Hydrogen embrittlement behavior of Inconel 718 alloy at room temperature

doi:10.1016/j.jmst.2018.10.002

Abstract

Abstract:

Hydrogen embrittlement of Inconel 718 alloy was investigated. Multi-scale observation technique were employed, comprising slow strain rate tensile tests, scanning electron microscopy and transmission electron microscopy analysis. The results demonstrate that hydrogen charging deteriorates mechanical properties of the alloy. Inconel 718 alloy shows partial Portevin-Le Chatelier (PLC) effect at room temperature when hydrogen charging current density is 220 mA cm^-2 and 590 mA cm^-2. Moreover, plastic deformation features with dislocation cells are detected in hydrogen-induced brittle zone. Thus, it is concluded that dragging effect of hydrogen atoms on dislocations contributes to PLC effect.

Key words: Embrittlement, Hydrogen in metals, Inconel 718 alloy, Portevin-Le Chatelier effect

Xinfeng Li, Jin Zhang, Eiji Akiyama, Qinqin Fu, Qizhen Li. Hydrogen embrittlement behavior of Inconel 718 alloy at room temperature[J]. J. Mater. Sci. Technol., 2019, 35(4): 499-502.

Figures/Tables 5

Fig. 1. Optical microstructure of Inconel 718 alloy in polarization mode.

Fig. 2. (a) Engineering stress-strain curves of hydrogen free and hydrogen charged samples; (b) High magnification image of red rectangle region in Fig. 2(a); Variation in the number of stress drops with stress drops (Δσ) of the serrations in hydrogen charging samples: (c) 220 mA cm-2; (d) 590 mA cm-2.

Table 1 Tensile mechanical properties of Inconel 718 alloy at various hydrogen charging current densities.

Current density (mA cm^-2)	Yield strength (MPa)	Tensile strength (MPa)	Fracture strain (%)
0	1191	1365	14.18
75	1184	1321	13.04
220	1131	1255	12.59
590	1070	1191	12.25

Fig. 3. SEM images of (a) hydrogen free sample; (b) hydrogen charged sample (590 mA cm-2); (c) and (d) high magnification images of area c and d in Fig. 3(b), respectively.

Fig. 4. (a) Schematic illustration of extracted TEM sample position; (b) Typical TEM micrograph in hydrogen-induced brittle zone of Inconel 718 alloy (590 mA cm-2).

References

[1]	H. Andersson, C. Persson, T. Hansson, Int. J. Fatigue 23 (2001) 817-827.
[2]	C. Slama, M. Abdellaoui, J. Alloys Compd. 306(2000) 277-284.
[3]	M. Rezende, L. Araujo, S. Gabriel, D. Dos Santos, L. De Almeida, Int. J. HydrogenEnergy 40 (2015) 17075-17083.
[4]	S.K. Mannan, J. Min. Met.Mater. Soc. 64(2012) 265-270.
[5]	L. Liu, K. Tanaka, A. Hirose, K.F. Kobayashi, Sci. Technol. Adv. Mater. 3(2002)335-344.
[6]	E. Loria, J. Met. 44(1992) 33-36.
[7]	Y. Wang, W. Shao, L. Zhen, C. Yang, X. Zhang, J. Alloys Compd. 471(2009)331-335.
[8]	P. Maj, J. Zdunek, M. Gizynski, J. Mizera, K. Kurzydlowski, Mater. Sci. Eng. A619(2014) 158-164.
[9]	C. Hale, W. Rollings, M. Weaver, Mater. Sci. Eng. A 300 (2001) 153-164.
[10]	Y. Cai, C. Tian, G. Zhang, G. Han, S. Yang, S. Fu, C. Cui, Q. Zhang, J. Alloys Compd.690(2017) 707-715.
[11]	M. Kattoura, S.R. Mannava, D. Qian, V.K. Vasudevan, Int. J. Fatigue 104 (2017) 366-378.
[12]	P. Maj, J. Zdunek, J. Mizera, K. Kurzydlowski, B. Sakowicz, M. Kaminski, Met.Mater Int. 23(2017) 54-67.
[13]	S. Jothi, S. Merzlikin, T. Croft, J. Andersson, S. Brown, J. Alloys Compd. 664(2016) 664-681.
[14]	M. LaCoursiere, D. Aidun, D. Morrison, J. Mater. Eng.Perform. 26(2017)2337-2345.
[15]	G. Obasi, Z. Zhang, D. Sampath, R. Morana, R. Akid, M. Preuss, Metall. Mater.Trans. A(2018) 1-15.
[16]	X. Li, Y. Wang, P. Zhang, B. Li, X. Song, J. Chen, Mater. Sci. Eng. A 616 (2014) 116-122.
[17]	X. Li, J. Zhang, J. Chen, S. Shen, G. Yang, T. Wang, X. Song, Mater. Sci. Eng. A 651(2016) 474-485.
[18]	X. Li, J. Zhang, E. Akiyama, Q. Li, Y. Wang, Corros. Sci. 128(2017) 198-212.
[19]	X. Li, J. Zhang, Y. Wang, M. Ma, S. Shen, X. Song, Mater. Des. 110(2016)602-615.
[20]	J.J.M. Jebaraj, D.J. Morrison, I.I. Suni, Corros. Sci. 80(2014) 517-522.
[21]	A.R. Troiano, Metall. Anal. 5(2016) 557-569.
[22]	A. Nagao, C.D. Smith, M. Dadfarnia, P. Sofronis, I.M. Robertson, Acta Mater. 60(2012) 5182-5189.
[23]	M. Martin, B. Somerday, R. Ritchie, P. Sofronis, I. Robertson, Acta Mater. 60(2012) 2739-2745.
[24]	Y. Ogawa, D. Birenis, H. Matsunaga, A. Th?gersen, ?. Prytz, O. Takakuwa, J.Yamabe, Scr. Mater. 140(2017) 13-17.
[25]	A. Chatterjee, G. Sharma, R. Tewari, J. Chakravartty, Metall. Mater. Trans. A 46(2015) 1097.
[26]	M. Koyama, Y. Shimomura, A. Chiba, E. Akiyama, K. Tsuzaki, Scr. Mater. 141(2017) 20-23.
[27]	A.H. Cottrell, B.A. Bilby, Phys. Soc. Lond. Proc. A 62 (1949) 49-62.