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中南大学学报(英文版)

Journal of Central South University

Vol. 28    No. 4    April 2021

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Effects of tantalum addition on microstructure and properties of titanium alloy fabricated by laser powder bed fusion
ZHOU Li-bo(周立波)1, SHU Jing-guo(舒京国)1, SUN Jin-shan(孙金山)1, CHEN Jian(陈荐)1, HE Jian-jun(何建军)1, LI Wei(李微)1, HUANG Wei-ying(黄伟颖)1, NIU Yan(牛焱)1, YUAN Tie-chui(袁铁锤)2

1. Institute of Energy and Powder Engineering, Changsha University of Science and Technology,
Changsha 410114, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Abstract:The expanding of material library of laser powder bed fusion (L-PBF) is of great significance to the development of material science. In this study, the biomedical Ti-13Nb-13Zr powder was mixed with the tantalum particles (2 wt%-8 wt%) and fabricated by L-PBF. The microstructure consists of a β matrix with partially unmelted pure tantalum distributed along the boundaries of molten pool owing to the Marangoni convention. Because the melting process of Ta absorbs lots of energy, the size of molten pool becomes smaller with the increase of Ta content. The fine microstructure exists in the center of melt pool while coarse microstructure is on the boundaries of melt pool because of the existence of heat-affected zone. The columnar-to-equiaxed transitions (CETs) happen in the zones near the unmelted Ta, and the low lattice mismatch induced by solid Ta phase is responsible for this phenomenon. The recrystallization texture is strengthened while the fiber texture is weakened when the tantalum content is increased. Due to the formation of refined martensite α′ grains during L-PBF, the compressive strengths of L-PBF-processed samples are higher than those fabricated by traditional processing technologies. The present research will provide an important reference for biomedical alloy design via L-PBF process in the future.

 

Key words: laser powder bed fusion; titanium alloys; tantalum; solidification microstructure; texture evolution

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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