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JOINT HYDROGEN SUSCEPTIBILITY OF 304 SS WELDED WITH TITANIUM

EPNM2014-Kraków. JOINT HYDROGEN SUSCEPTIBILITY OF 304 SS WELDED WITH TITANIUM. Eva MAZANCOVÁ 1 , Dimitrij Ostroushko 1 , Karel Saksl 2 , Adam Nieslony 3 1 VŠB-TU of Ostrava Faculty of Metallurgy and Materials Engineering Czech Republic

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JOINT HYDROGEN SUSCEPTIBILITY OF 304 SS WELDED WITH TITANIUM

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  1. EPNM2014-Kraków JOINT HYDROGEN SUSCEPTIBILITY OF 304 SS WELDED WITH TITANIUM Eva MAZANCOVÁ1, Dimitrij Ostroushko1, Karel Saksl2, Adam Nieslony3 1VŠB-TU of Ostrava FacultyofMetallurgy and MaterialsEngineering Czech Republic 2Institute ofMaterialResearchof SAS, Košice, Slovak Republic 3Opole University of Technology, FacultyofmechanicalEngineering, Opole, Poland

  2. EPNM2014-Kraków AIM To show H2response of 304 SS and Ti weld in conditionsoffatigue test (tensile-pressure) and oftheHIC exposition

  3. EPNM2014-Kraków EXPERIMENTAL MATERIAL Sheets (110+6Ti) x 2600 x 2600 mm welded by Explomet-Opole 304 SS(wt. %) 0.03C-0.45Si-1.96Mn-18.4Cr-9.7Ni- 0.006P-0.011S Ti (wt. %) 0.01C-0.05Fe-0,05O-0,005N-0.006H

  4. EPNM2014-Kraków EXPERIMENTAL PROCEDURE Weld Ti Fatigue bar 90x10 mm as-receivedstate (0.1M H2SO4solut./8 h–currentdensityof 15 mA.cm-2) Cyclicfatigue stress (tensile-pressure) atamplitudeof 20 Hz (40 Hz HT without H2) - ČSN 42 0363 600°C/1.5h (HT) afterH-charging

  5. EPNM2014-Kraków EXPERIMENTAL PROCEDURE HIC – NACE St. TM0284-2011 Samples 20 x 14.5 x 100 mm Cracklength ratio CLR Crackthickness ratio CTR Crack sensitivity ratio CSR

  6. HIC SAMLES + EVALUATION CLR =100.a/w (%) CTR =100.b/T (%) CSR =100.(a.b)/w.T (%) Interface analysisusing EDAX and Synchrotron EPNM2014-Kraków Ti 304 SS a = cracklength in w b = crackthickness in T

  7. EPNM2014-Kraków MICROSTRUCTURE BIMETAL INTERFACE b a 304 SS Ti

  8. EPNM2014-Kraków MICROGRAPH - ADIABATIC BANDS Ti

  9. EPNM2014-Kraków MICROGRAPHS – 3 mm AWAYBONDING LINE b a Ti 304 SS

  10. EPNM2014-Kraków HIC EVALUATIONindividualvalues (%) • S CLR (15%) CTR (5%) CSR (2%) • 0HT/HT0HT/HT 0HT/HT • 1.04/2.19 2.47/0.14 0.003/0.001 • 1.25/1.37 2.25/0.13 0.01/0.002 • 2.04/3.08 1.99/0.62 0.01/0.003 • 4 3.07/3.68 2.17/0.70 0.01/0.002 • 3.42/0.50 2.93/0.04 0.01/0.001 • 6 4.15/2.37 3.75/0.16 0.01/0.002 • 2.25/1.80 2.30/3.66 0.01/0.012 • 1.92/1.60 1.90/2.80 0.01/0.005 • 3.02/1.60 2.51/2.62 0.01/0.013

