Review of the damage mechanism in wind turbine gearbox bearings under rolling contact fatigue

Abstract

Wind turbine gearbox bearings fail with the service life is much shorter than the designed life. Gearbox bearings are subjected to rolling contact fatigue (RCF) and they are observed to fail due to axial cracking, surface flaking, and the formation of white etching areas (WEAs). The current study reviewed these three typical failure modes. The underlying dominant mechanisms were discussed with emphasis on the formation mechanism of WEAs. Although numerous studies have been carried out, the formation of WEAs remains unclear. The prevailing mechanism of the rubbing of crack faces that generates WEAs was questioned by the authors. WEAs were compared with adiabatic shear bands (ASBs) generated in the high strain rate deformation in terms of microstructural compositions, grain refinement, and formation mechanism. Results indicate that a number of similarities exist between them. However, substantial evidence is required to verify whether or not WEAs and ASBs are the same matters.

Graphical abstract

Keywords

rolling contact fatigue (RCF) / white etching area (WEA) / white etching crack (WEC) / adiabatic shear band (ASB)

References

[1] Whittle M, Trevelyan J, Tavner P J. Bearing currents in wind turbine generators. Journal of Renewable and Sustainable Energy, 2013, 5(5): 053128

[2] Evans M H. White structure flaking (WSF) in wind turbine gearbox bearings: Effects of ‘butterflies’ and white etching cracks (WECs). Materials Science and Technology, 2012, 28(1): 3–22

[3] Morthorst P E, Awerbuch S. The Economics of Wind Energy: A report by the European Wind Energy Association. 2009.

[4] Evans M H, Walker J C, Ma C, A FIB/TEM study of butterfly crack formation and white etching area (WEA) microstructural changes under rolling contact fatigue in 100Cr6 bearing steel. Materials Science and Engineering: A, 2013, 570: 127–134

[5] Grabulov A, Petrov R, Zandbergen H W. EBSD investigation of the crack initiation and TEM/FIB analyses of the microstructural changes around the cracks formed under rolling contact fatigue (RCF). International Journal of Fatigue, 2010, 32(3): 576–583

[6] Evans M H, Richardson A D, Wang L, Serial sectioning investigation of butterfly and white etching crack (WEC) formation in wind turbine gearbox bearings. Wear, 2013, 302(1–2): 1573–1582

[7] Grabulov A, Ziese U, Zandbergen H W. TEM/SEM investigation of microstructural changes within the white etching area under rolling contact fatigue and 3-D crack reconstruction by focused ion beam. Scripta Materialia, 2007, 57(7): 635–638

[8] Hashimoto K, Hiraoka K, Kida K, Effect of sulphide inclusions on rolling contact fatigue life of bearing steels. Materials Science and Technology, 2012, 28(1): 39–43

[9] Errichello R, Budny R, Eckert R. Investigations of bearing failures associated with white etching areas (WEAs) in wind turbine gearboxes. Tribology Transactions, 2013, 56(6): 1069–1076

[10] Evans M H. An updated review: White etching cracks (WECs) and axial cracks in wind turbine gearbox bearings. Materials Science and Technology, 2016, 32(11): 1133–1169

[11] Janakiraman S, West O, Klit P, Observations of the effect of varying hoop stress on fatigue failure and the formation of white etching areas in hydrogen infused 100Cr6 steel rings. International Journal of Fatigue, 2015, 77: 128–140

[12] Luyckx J. White etching crack failure mode in roller bearings: From observation via analysis to understanding and an industrial solution. Rolling Element Bearings, 2012, 1542: 1–25

[13] Luyckx J. Hammering wear impact fatigue hypothesis WEC/irWEA failure mode on roller bearings. 2011.

[14] Sakai T, Lian B, Takeda M, Statistical duplex S-N, characteristics of high carbon chromium bearing steel in rotating bending in very high cycle regime. International Journal of Fatigue, 2010, 32(3): 497–504

[15] Ruellan A, Ville F, Kleber X. Understanding white etching cracks in rolling element bearings: The effect of hydrogen charging on the formation mechanisms. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2014, 228(11): 1252–1265

[16] Li Y, Kang G, Wang C, Vertical short-crack behavior and its application in rolling contact fatigue. International Journal of Fatigue, 2006, 28(7): 804–811

[17] Donzella G, Petrogalli C. A failure assessment diagram for components subjected to rolling contact loading. International Journal of Fatigue, 2010, 32(2): 256–268

[18] Kailas S V. A study of the strain rate microstructural response and wear of metals. Journal of Materials Engineering and Performance, 2003, 12(6): 629–637

[19] Seo J W, Jun H K, Kwon S J, Rolling contact fatigue and wear of two different rail steels under rolling-sliding contact. International Journal of Fatigue, 2016, 83: 184–194

[20] Holweger W, Wolf M, Merk D, White etching crack root cause investigations. Tribology Transactions, 2015, 58(1): 59–69

[21] Gould B, Greco A. The influence of sliding and contact severity on the generation of white etching cracks. Tribology Letters, 2015, 60(2): 29

[22] Nélias D, Dumont M L, Champiot F, Role of inclusions, surface roughness and operating conditions on rolling contact fatigue. Journal of Tribology, 1999, 121(2): 240–250

[23] Solano-Alvarez W, Pickering E J, Peet M J, Soft novel form of white-etching matter and ductile failure of carbide-free bainitic steels under rolling contact stresses. Acta Materialia, 2016, 121: 215–226

