Cathodic hydrogen charging of Inconel 718

Niklas Ehrlin; Christina Bjerkén; Martin Fisk; Niklas Ehrlin; Christina Bjerkén; Martin Fisk

doi:10.3934/matersci.2016.4.1350

AIMS Materials Science

2016, Volume 3, Issue 4: 1350-1364. doi: 10.3934/matersci.2016.4.1350

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Research article

Cathodic hydrogen charging of Inconel 718

Materials Science and Applied Mathematics, Malmö University, Sweden

Received: 11 April 2016 Accepted: 08 October 2016 Published: 13 October 2016

The nickel based superalloy IN718 is known to be prone to hydrogen sensitivity, causing degradation of its mechanical properties. Therefore, during mechanical testing of hydrogen charged samples, a well-defined hydrogen distribution is essential to better understand the influence of hydrogen on dislocation movement and plasticity behavior. The possibility of charging cylindrical specimens of IN718 with hydrogen using cathodic charging is investigated. The method is based on an electro-chemical process using a molten salt electrolyte. The resulting hydrogen concentration is measured for various radii, and it is shown that the anisotropic diffusion coefficient resulting from electromigration, inherent in the charging method, must be taken into account as it has a major impact on the charging parameters of IN718. Also, no evidence of degassing during storage is found. Further, changes in surface roughness were examined by SEM, and only limited surface degradation is observed, which is not considered to significantly affect the results.
- nickelbased superalloys,
- cathodic hydrogen charging,
- hydrogen concentration profile,
- hydrogen diffusion,
- electromigration
Citation: Niklas Ehrlin, Christina Bjerkén, Martin Fisk. Cathodic hydrogen charging of Inconel 718[J]. AIMS Materials Science, 2016, 3(4): 1350-1364. doi: 10.3934/matersci.2016.4.1350

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Abstract

The nickel based superalloy IN718 is known to be prone to hydrogen sensitivity, causing degradation of its mechanical properties. Therefore, during mechanical testing of hydrogen charged samples, a well-defined hydrogen distribution is essential to better understand the influence of hydrogen on dislocation movement and plasticity behavior. The possibility of charging cylindrical specimens of IN718 with hydrogen using cathodic charging is investigated. The method is based on an electro-chemical process using a molten salt electrolyte. The resulting hydrogen concentration is measured for various radii, and it is shown that the anisotropic diffusion coefficient resulting from electromigration, inherent in the charging method, must be taken into account as it has a major impact on the charging parameters of IN718. Also, no evidence of degassing during storage is found. Further, changes in surface roughness were examined by SEM, and only limited surface degradation is observed, which is not considered to significantly affect the results.

