首页|Tailoring bimodal structure for high strength and ductility in pure titanium manufactured via laser powder bed fusion
Tailoring bimodal structure for high strength and ductility in pure titanium manufactured via laser powder bed fusion
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NSTL
Elsevier
Laser-powder bed fusion (L-PBF) is being increasingly employed in the fabrication of commercially pure titanium (CP-Ti) components for biomedical applications. However, L-PBF-manufactured CP-Ti parts typically exhibit high strength and reduced ductility owing to the formation of acicular α′ martensite. It is essential to decompose the acicular α′ martensite into the equilibrium α phase through post-heat treatments to achieve superior mechanical properties. In this study, post-heat treatments were applied to L-PBF-fabricated CP-Ti Gr. 1?Gr. 4 samples. The microstructures of the as-fabricated CP-Ti samples were dominated by acicular α′ martensite, which exhibited high strength (>800 MPa) but low ductility (<20%). Full annealing resulted in the formation of equiaxed grains and the disappearance of the columnar structures in the CP-Ti samples. The equiaxed grains contributed to high ductility (>30%) in the Gr. 1 and Gr. 2 samples, but low ductility (<20%) in the Gr. 3 and Gr. 4 samples. This low ductility is associated with the formation of grain-boundary β layers. Well-designed partial annealing led to the formation of bimodal structures consisting of both equiaxed and fine lamellar grains. This specific structure provides both a high strength (>700 MPa for Gr. 2 and,>850 MPa for Gr. 4) and high ductility (>35% for Gr. 2 and Gr. 4), which are superior to those of the samples processed under full annealing conditions. Therefore, tailoring the bimodal structure in the L-PBF-manufactured CP-Ti for both high strength and ductility is promising for biomedical applications.
Bimodal structureHigh strength and ductilityLaser-powder bed fusionPost-heat treatmentPure titanium
Park C.H.、Yeom J.-T.、Wang C.-S.、Li C.-L.、Zhang G.-D.、Mei Q.、Zuo Y.-T.、Hong J.-K.、Choi S.-W.
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Advanced Metals Division Korea Institute of Materials Science
School of Power and Mechanical Engineering Wuhan University
Guohe general testing and evaluation Certification Co. Ltd
NSTL
Elsevier
