Ti–6Al–4V alloys have been developed not only as structural materials for aerospace field but also as biomaterials for orthopedic surgery. As a crack growth mechanism under corrosive condition for Ti–6Al–4V alloys, mechanisms of anodic dissolvent chemical reaction and hydrogen embrittlement (HE) caused by chemical corrosive reaction have been proposed, however, the latter has not yet been clarified. In this study, corrosion fatigue (CF) crack growth tests under ringer and 3.5% NaCl solution were conducted for various type of Ti–6Al–4V alloys such as forging and casting with different values of yield stress. The characteristics of load frequency of corrosion fatigue crack growth rate (CFCGR) were investigated for these materials. It was found that various characteristics of load frequency for CFCGR appear depending on yield stress and concentration of NaCl solution. In some cases, it was found to show different characteristics of load frequency of CFCGR from those dominated by usual time dependent mechanism. In this research, a map of load frequency of CFCGR for these materials were established in terms of concentration of NaCl and yield stress. Finally some considerations were conducted which concerns the mechanisms of CFCGR such as anodic corrosive reaction and hydrogen embrittlement.
GregoryJ.K., Fatigue crack propagation in titanium alloys, in: Handbook of Fatigue Crack Propagation in Metallic StructuresCarpinteriA., ed., Elsevier Science, 1994, pp. 281–322.
2.
DawsonD.B. and PellouxR.M., Effect of cyclic stress wave form on corrosion fatigue crack propagation in Al–Zn–Mg Alloys, Metallurgical Transactions5 (1974), 723–731. doi:10.1007/BF02644669.
3.
GregoryJ.K. and BrokmeierH.G., The relationship between crystallographic texture and salt water cracking susceptibility in Ti–6Al–4V, Materials Science and Engineering A203 (1995), 365–372. doi:10.1016/0921-5093(95)09820-8.
4.
DingY.S.TsayL.W. and ChenC., The effect of hydrogen on fatigue crack growth behavior of Ti–6Al–4V and Ti–4.5Al 3V–2Mo–2Fe alloys, Corrosion Science51 (2009), 1413–1419. doi:10.1016/j.corsci.2009.03.031.
5.
NagaokaA.YokoyamaK. and SakaiJ., Evaluation of hydrogen absorption behavior during acid etching for surface modification of commercial pure Ti, Ti–6Al–4V and Ni–Ti superelastic alloys, Corrosion Science52 (2010), 1130–1138. doi:10.1016/j.corsci.2009.12.029.
6.
SomerdayB.P.SofronisP.NiburK.A.San MarchiC. and KirchheimR., Elucidating the variables affecting accelerated fatigue crack growth of steels in hydrogen gas with low oxygen concntrations, Acta Materialia61 (2013), 6153–6170. doi:10.1016/j.actamat.2013.07.001.
7.
GaddamR.PedersonR.HornqvistM. and AnttiM.-L., Fatigue crack growth behavior of forged Ti–6Al–4V in gaseous hydrogen, Corrosion Science78 (2014), 378–383. doi:10.1016/j.corsci.2013.08.009.
8.
PulsM.P., Effect of crack tip stress states and hydride-matrix interaction stresses on delayed hydride cracking, Metall. Trans. A21 (1990), 2905–2917. doi:10.1007/BF02647211.
9.
BarsomJ.M., Effects of cyclic stress form on corrosion fatigue crack propagation below KIscc in a high strength steel, in: Proc. Int. Conf. on Corrosion Fatigue, Vols NACA-2, 1972, pp. 424–436.
10.
EndoK. and KomaiK., Low cycle corrosion fatigue of aluminum alloy, J. Soc. Mat. Sci., Japan14 (1965), 827–832(in Japanese). doi:10.2472/jsms.14.827.
11.
SelinesR.J. and PellouxR.M., Effect of cyclic stress wave form on corrosion fatigue crack propagation in Al–Zn–Mg alloys, Met. Trans.3 (1972), 2525–2531. doi:10.1007/BF02647058.
12.
