joint hydrogen susceptibility of 304 ss welded with titanium eva mazancovÁ 1, dimitrij ostroushko...
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JOINT HYDROGEN JOINT HYDROGEN SUSCEPTIBILITY OF 304 SS SUSCEPTIBILITY OF 304 SS WELDED WITH TITANIUM WELDED WITH TITANIUM
EVA MAZANCOVÁ1, DIMITRIJ OSTROUSHKO1,KAREL SAKSL2, ADAM NIESLONY3
1VŠB-TU of Ostrava Faculty of Metallurgy and Materials Engineering
Czech Republic
2Institute of Material Research of SAS, Košice, Slovak Republic
3Opole University of Technology, Faculty of mechanical Engineering, Opole, Poland
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AIMAIM
TTo show H2 response of 304 SS and Ti weld in conditions
of fatigue test (tensile-pressure) and of the HIC
exposition
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EXPERIMENTAL MATERIAL EXPERIMENTAL MATERIAL
Sheets (110+6Ti) x 2600 x 2600 Sheets (110+6Ti) x 2600 x 2600 mmmm
welded by Explomet-Opole welded by Explomet-Opole
304 SS304 SS (wt. %)(wt. %)
0.03C-0.45Si-1.96Mn-18.4Cr-9.7Ni-0.03C-0.45Si-1.96Mn-18.4Cr-9.7Ni-
0.006P-0.011S0.006P-0.011S
Ti Ti (wt. %)(wt. %)
0.01C-0.05Fe-0,05O-0,005N-0.01C-0.05Fe-0,05O-0,005N-0.006H0.006H
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EXPERIMENTAL PROCEDUREEXPERIMENTAL PROCEDURE
Fatigue bar Fatigue bar 90x90x10 mm 10 mm
(0.1M (0.1M H2SO4 solut./8 h–current density of 15 solut./8 h–current density of 15 mA.cm-
2))
Cyclic fatigue stress (tensile-pressure) Cyclic fatigue stress (tensile-pressure) at amplitude of 20 Hz (40 Hz HT at amplitude of 20 Hz (40 Hz HT without Hwithout H2) - ) - ČSN 42 0363
as-received stateas-received state 600°C/1.5h 600°C/1.5h (HT)(HT)after after H-
charging charging
Weld
Ti
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EXPERIMENTAL PROCEDUREEXPERIMENTAL PROCEDURE
HIC – NACE St. TM0284-2011 HIC – NACE St. TM0284-2011
Samples 20 x 14.5 x 100 mmSamples 20 x 14.5 x 100 mm
Crack length ratio CLRCrack length ratio CLR
Crack thickness ratio CTRCrack thickness ratio CTR
Crack sensitivity ratio CSRCrack sensitivity ratio CSR
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HIC SAMLES + EVALUATIONHIC SAMLES + EVALUATION
CLR =CLR = 100.a/w (%)
CTR =CTR = 100.b/T (%) (%)
CSR =CSR = 100.(a.b)/w.T (%)
Interface analysis using EDAX andInterface analysis using EDAX and
Synchrotron Synchrotron
Ti 304 SS a = crack length in w b = crack thickness in T
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MICROSTRUCTURE MICROSTRUCTURE BIMETAL INTERFACEBIMETAL INTERFACE
Ti
304 SS
a b
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MICROGRAPH - ADIABATIC MICROGRAPH - ADIABATIC BANDSBANDS
Ti
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MICROGRAPHS – 3 mm AWAYMICROGRAPHS – 3 mm AWAYBONDING LINEBONDING LINE
a b
304 SS
Ti
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HIC EVALUATIONHIC EVALUATION individual values (%) individual values (%)
S CLR S CLR (15%)(15%) CTR CTR (5%)(5%) CSR CSR (2%) (2%) 0HT0HT//HTHT 0HT0HT//HT 0HTHT 0HT//HTHT11.04/2.19 2.47/0.14 0.003/0.001 21.25/1.37 2.25/0.13 0.01/0.00232.04/3.08 1.99/0.62 0.01/0.003 4 3.07/3.68 2.17/0.70 0.01/0.002 53.42/0.50 2.93/0.04 0.01/0.0016 4.15/2.37 3.75/0.16 0.01/0.00272.25/1.80 2.30/3.66 0.01/0.012 81.92/1.60 1.90/2.80 0.01/0.00593.02/1.60 2.51/2.62 0.01/0.013
