High-cycle fatigue behaviour and mechanism analysis of a forged TiZr-based alloy

Abstract

Fatigue resistance, particularly the endurance limit, is an important design consideration in engineering applications for TiZr-based alloys. The investigated Ti–20Zr–6Al–4 V (wt-%) alloy exhibited a high fatigue endurance limit of 775 MPa. Results showed that severe local stress concentration due to extensive dislocation pile-up at α/β interfaces was responsible for the crack initiation. A transition from a tensile mode to a shear mode crack was observed during crack propagation. Many striations as well as some micro-cracks which can improve the resistance to crack propagation exist in the stable crack-propagation region. A localised deviation between the crack-growth direction was also found, and this outcome combined with micro-cracks and tear ridge may be attributed to varied crystallographic orientations between different phases.

Keywords

Titanium alloy Microstructure Fatigue behaviour Electron microscopy

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References

Liang

S. X.

, Ma

M. Z.

, Jing

, Tan

C. L.

and Liu

R. P.

: ‘Structural evolution and mechanical properties of Zr-45Ti-5Al-3 V alloy by heat treatments’, Mater. Sci. Eng. A, 2012, 541, 67–72. doi: 10.1016/j.msea.2012.02.003

Auffredic

J. P.

, Etchessahar

and Debuigne

: ‘Remarques sur le diagramme de phases Ti-Zr: Étude microcalorimétrique de la transition α ⇄ β’, J. Less Common Met., 1982, 84, 49–64. doi: 10.1016/0022-5088(82)90127-8

Burgers

W. G.

: ‘On the process of transition of the cubic-body-centered modification into the hexagonal-close-packed modification of zirconium’, Physica, 1934, 1, (7–12), 561–86. doi: 10.1016/S0031-8914(34)80244-3

Liang

S. X.

, Yin

L. X.

, Che

H. W.

, Jing

, Zhou

Y. K.

, Ma

M. Z.

and Liu

R. P.

: ‘Effects of Al content on structure and mechanical properties of hot-rolled ZrTiAlV alloys’, Mater. Des., 2013, 52, 246–250. doi: 10.1016/j.matdes.2013.05.065

Y. J.

, Fu

R. D.

, Du

D. X.

, Jing

L. J.

, Sang

D. L.

and Zhang

X. Y.

: Microstructures and mechanical properties of friction stir welded joints of Zr-Ti alloy’, Sci. Technol. Weld. Join., 2014, 19, 588–594. doi: 10.1179/1362171814Y.0000000229

Feng

Z. H.

, Jiang

X. J.

, Zhou

Y. K.

, Xia

C. Q.

, Zhang

X. Y.

, Ma

M. Z.

and Liu

R. P.

: ‘Hot deformation behavior and the processing map of Zr-1.0Be alloy in single α phase’, Prog. Nat. Sci. https://dx-doi-org.web.bisu.edu.cn/10.1016/j.pnsc.2015.09.013

Tan

Y. B.

, Yang

L. H.

, Tian

, Liu

R. P.

, Zhang

X. Y.

and Liu

W. C.

: ‘Hot deformation behavior of ZrTiAlV alloy with a coarse grain structure in the β phase field’, Mater. Sci. Eng. A, 2013, 577, 218–224. doi: 10.1016/j.msea.2013.04.056

Tan

Y. B.

, Liu

W. C.

, Yuan

, Liu

R. P.

and Zhang

X. Y.

: ‘On the phenomenon of stress drop during hot deformation of ZrTiAlV alloy’, Metall. Mater. Trans. A, 2013, 44, 5284–5288. doi: 10.1007/s11661-013-2018-y

Jing

, Liang

S. X.

, Liu

C. Y.

, Ma

M. Z.

, Zhang

X. Y.

and Liu

R. P.

: ‘Aging effects on the microstructures and mechanical properties of the Ti-20Zr-6.5Al-4 V alloy’, Mater. Sci. Eng. A, 2013, 559, 474–479. doi: 10.1016/j.msea.2012.08.128

10.

Boyer

R. R.

: ‘Applications of beta titanium alloys in airframes’, in ‘Beta titanium alloys in the 1990′s’, (ed. Eylon

, Boyer

R. R.

and Koss

D. A.

), 335–346; 1993, Warrendale, PA, TMS.

