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Residual stresses and microstructure in Powder Bed Direct Laser Deposition (PB DLD) samples

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Abstract

In the present study, residual stresses in the Powder Bed Direct Laser Deposition (PB DLD) built parts were investigated using X-ray diffraction strain measurement and finite element simulation. The microstructure and texture of the DLD built parts were studied, indicating that the vertically elongated grains have preferred orientation of (001)-type pointing in the growth direction in the nickel superalloy C263. A conceptual model of residual stress generation was proposed using fictitious thermal expansion based on the argument that residual stresses arise from strain incompatibility that is “frozen in” within the work piece during fabrication.

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Acknowledgments

Authors would like to acknowledge the funding support of the EPSRC under projects EP/G035059/1 and EP/H003215/1, and Diamond Light Source for the provision beam time under allocations EE6974 and EE7016.

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Authors and Affiliations

  1. Singapore Institute of Manufacturing Technology, A* Star, Singapore, 638075, Singapore

    X. Song

  2. Department of Engineering Science, University of Oxford, Parks Road, Oxford, UK, OX1 3PJ

    M. Xie, F. Hofmann & A. M. Korsunsky

  3. Diamond Light Source, Beamline I12 JEEP, Didcot, Oxon, UK, OX11 0DE

    T. Connolley, C. Reinhard, R. C. Atwood, L. Connor & M. Drakopoulos

  4. Materials Application – Engineering, ELT-17, Rolls Royce Plc, Derby, UK, DE24 8BJ

    L. Frampton

  5. Materials Solutions, Great Western Business Park, McKenzie Way, Worcester, UK, WR4 9GN

    T. Illston

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  1. X. Song
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Correspondence to X. Song.

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Song, X., Xie, M., Hofmann, F. et al. Residual stresses and microstructure in Powder Bed Direct Laser Deposition (PB DLD) samples. Int J Mater Form 8, 245–254 (2015). https://doi.org/10.1007/s12289-014-1163-1

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  • DOI: https://doi.org/10.1007/s12289-014-1163-1

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