[24] Kang J H, Hosseinkhani B, Rivera-díaz-del-castillo P E J. Rolling contact fatigue in bearings: Multiscale overview. Materials Science and Technology, 2012, 28(1): 44–49

[25] Harada H, Mikami T, Shibata M, Microstructural changes and crack initiation with white etching area formation under rolling/sliding contact in bearing steel. ISIJ International, 2005, 45(12): 1897–1902

[26] Baumann G, Knothe K, Fecht H J. Surface modification, corrugation and nanostructure formation of high speed railway tracks. Nanostructured Materials, 1997, 9(1–8): 751–754

[27] Qin X, Sun D, Xie L, Hardening mechanism of Cr5 backup roll material induced by rolling contact fatigue. Materials Science and Engineering: A, 2014, 600: 195–199

[28] Evans M H, Richardson A D, Wang L, Confirming subsurface initiation at non-metallic inclusions as one mechanism for white etching crack (WEC) formation. Tribology International, 2014, 75: 87–97

[29] Imai Y, Endo T, Dong D, Study on rolling contact fatigue in hydrogen environment at a contact pressure below basic static load capacity. Tribology Transactions, 2010, 53(5): 764–770

[30] Uyama H, Yamada H, Hidaka H, The effects of hydrogen on microstructural change and surface originated flaking in rolling contact fatigue. Tribology Online, 2011, 6(2): 123–132

[31] Bruce T, Rounding E, Long H, Characterisation of white etching crack damage in wind turbine gear-box bearings. Wear, 2015, 338–339: 164–177

[32] Kino N, Otani K. The influence of hydrogen on rolling contact fatigue life and its improvement. JSAE Review, 2003, 24(3): 289–294

[33] Vegter R H, Slycke J T, Beswick J, The role of hydrogen on rolling contact fatigue response of rolling element bearings. Journal of ASTM International, 2010, 7(2): 102543

[34] Hiraoka K, Fujimatsu T, Tsunekage N, Generation process observation of microstructural change in rolling contact fatigue by hydrogen-charged specimens. Japanese Journal of Tribology, 2007, 52(6): 673–683

[35] Ray D, Vincent L, Coquillet B, Hydrogen embrittlement of a stainless ball bearing steel. Wear, 1980, 65(1): 103–111

[36] Hamada H, Matsubara Y. The influence of hydrogen on tension-compression and rolling contact fatigue properties in bearing steel. NTN Technical Review, 2006, 74: 54–61

[37] Evans M H, Richardson A D, Wang L, Effect of hydrogen on butterfly and white etching crack (WEC) formation under rolling contact fatigue (RCF). Wear, 2013, 306(1–2): 226–241

[38] Kang J H, Vegter R H, Rivera-Díaz-del-Castillo P E J. Rolling contact fatigue in martensitic 100Cr6: Subsurface hardening and crack formation. Materials Science and Engineering: A, 2014, 607: 328–333

[39] Kang J H, Hosseinkhani B, Williams C A, Solute redistribution in the nanocrystalline structure formed in bearing steels. Scripta Materialia, 2013, 69(8): 630–633

[40] Li S, Su Y, Shu X, Microstructural evolution in bearing steel under rolling contact fatigue. Wear, 2017, 380–381: 146–153

[41] Lai J, Stadler K. Investigation on the mechanisms of white etching crack (WEC) formation in rolling contact fatigue and identification of a root cause for bearing premature failure. Wear, 2016, 364–365: 244–256

[42] Hiraoka K, Nagao M, Isomoto T. Study on flaking process in bearings by white etching area generation. Journal of ASTM International, 2006, 3(5): 14059

[43] Solano-Alvarez W, Duff J, Smith M C, Elucidating white-etching matter through high-strain rate tensile testing. Materials Science and Technology, 2017, 33(3): 307–310

[44] Warhadpande A, Sadeghi F, Evans R D. Microstructural alterations in bearing steels under rolling contact fatigue Part 1—Historical overview. Tribology Transactions, 2013, 56(3): 349–358

[45] Gould B, Greco A. Investigating the process of white etching crack initiation in bearing steel. Tribology Letters, 2016, 62(2): 26

[46] Wei Q, Kecskes L, Jiao T, Adiabatic shear banding in ultrafine-grained Fe processed by severe plastic deformation. Acta Materialia, 2004, 52(7): 1859–1869

[47] Li N, Wang Y D, Lin Peng R, Localized amorphism after high-strain-rate deformation in TWIP steel. Acta Materialia, 2011, 59(16): 6369–6377

[48] Li S, Zhao P, He Y, Microstructural evolution associated with shear location of AISI 52100 under high strain rate loading. Materials Science and Engineering: A, 2016, 662: 46–53

[49] Wang B F, Yang Y. Microstructure evolution in adiabatic shear band in fine-grain-sized Ti-3Al-5Mo-4.5V alloy. Materials Science and Engineering: A, 2008, 473(1–2): 306–311

[50] Peirs J, Tirry W, Amin-Ahmadi B, Microstructure of adiabatic shear bands in Ti6Al4V. Materials Characterization, 2013, 75: 79–92

[51] Voskamp A P. Material response to rolling contact loading. Journal of Tribology, 1985, 107(3): 359–364

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51275225).

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2018 Higher Education Press and Springer-Verlag GmbH Germany