  11. EPNM2014-Kraków HIC EVALUATIONmeanvalues (%) • S CLR CTR CSR • 1.44/2.21 2.47/0.30 0.01/0.002 • 2 • 4 3.55/1.52 2.95/0.30 0.01/0.002 • 5 • 6 • 2.39/1.67 2.24/3.00 0.01/0.01 • 8 • 9

  12. EPNM2014-Kraków a HIC EVALUATION b a totalcracks: 84 (withoutthe HT) 56 (afterthe HT) length: 0.01-0.08 mm thickness: 0.01-0.22 mm

  13. EPNM2014-Kraków 3 2 1 4 INTERPHASE ANALYSES 1-304 SS 2-68-98Ti 3-16Ti-16Cr-57Fe-8Ni + Al,Si,Mn bal. 5-65-90Ti a 5 b 4-20Ti-11Cr-61Fe-6Ni + Al, Si, Mn bal.

  14. EPNM2014-Kraków FATIGUE TESTS

  15. EPNM2014-Kraków FRACTURE SURFACE ANALYSIS

  16. EPNM2014-Kraków 3b 2b 1b FRACTURE SURFACE ANALYSIS a WHT (without the HT) + H-charging b AHT (afterthe HT) + H-Charging

  17. EPNM2014-Kraków FRACTURE SURFACE ANALYSES (at.%)

  18. EPNM2014-Kraków INTERPHASE ANALYSISUSING SYNCHROTRON Raster step size = 1m,totallength = 401 m X-rayfocused to 2.2x34 m, beamline P07 at Petra III (electronstorage ring operatingatenergyof 6 GeVwithbeamcurrent 100 mA (18)

  19. EPNM2014-Kraków CONCLUSIONS Safe load boundary of the HT+H-charged bars (at 20Hz) showed 17% of tensile strength of bimetal weld in clad state and/or 12 % (at 40 Hz) in case of H-charged samples without the HT. Higher amplitude (40 Hz) resulted in threshold level decrease of the HT samples without H-charging approx. by 25 MPa. Fracture surfaces predominanty indicated the rupture in areas where 66–97 at. % of Ti was revealed representing bonding line. On surface, lower portion of Ti a presence of the FeTi and/or Fe2Ti with Cr partially substituting the Fe could indicate.

  20. EPNM2014-Kraków CONCLUSIONS After the HIC exposition cracks were observed in areas of curls only, where inter-metallic phases of the Fe2Ti were detected using monochromatic synchrotron radiation, while the EDAX analysis showed the most frequent mixed phases approx. (in at. %) with 20 Ti, 11 Cr, 60 Fe showed. All HIC parameters were satisfactory and complied with the requirements of NACE Standard and ANSI/API specification 5L. After the HT, results were more satisfactory in average.

  21. EPNM2014-Kraków CONCLUSIONS After the HIC exposition, more cracks were detected in samples without the HT unlike the HT ones. Cracks showed 45°-90° orientation towards the bonding line and none ran to any basic material. Cracks were maximally 0.08 mm long and 0.22 mm thick (2 cases). By application of monochromatic synchrotron radiation Fe2Ti phase in wave curls was revealed. Presence of Fe-fcc, Fe-bcc and Ti-hcp will be discussed in next paper.

  22. EPNM2014-Kraków ACKNOWLEDGMENT This paper was created within the project 7AMB14SK023“Mobilities“, 02613/2013/RRC „International ResearchTeams“ sponsored by NorthernMoravian region, withintheproject SP 2014/62 “SpecificResearch in Metallurgical, Material and ProcessEngineering“ and No. L01203 L “RegionalMaterials Science and Technology Centre – Feasibility Program“ founded by Ministry ofEducation, Young and Sportsof Czech Republic. Specialthanksbelongsto EXPLOMET foranimportantcooperation.

  23. EPNM2014-Kraków THANKS FOR YOUR ATTENTION Slovak Academy of Sciences Institute of Material Research Kosice, Slovakia

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