YokoboriA.T.Jr.YokoboriT. and TakasuN., Stress hold time, stress rate and frequency effects on fracture under corrosive environment and under high temperature creep, fatigue and creep-fatigue interaction conditions, in: Mechanical Behaviouur of Materilals-IVCarlssonJ. and OhlsonN.G., eds, pp. 967–981.
13.
YokoboriA.T.Jr.YokoboriT.KosumiT. and TakasuN., Effect of frequency, stress rising time and stress hold time on corrosion fatigue crack growth behavior of low alloy Cr–Mo steel, Proc. published by ASM, Metals/Materials Technology Series, designates publication volume of technical paper 8517-034, Corrosion Cracking, 1986, pp. 1–9.
14.
NewmanJ.C.Jr., Fracture Analysis, ASTM STP, Vol. 560, American Society for Testing and Materials, 1974, pp. 105–121.
15.
ChindaY.YokoboriA.T.Jr. and KondohT., Corrosion fatigue crack growth behaviour of thin plate specimens for Ti–6AV–4V alloys, Japanese Soc. Strength and Fracture33 (1999), 81–86(in Japanese).
16.
GarfinkleM., An electrochemical model of hot-salt stress-corrosion of titanium alloys, Metallurgical Transactions4 (1973), 1677–1686. doi:10.1007/BF02666196.
17.
WatanabeT.NaitoH. and NakamuraY., Crevice corrosion behavior of commercially pure titanium in NaCl–HCl solutions, J. Japan Inst. Metals50 (1986), 822–827(in Japanese).
18.
TokajiK.NakajimaM.OgawaT. and ShimizuT., Anisotropic fatigue crack propagation of Ti–6Al–4V alloy in 3% NaCl solution, J. Soc. Mat. Sci., Japan42 (1993), 1319–1325(in Japanese). doi:10.2472/jsms.42.1319.
19.
YokoboriA.T.Jr.NemotoT.SatohK. and YamadaT., Numerical analysis on hydrogen diffusion and concentration in solid with emission around the crack, Engineering Fracture Mechanics55(1) (1996), 47–60. doi:10.1016/0013-7944(96)00002-1.
20.
YokoboriA.T.Jr.OhmiT.MurakawaT.NemotoT.UesugiT. and SugiuraR., The application of the analysis of potential driven particle diffusion to the strength of materials, Strength, Fracture and Complexity, An Int. J.7 (2011), 215–233.
21.
OhmiT.YokoboriA.T.Jr. and TakeiT., Flow controllability of hydrogen diffusion driven by local stress field for steel under cyclic loading condition, Defect and Diffusion Forum326–328 (2012), 626–631. doi:10.4028/www.scientific.net/DDF.326-328.626.
22.
OhmiT.YokoboriA.T.Jr.KawashimaY. and NishikawaM., Numerical analysis of stress induced particle diffusion based on the FEM–FDM coupled method-hydrogen diffusion, in: Proc. JSME-CMD ICMS, Kobe, Japan, 2012.
23.
OrianiR.A., Fundamental Aspects of Stress Corrosion Cracking, NACE, Houston, 1969, pp. 32–49.
24.
TrianoA.R., The role of hydrogen and other interstitials in the mechanical behaviour of metals, Trans. ASM52 (1960), 54–80.
25.
LeeuwenH.P., The kinetics of hydrogen embrittlement: A quantitative diffusion model, Eng, Fract. Mech.6 (1974), 141–161. doi:10.1016/0013-7944(74)90053-8.
26.
YokoboriA.T.Jr. and OhmiT., The significance of α multiplication method for numerical analysis of potential induced particle diffusion, Strength, Fracture and Complexity An Int. J8 (2014), 117–124.
27.
YokoboriA.T.Jr.UesugiT.SendohM. and ShibataM., The effect of stress wave form on corrosion fatigue crack growth rate on the basis of hydrogen diffusion theory, Strength, Fracture and Complexity An Int. J1 (2004), 187–204.
28.
NakajimaT.MatsunagaH.YoshikawaM.TsuzakiK. and MatsuokaS., Frequency dependence of fatigue crack acceleration due to hydrogen in cold-rolled type 304 steel, in: CAMP-ISIJ, 2014, 422 pp. (in Japanese).
