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Heat treatment possibilities for an in situ βTi-TiC composite made by laser powder bed fusion

Abstract : After laser powder bed fusion (LPBF) of an ultra-strong in situ TiC whisker reinforced β-Ti composite, this paper investigates the evolution of microstructure and mechanical properties in response to heat treatment at different temperatures. Using in depth nano-SEM and TEM analyses, it is shown that ageing at 400 °C rounds the whiskers, annihilates the strain fields and grows Mo segregated nano-cells, but without improving the ductility. In contrast, ageing at 600 °C enables the transformation of metastable β to a lamellar β + α, leading to a dual phase matrix embedding TiC particles. This is in such a manner that extra ageing at 600 °C coalesces the nano-lamellar α + β microstructure to form a coarser micro-lamellar α + β matrix. This microstructure achieves 66 % of the compressive deformation of Cp-Ti, and over 1400 MPa compressive strength after 1 h of ageing at 600 °C. Despite this success under compression, hard and stiff TiC particles may still cause large spherical fractured voids, severely limiting the plastic deformation under tension.
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https://hal.univ-lille.fr/hal-02960995
Contributeur : Lilloa Université de Lille <>
Soumis le : jeudi 8 octobre 2020 - 10:07:07
Dernière modification le : samedi 10 octobre 2020 - 03:29:36

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Sasan Dadbakhsh, Raya Mertens, Gang Ji, Bey Vrancken, Kim Vanmeensel, et al.. Heat treatment possibilities for an in situ βTi-TiC composite made by laser powder bed fusion. Additive Manufacturing, Elsevier, 2020, Additive Manufacturing, pp.101577. ⟨10.1016/j.addma.2020.101577⟩. ⟨hal-02960995⟩

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