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Fatigue crack growth behaviour in Ti6Al4V alloy specimens produced by selective laser melting

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Abstract

The current study presents the fatigue crack growth behaviour of titanium alloy Ti6Al4V parts manufactured by selective laser melting (SLM), obtained as standard 6 mm thick compact specimens (CT). Both the crack propagation under constant amplitude loading and the transient crack growth behaviour after the application of overloads were studied. The effect of the mean stress and the transient retardation behaviour were analysed using the crack closure parameter, obtained both by compliance and digital image correlation techniques. A reduced crack closure level for the stress ratio \(\hbox {R}=0\) was detected and for \(\hbox {R}=0.4\) no crack closure was observed. The digital image correlation technique showed better results in the Paris regime and during the transient retardation behaviour. The overload application produced crack growth retardation due to the increase of the crack closure effect. The failure surfaces showed a transgranular crack growth in \(\upbeta \) phase contouring the martensitic \(\upalpha \) phase.

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Acknowledgements

The authors would like to acknowledge the sponsoring under the Project No. 028789, financed by the European Regional Development Fund (FEDER), through the Portugal-2020 program (PT2020 and also acknowledge the Project No. 042536-18/SI/2018, financed by European Funds, through program COMPETE2020, under the Eureka smart label S0129-AddDies.

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Authors and Affiliations

  1. CEMMPRE, Department of Mechanical Engineering, University of Coimbra, 3004-516, Coimbra, Portugal

    J. S. Jesus, L. P. Borrego, J. A. M. Ferreira, J. D. Costa & C. Capela

  2. Department of Mechanical Enginnering, Coimbra Polytechnic-ISEC, Rua Pedro Nunes, 3030-199, Coimbra, Portugal

    L. P. Borrego

  3. Department of Mechanical Enginnering, Instituto Politécnico de Leiria, Morro do Lena - Alto Vieiro, 2400-901, Leiria, Portugal

    C. Capela

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  1. J. S. Jesus
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  2. L. P. Borrego
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  3. J. A. M. Ferreira
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  4. J. D. Costa
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Correspondence to J. S. Jesus.

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Jesus, J.S., Borrego, L.P., Ferreira, J.A.M. et al. Fatigue crack growth behaviour in Ti6Al4V alloy specimens produced by selective laser melting. Int J Fract 223, 123–133 (2020). https://doi.org/10.1007/s10704-019-00417-2

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