References

[1]	Slama C, Abdellaoui M (2000) Structural characterization of the aged Inconel 718. J Alloy Compd 306: 277–284. doi: 10.1016/S0925-8388(00)00789-1
[2]	Reed RC. 2. The Physical Metallurgy of Nickel and its Alloys, In: Superalloys - Fundamentals and Applications: Cambridge University Press.
[3]	Liu L, Tanaka K, Hirose A, et al. (2002) Effects of precipitation phases on the hydrogen embrittlement sensitivity of Inconel 718. Sci Technol Adv Mater 3: 335. doi: 10.1016/S1468-6996(02)00039-6
[4]	Hirose A, Arita Y, Nakanishi Y, et al. (1996) Decrease in hydrogen embrittlement sensitivity of INCONEL 718 by laser surface softening. Mater Sci Eng A 219: 71–79. doi: 10.1016/S0921-5093(96)10384-1
[5]	Sjöberg G, Cornu D (2001) Hydrogen Embrittlement of Cast Alloy 718 - Effects of Homogenization, Grain Size and delta-phase, 679–690.
[6]	Hicks PD, Altstetter CJ (1992) Hydrogen-enhanced cracking of superalloys. Metall T A 23: 237–249. doi: 10.1007/BF02660868
[7]	Hicks PD, Altstetter CJ (1990) Internal hydrogen effects on tensile properties of Iron- and Nickel-base superalloys. Metall T A 21A: 365.
[8]	Senor DJ, Peddicord KL, Strizak JP (1991) Effects of hydrogen on the fracture morphology of Inconel 718. Mater Lett 11: 373–378. doi: 10.1016/0167-577X(91)90137-U
[9]	Birnbaum HK (1989) Mechanisms of hydrogen-related fracture of metals. Office of Naval Research USN 00014-83-K-0468.
[10]	Dadfarnia M, Martin ML, Nagao A, et al. (2015) Modeling hydrogen transport by dislocations. J Mech Phys Solids 78: 511–525. doi: 10.1016/j.jmps.2015.03.002
[11]	Pound BG (1990) Hydrogen trapping in precipitation-hardened alloys. Acta Metall et Mater 38: 2373–2381. doi: 10.1016/0956-7151(90)90250-K
[12]	Milella P (2013) Hydrogen Embrittlement and Sensitization Cracking, In: Anonymous Fatigue and Corrosion in Metals: Springer Milan, 689–729.
[13]	Au M (2007) High temperature electrochemical charging of hydrogen and its application in hydrogen embrittlement research. Mater Sci Eng A 454–455: 564–569.
[14]	Liu L, Zhai C, Lu C, et al. (2005) Study of the effect of delta phase on hydrogen embrittlement of Inconel 718 by notch tensile tests. Corros Sci 47: 355–367. doi: 10.1016/j.corsci.2004.06.008
[15]	Fournier L, Delafosse D, Magnin T (1999) Cathodic hydrogen embrittlement in alloy 718. Mater Sci Eng A 269: 111–119. doi: 10.1016/S0921-5093(99)00167-7
[16]	Oriani RA (1993) The physical and metallurgical aspects of hydrogen in metals. ICCF4 Fourth International Conference on Cold Fusion.
[17]	Beloglazov SM (2003) Peculiarity of hydrogen distribution in steel by cathodic charging. J Alloy Compd 356–357: 240–243.
[18]	Kimura A, Birnbaum HK (1987) The effects of cathodically charged hydrogen on the flow stress of nickel and nickel-carbon alloys. Acta Metall 35: 1077–1088. doi: 10.1016/0001-6160(87)90055-1
[19]	Panagopoulos CN, Georgiou EP, Chaliampalias D (2014) Cathodic hydrogen charging of zinc. Corros Sci 79: 16–20. doi: 10.1016/j.corsci.2013.10.016
[20]	Ulmer DG, Altstetter CJ (1987) Hydrogen concentration gradients in cathodically charged austenitic stainless steel. J Mater Res 2: 305–312. doi: 10.1557/JMR.1987.0305
[21]	Birnbaum HK, Sofronis P (1994) Hydrogen-enhanced localized plasticity—a mechanism for hydrogen-related fracture. Mater Sc Eng A 176: 191–202. doi: 10.1016/0921-5093(94)90975-X
[22]	Raizman A, Barak J, Zamir D, et al. (1983) NMR study of hydrogen in cathodically charged Inconel 718. J Nucl Mater 119: 73–77. doi: 10.1016/0022-3115(83)90054-5
[23]	Delafosse D, Magnin T (2001) Hydrogen induced plasticity in stress corrosion cracking of engineering systems. Eng Fract Mech 68: 693–729. doi: 10.1016/S0013-7944(00)00121-1
[24]	Hamma H, Rasmussen SB, Rogez J, et al. (2006) Conductivity, calorimetry and phase diagram of the NaHSO4–KHSO4 system. Thermochim Acta 440: 200–204. doi: 10.1016/j.tca.2005.11.022
[25]	Xu J, Sun XK, Liu QQ, et al. (1994) Hydrogen Permeation Behavior in IN718 and GH761 Superalloys 25A: 539–544.
[26]	Jebaraj JJM, Morrison DJ, Suni II. (2014) Hydrogen diffusion coefficients through Inconel 718 in different metallurgical conditions. Corros Sci 80: 517–522. doi: 10.1016/j.corsci.2013.11.002
[27]	Turnbull A, Ballinger RG, Hwang IS, et al. (1992) Hydrogen Transport in Nickel-Base Alloys 23A: 3231–3244.
[28]	G A, C B. (1998) Surfaces, Oxford Chemistry Primer 59 Eds., Oxford: Oxford University Press.
[29]	Kupka M, Stępień K, Nowak K (2014) Studies on hydrogen diffusivity in iron aluminides using the Devanathan–Stachurski method. J Phys Chem Solids 75: 344–350. doi: 10.1016/j.jpcs.2013.10.009
[30]	ASTM (2011) Standard Practice for Evaluation of Hydrogen Uptake, Permeation, Transport in Metals by an Electrochemical Technique G148-97.
[31]	Liu L, Tanaka K, Hirose A, et al. (2003) Experimental and numerical analyses of the mechanism for decreasing hydrogen-embrittlement sensitivity of aged Inconel 718 by laser surface annealing. J Laser Appl 15: 134–144. doi: 10.2351/1.1585080
[32]	Chao B, Chae S, Zhang X, et al. (2007) Investigation of diffusion and electromigration parameters for Cu–Sn intermetallic compounds in Pb-free solders using simulated annealing. Acta Mater 55: 2805–2814. doi: 10.1016/j.actamat.2006.12.019
[33]	Basak D, Overfelt RA, Wang D (2003) Measurement of Specific Heat Capacity and Electrical Resistivity of Industrial Alloys Using Pulse Heating Techniques. Int J Thermophys 24: 1721–1733. doi: 10.1023/B:IJOT.0000004101.88449.86
[34]	Brouwer RC, Griessen R (1989) Electromigration of hydrogen in alloys: Evidence of unscreened proton behavior. Phys Rev Lett 62: 1760–1763. doi: 10.1103/PhysRevLett.62.1760
[35]	Ho PS, Watson TS (1989) Electromigration in metals. Rep Prog Phys 52: 301–348. doi: 10.1088/0034-4885/52/3/002
[36]	van Ek J, Lodder A (1994) Electromigration of hydrogen in metals: Theory and experiment. Defect and Diffus Forum 115–116: 1–38.
[37]	Guyer JE, Wheeler D, Warren JA (2009) FiPy: Partial Differential Equations with Python. Comput Sci Eng 11: 6–15.
[38]	Gray HR (1974) Embrittlement of Nickel-, Cobalt-, and Ironbase Superalloys by Exposure to Hydrogen TND-7805.
[39]	He J, Fukuyama S, Yokogawa K, et al. (1994) Effect of Hydrogen on Deformation Structure of Inconel 718. Mater T JIM 35: 689–694. doi: 10.2320/matertrans1989.35.689
[40]	Dong J, Zhang M, Xie X, et al. (2002) Interfacial segregation and cosegregation behaviour in a nickel-base alloy 718. Mater Sci Eng A 328: 8–13. doi: 10.1016/S0921-5093(01)01491-5
[41]	Hicks PD (1990) Hydrogen embrittlement of selected nickel and iron-base superalloys. ProQuest Dissertations and Theses.

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