at RT in air [Structural Alloys forPower Plants, ed. by A. Shirzadi& S. Jackso , 2014]14 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion DepartmentStructural study of 316L tested in LBE• Strain at rupture at 500-550°C in LBE is significantly less than at RT. Reduction ofarea increases in LBE with lowering of T. But ductile-dimple rupture mode ofaustenitic 316L steel is remains in LBE at 500-550°C.• Ferrite zone at lower T, co and longer tR is more regular distributed and it is thickerthan at co=10-6 mass% (at 550°C)T / °C Enviroment Co, mass% / tR, h Strain / % Reduction ofarea / %Thickness offerrite / m550LBE10-6 / 23114-22 320-8610-6 / 365 0-3710-7-10-10 / 1,059 0-326air1 1,025 3 10 -500LBE 10-8-10-9 / 5,025 12 43 93-200air2 after 7,729 0.4 - -1 - stopped; 2 - runningRT air 50-70 Comprehensive NuclearMaterials, ed. by J. Konings, 201215 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion Department316L tested in LBEConclusion:• 316L austenitic steel degrades stronger in LBE than in air at 500 and 550°C due to selective leaching of the steel elements leading to :(i) austenite-to-ferrite transformation at steel/liquid metal interface and(ii) penetration of liquid metal into ferrite and cracks formed into the ferrite andpropagated further into the steel• co=10-6 mass% (at 550°C) does not decrease LBE effect in comparison tolower co.Acknowledgment:The autors are very thankfull to Int. Project MatISSE, 7th Grant Agreement No. 604862. Special thaks are going to PhD V. Tsisar for fruitful discussions andproviding the results for corrosion of 316L in flowing LBE in CORRIDA loop.16 06.07.2017 25th International Conference on Nuclear Engineering (ICONE25) Institute for Applied Materials –July 02–06, 2017 Applied Materials Physics (IAM-AWP)Shanghai, China Corrosion Department400500600AirLiquid metal probeActivationstageLiquid metalLiquid metal Temperature (°C)-0,50,00,51,0 Oxygen sensoroutput (V)020406080100120140Ar-H2Ar 6.0Ar-H2Ar 6.0 Volume flow(Nccm/min)0 100 200 300 400 50010-810-610-410-2 Time (h)Concentration ofsolved oxygen (mass%)Functionality check of Pt/O-sensor200 300 400 500-20-1001020 Time (h) (U – EPb/PbO) (mV)0 100 200 300 400 5000,60,70,80,91,01,1 Time (h)Oxygen sensor output (V)EPb/PbOPt/O-Sensor after creep-to-rupture testwith 316L in LBE at 550°C, co=10-6 mass%, tR=365 h

Creep behavior of austenitic steel 316L in low oxygen-containing Pb-Bi eutectic at 450-550⁰C

https://publikationen.bibliothek.kit.edu/1000071664/4232781

Creep behavior of austenitic steel 316L in low oxygen-containing Pb-Bi eutectic at 450-550⁰C

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