Microstructure evolution and mechanical properties of TiB/Ti6Al4V composites based on selective laser melting

IF 0.9 4区材料科学 Q3 METALLURGY & METALLURGICAL ENGINEERING Journal of Mining and Metallurgy Section B-Metallurgy Pub Date : 2022-01-01 DOI:10.2298/jmmb220422025h

X. Huang, Y. Zhu, W. Huang, Shuchen Qin, L. Wang

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Abstract

In this paper, Ti6Al4V+3 wt.% TiB2 composite powder was used as a raw material to synthesize TiB whiskers in situ and prepare composites reinforced with TiB/Ti6Al4V whiskers by selective laser melting (SLM). The effects of process parameters on the properties of TiB/Ti6Al4V samples were systematically studied. The evolution of the microstructure, including the formation and regulation of whiskers, and the effects on mechanical properties were discussed. The results showed that during the SLM process, adjusting the energy density effectively inhibited cracking in the TiB/Ti6Al4V samples. The TiB2 particles acted as nucleation centers to significantly refine the grains during processing and reacted with elemental Ti to form a needle-like TiB network at the grain boundaries, which strengthened the whiskers. Additionally, TiB played a role in dispersion strengthening. Compared with Ti6Al4V, the microhardness of TiB/Ti6Al4V was 430.6?11.45 HV, an increase of 27.9%, and the wear volume of the sample was 0.85?10-3 mm3, a decrease of 62.64%.

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选择性激光熔化TiB/Ti6Al4V复合材料的组织演变及力学性能

本文以Ti6Al4V+ 3wt .% TiB2复合粉末为原料，原位合成TiB晶须，并采用选择性激光熔化法制备TiB/Ti6Al4V晶须增强复合材料。系统地研究了工艺参数对TiB/Ti6Al4V试样性能的影响。讨论了晶须组织的演变，包括晶须的形成和调控，以及对力学性能的影响。结果表明，在SLM过程中，调节能量密度可以有效抑制TiB/Ti6Al4V试样的开裂。在加工过程中，TiB2粒子作为晶核中心使晶粒细化，并与元素Ti反应，在晶界处形成针状TiB网络，增强了晶须的强度。此外，TiB在弥散强化中起作用。与Ti6Al4V相比，TiB/Ti6Al4V的显微硬度为430.6 ~ 11.45 HV，提高了27.9%，试样的磨损体积为0.85?10-3 mm3，减少62.64%。

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来源期刊

Journal of Mining and Metallurgy Section B-Metallurgy 工程技术-冶金工程

CiteScore

2.00

自引率

40.00%

发文量

审稿时长

2 months

期刊介绍： University of Belgrade, Technical Faculty in Bor, has been publishing the journal called Journal of Mining and Metallurgy since 1965 and in 1997 it was divided in two independent journals dealing with mining and metallurgy separately. Since 2009 Journal of Mining and Metallurgy, Section B: Metallurgy has been accepted in Science Citation Index Expanded. Journal of Mining and Metallurgy, Section B: Metallurgy presents an international medium for the publication of contributions on original research which reflect the new progresses in theory and practice of metallurgy. The Journal covers the latest research in all aspects of metallurgy including hydrometallurgy, pyrometallurgy, electrometallurgy, transport phenomena, process control, solidification, mechanical working, solid state reactions, materials processing, surface treatment and relationships among processing, structure, and properties of materials.