Additive layer manufacturing of titanium matrix composites using the direct metal deposition laser process

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:677

Article

Pouzet, S.¹  Peyre, P.¹  Gorny, C.¹  Castelnau, O.¹  Baudin, T.²  Brisset, F.²  Colin, C.³  Gadaud, P.⁴ 

[1] CNRS, PIMM Lab, UMR 8006, Arts & Metiers Paristech,CNAM, F-75013 Paris, France

[2] Univ Paris 11, ICMMO, F-91405 Orsay, France

[3] Mines Paris Tech, Ctr Mat, F-91000 Evry, France

[4] Univ Poitiers, Inst PPRIME, UMR CNRS CNRS ENSMA, F-86961 Futuroscope, France

关键词: DMD;    Laser;    Titanium;    Composites;    TiB;   

DOI  :  10.1016/j.msea.2016.09.002

来源: Elsevier

【 摘 要 】

Titanium Matrix Composites (TMC's) containing various volume fractions of (TiB+TiC) particles have been deposited from powder feedstocks consisting of a blend of pre-alloyed (Ti-6Al-4V+B4C) powders, using the direct metal deposition (DMD) laser process and the in-situ chemical reaction 5Ti+-B4C--> 4TiB+TiC. Process optimization has allowed to obtain a homogeneous distribution of tiny TiB whiskers within the Ti-6Al-4V alpha/beta matrix, with a full solubilization of C for low B4C contents (0.5 wt% and 1.5 wt%), and the formation of a small amount of globular TiC particles at higher B4C content (3%). Comparisons with Ti-6Al-4V DMD walls revealed a substantial grain refinement on TMC's due to enhanced grain nucleation on TiB whiskers, even for low B4C contents. Last, mechanical investigations indicated an increase of 10-15% of Vickers hardness, and a constant 10% increase of Young modulus on a large temperature range (20-600 degrees C) for all B4C content. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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