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HIC EVALUATIONHIC EVALUATIONmean values (%)mean values (%)
S CLR CTR CSR S CLR CTR CSR 11.44/2.21 2.47/0.30 0.01/0.002 23 4 3.55/1.52 2.95/0.30 0.01/0.002 56 72.39/1.67 2.24/3.00 0.01/0.01 89
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HIC EVALUATIONHIC EVALUATIONa
total cracks: total cracks: 84 (without the HT)84 (without the HT) 56 (after the HT)56 (after the HT)
length: length: 0.01-0.08 mm 0.01-0.08 mm thickness: thickness: 0.01-0.22 mm0.01-0.22 mm
ab
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INTERPHASE ANALYSESINTERPHASE ANALYSES
33
22
4411
11-304 SS-304 SS22-68-98Ti -68-98Ti
33-16Ti-16Cr--16Ti-16Cr-57Fe-8Ni + 57Fe-8Ni + Al,Si,Mn bal.Al,Si,Mn bal.55-65-90Ti -65-90Ti
4-4-20Ti-11Cr-20Ti-11Cr-61Fe-6Ni +61Fe-6Ni +Al, Si, Mn bal.Al, Si, Mn bal.
a
b
55
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FATIGUE TESTSFATIGUE TESTS EPNM2014-Kraków
FRACTURE SURFACE ANALYSIS FRACTURE SURFACE ANALYSIS
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FRACTURE SURFACE ANALYSIS FRACTURE SURFACE ANALYSIS
2b
3b
1b
WHT WHT (without(without the HT)the HT) ++ H-charging H-charging
AHT AHT (after the (after the HT)HT) + + H-ChargingH-Charging
a
b
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Mark Si Ti Cr Mn Fe Ni
1a1a 0.6 19.2 16.7 1.5 54.9 7.1
1b1b 0.9 19.7 16.7 1.6 54.1 7.0
1c1c 0.9 21.1 16.2 1.5 53.0 7.3
2a 97.1 0.5 2.0 0.4
2b 0.2 65.5 4.9 0.6 24.3 4.5
3a3a 0.6 45.3 11.3 1.1 36.9 4.8
3b3b 0.6 42.2 11.2 1.1 40.3 4.6
FRACTURE SURFACE ANALYSES (at.%)FRACTURE SURFACE ANALYSES (at.%)
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INTERPHASE ANALYSISINTERPHASE ANALYSISUSING SYNCHROTRONUSING SYNCHROTRON
Raster step size = 1m, total length = 401 mX-ray focused to 2.2x34 m, beamline P07 at Petra III (electron storage ring
operating at energy of 6 GeV with beam current 100 mA (18)
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CONCLUSIONSCONCLUSIONS
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.
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CONCLUSIONSCONCLUSIONS
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.
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CONCLUSIONSCONCLUSIONS
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.
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ACKNOWLEDGMENTACKNOWLEDGMENT
This paper was created within the project 7AMB14SK023“MobilitiesMobilities“, 02613/2013/RRC „International Research TeamsInternational Research Teams“ sponsored by
Northern Moravian region, within the project SP 2014/62 “Specific Research in Specific Research in
Metallurgical, Material and Process EngineeringMetallurgical, Material and Process Engineering“ and No. L01203 L “Regional Materials Science Regional Materials Science
and Technology Centre – Feasibility Programand Technology Centre – Feasibility Program“ founded by Ministry of Education, Young
and Sports of Czech Republic. Special thanks belongs to EXPLOMET EXPLOMET for an
important cooperation.
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THANKS FOR THANKS FOR YOUR YOUR
ATTENTIONATTENTION
Slovak Academy of Sciences
Institute of Material Research
Kosice, Slovakia
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