11.

Jha

S. K.

and Ravichandran

K. S.

: ‘High-cycle fatigue resistance in beta-titanium alloys’, Adv. Mater., 2000, 52, (3), 30–35.

12.

Krupp

: ‘Fatigue crack propagation in metals and alloys’, 2007, Oxford Kidlington, Wiley-VCH.

13.

G. Q.

, Shi

C. L.

, Sha

A. X.

and Jiang

H. R.

: ‘Effect of microstructure on the fatigue properties of Ti–6Al–4 V titanium alloys’, Mater. Des., 2013, 46, 668–674. doi: 10.1016/j.matdes.2012.10.059

14.

Morrissey

R. J.

, McDowell

D. L.

and Nicholas

: ‘Frequency and stress ratio effects in high cycle fatigue of Ti-6Al-4 V’, Int. J. Fatigue, 1999, 21, 679–685. doi: 10.1016/S0142-1123(99)00030-4

15.

Dowling

N. E.

: ‘Mechanical behavior of materials: engineering methods for deformation, fracture and fatigue’, 2nd ed, 1998, New York, Prentice Hall.

16.

Shi

X. H.

, Zeng

W. D.

, Xue

S. K.

and Jia

Z. Q.

: ‘The crack initiation behavior and the fatigue limit of Ti-5Al-5Mo-5V-1Cr-1Fe titanium alloy with basket-weave microstructure’, J. Alloys Compd., 2015, 631, 340–349. doi: 10.1016/j.jallcom.2015.01.077

17.

Ravi Chandran

K. S.

and Jha

S. K.

: ‘Duality of the S–N fatigue curve caused by competing failure modes in a titanium alloy and the role of Poisson defect statistics’, Acta Mater., 2005, 53, 1867–1881. doi: 10.1016/j.actamat.2004.12.032

18.

Sen

, Gopinath

, Datta

and Ramamurty

: ‘Fatigue in Ti-6Al-4V-B alloys’, Acta Mater., 2010, 58, 6799–6809. doi: 10.1016/j.actamat.2010.09.008

19.

Hall

J. A.

: ‘Fatigue crack initiation in alpha-beta titanium alloys’, Int. J. Fatigue, 1997, 19, S23–S37. doi: 10.1016/S0142-1123(97)00047-9

20.

Jha

S. K.

, Szczepanski

C. J.

, Golden

P. J.

, Porter

W. J.

III and John

: ‘Characterization of fatigue crack-initiation facets in relation to lifetime variability in Ti-6Al-4 V’, Int. J. Fatigue, 2012, 42, 248–257. doi: 10.1016/j.ijfatigue.2011.11.017

21.

Y. M.

, Jeong

Y. H.

, Lee

K. J.

and Kim

S. J.

: ‘Effect of various alloying elements on the martensitic transformation in Zr–0.8 Sn alloy’, J. Alloys Compd, 2000, 307, 318–323. doi: 10.1016/S0925-8388(00)00871-9

22.

Kong

, Chen

and Yang

: ‘Effect of heat treatment on microstructures and tensile properties of as-forged Ti-45Al-5Nb-0.3Y alloy’, Intermetallics, 2011, 19, (2), 212–216. doi: 10.1016/j.intermet.2010.08.012

23.

Rack

H. J.

and Qazi

J. I.

: ‘Titanium alloys for biomedical applications’, Mater. Sci. Eng. C, 2006, 26, (8), 1269–1277. doi: 10.1016/j.msec.2005.08.032

24.

Antolovich

S. D.

and Armstrong

R. W.

: ‘Plastic strain localization in metals: origins and consequences’, Prog. Mater. Sci., 2014, 59, 1–160. doi: 10.1016/j.pmatsci.2013.06.001

25.

Pineau

and Antolovich

S. D.

: ‘Intergranular fatigue’, in ‘Grain boundaries and crystalline plasticity’, (ed. Priester

Louisette

), 217–280; 2011, Hoboken, New Jersey, USA, John Wiley and Sons.

26.

Gong

and Wilkinson

A. J.

: ‘Anisotropy in the plastic flow properties of single-crystal α titanium determined from micro-cantilever beams’, Acta Mater., 2009, 57, 5693–5705. doi: 10.1016/j.actamat.2009.07.064

27.

