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Title: Microstructural evolution, mechanical properties and tribological behavior of B₄C-reinforced Ti in situ composites produced by laser powder bed fusion
Authors: Du, Jingguang
Ren, Yaojia
Liu, Xinyan
Xu, Feng
Wang, Xiaoteng
Zhou, Runhua
Baker, Ian
Wu, Hong
Keywords: Engineering::Mechanical engineering
Issue Date: 2023
Source: Du, J., Ren, Y., Liu, X., Xu, F., Wang, X., Zhou, R., Baker, I. & Wu, H. (2023). Microstructural evolution, mechanical properties and tribological behavior of B₄C-reinforced Ti in situ composites produced by laser powder bed fusion. Materials, 16(13), 4890-.
Journal: Materials 
Abstract: Based on the advantage of rapid net-shape fabrication, laser powder bed fusion (LPBF) is utilized to process B4C-reinforced Ti composites. The effect of volumetric energy density (VED) on the relative density, microstructural evolution, tensile properties and wear behaviors of B4C-reinforced Ti composites were systematically investigated. The LPBF-ed samples with high relative density (>99%) can be achieved, while the pores and un-melted powders can be observed in the sample owing to the low energy input (33 J/mm3). The additive particulates B4C were transformed into needle-like TiB whiskers with nano-scale while C dissolved in the Ti matrix. Fine-scale grains (<10 μm) with random crystallographic orientation can be achieved and the residual stress shows a downtrend as the VED increases. Through the analysis of the tensile and wear tests, the sample at 61 J/mm3 VED showed a good combination of strength and wear performance, with an ultimate tensile strength of 951 MPa and a wear rate of 3.91 × 10-4 mm3·N-1m-1. The microstructural evolution in VED changes and the corresponding underlying strengthening mechanisms of LPBF-ed Ti + B4C composites are conducted in detail.
ISSN: 1996-1944
DOI: 10.3390/ma16134890
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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