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Measurement of fracture toughness of metallic materials produced by additive manufacturing

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Abstract

This study focuses on the microstructure and mechanical properties of metallic materials produced by additive layer manufacturing (ALM), especially the laser beam melting process. The influence of the specimen orientation during the ALM process and that of two post-build thermal treatments were investigated. The identified metal powder is Ti-6Al-4V (titanium base). Metallographic analysis shows their effects on the microstructure of the metals. Mechanical experiments involving tensile tests as well as toughness tests were performed according to ASTM (American Society for Testing and Materials) norms. The results show that the main influence is that of the thermal treatments; however the manufacturing stacking direction may lead to some anisotropy in the mechanical properties.

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Abbreviations

K IC :

Mode I fracture toughness

E :

Young modulus

YS:

Yield stress

UTS:

Ultimate tensile stress

A :

Plastic elongation

ALM:

Additive layer manufacturing

AM:

Additive manufacturing

ASTM:

American Society for Testing and Materials

EBM:

Electron beam melting

HIP:

Hot isostatic pressing

LBM:

Laser beam melting

SEM:

Scanning electron microscope

SLM:

Selective laser melting

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Acknowledgements

The authors wish to acknowledge Centre National des Etudes Spatiales (CNES) for support through Grant no. 160025/00 and implication during the recurrent informal meetings. We also thank FusiA company for providing the heat treated manufactured samples, and Thales Alenia Space for the technical discussions. Our acknowledgement also to Exova company for preparing the toughness samples.

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Authors and Affiliations

  1. Icam, 75 av. de Grande Bretagne, 31076, Toulouse, France

    O. Quénard, O. Dorival & Ph. Guy

  2. Université de Toulouse, Institut Clément Ader, UMR CNRS 5312, INSA/UPS/ISAE/Mines Albi, 3 rue Caroline Aigle, 31400, Toulouse, France

    O. Dorival

  3. FusiA, 8 rue Claude Gonin, 31400, Toulouse, France

    A. Votié

  4. CNES, 18 av. Edouard Belin, 31401, Toulouse, France

    K. Brethome

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  1. O. Quénard
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  2. O. Dorival
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Correspondence to O. Quénard.

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Quénard, O., Dorival, O., Guy, P. et al. Measurement of fracture toughness of metallic materials produced by additive manufacturing. CEAS Space J 10, 343–353 (2018). https://doi.org/10.1007/s12567-018-0202-z

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  • DOI: https://doi.org/10.1007/s12567-018-0202-z

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