Jha

S. K.

, Szczepanski

C. J.

, John

and Larsen

J. M.

: ‘Deformation heterogeneities and their role in life-limiting fatigue failures in a two-phase titanium alloy’, Acta Mater., 2015, 82, 378–395. doi: 10.1016/j.actamat.2014.08.034

28.

Tan

, Li

, Sun

, Xiao

, Zhao

and Sun

: ‘Effect of α-phase morphology on low-cycle fatigue behavior of TC21 alloy’, Int. J. Fatigue, 2015, 75, 1–9. doi: 10.1016/j.ijfatigue.2015.01.010

29.

Venkatramani

, Ghosh

and Mills

: ‘A size-dependent crystal plasticity finite-element model for creep and load shedding in polycrystalline titanium alloys’, Acta Mater., 2007, 55, (11), 3971–3986. doi: 10.1016/j.actamat.2007.03.017

30.

Bellows

R. S.

, Muju

and Nicholas

: ‘Validation of the step test method for generating Haigh diagrams for Ti-6Al-4 V’, Int. J. Fatigue., 1999, 21, (7), 687–697. doi: 10.1016/S0142-1123(99)00032-8

31.

Wang

, Zeng

W. D.

, Ma

, Zhou

J. H.

, Wang

X. Y.

and Wang

: ‘Study of fatigue properties of forged BT25 titanium alloy based on fractographic and quantitative microstructural analysis’, Mater. Sci. Technol., 2015, 33, (2), 212–219. doi: 10.1179/1743284713Y.0000000495

32.

Brooks

C. R.

and Choudhury

: ‘Fracture mechanisms and microfractographic features’, in ‘Metallurgical failure analysis’, (ed. Brooks

C. R.

and Choudhury

), Chapter [3]; 1993, New York, McGraw-Hill.

33.

Laird

, Finney

J. M.

and Doris

K. W.

: ‘Dislocation behavior in fatigue VI: variation in the localization of strain in persistent slip bands’, Mater. Sci. Eng., 1981, 50, 127–136. doi: 10.1016/0025-5416(81)90093-8

34.

Cashman

G. T.

: ‘A review of competing modes fatigue behavior’, Inter. J. Fatigue, 2010, 32, 492–496. doi: 10.1016/j.ijfatigue.2009.04.018

35.

Yue

, Wang

, Ma

D. Q.

, Tian

J. F.

, Zhang

X. Y.

, Jing

, Ma

M. Z.

and Liu

R. P.

: ‘Fatigue behavior of a Zr-based bulk metallic glass under uniaxial tension-tension and three-point bending loading mode’, Intermetallics, 2015, 60, 86–91. doi: 10.1016/j.intermet.2015.02.005

36.

Schijve

: ‘Fatigue of structure and materials’, 2nd edn, 2009, Delt, Springer Science+Business Media.

37.

Song

, Wang

, Niinomib

, Nakai

, Liu

and Zhu

M. Y.

: ‘Microstructure and fatigue behaviors of a biomedical Ti-Nb-Ta-Zr alloy with trace CeO₂ additions’, Mater. Sci. Eng. A, 2014, 619, 112–118. doi: 10.1016/j.msea.2014.09.069

38.

Gaddam

, Pederson

, Hörnqvist

and Antti

M. L.

: ‘Fatigue crack growth behaviour of forged Ti-6Al-4 V in gaseous hydrogen’, Corros. Sci., 2014, 78, 378–383. doi: 10.1016/j.corsci.2013.08.009

39.

Lin

C. W.

, Ju

C. P.

and Lin

J. H. C.

: ‘A comparison of the fatigue behavior of cast Ti-7.5Mo with c.p. titanium, Ti-6Al-4 V and Ti-13Nb-13Zr alloys’, Biomaterials, 2005, 26, 2899–2907. doi: 10.1016/j.biomaterials.2004.09.007

40.

Yang

, Wang

T. S.

, Zhang

and Zhang

F. C.

: ‘High-cycle bending fatigue behavior of nanostructured bainitic steel’, Scripta Mater., 2012, 66, 363–366. doi: 10.1016/j.scriptamat.2011.11.033