Du Jingguang, Ren Yaojia, Liu Xinyan, Xu Feng, Wang Xiaoteng, Zhou Runhua, Baker Ian, Wu Hong
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China.
Farsoon Technologies, Changsha 410205, China.
Materials (Basel). 2023 Jul 7;16(13):4890. doi: 10.3390/ma16134890.
Based on the advantage of rapid net-shape fabrication, laser powder bed fusion (LPBF) is utilized to process BC-reinforced Ti composites. The effect of volumetric energy density () on the relative density, microstructural evolution, tensile properties and wear behaviors of BC-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/mm). The additive particulates BC 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 increases. Through the analysis of the tensile and wear tests, the sample at 61 J/mm 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 mm·Nm. The microstructural evolution in changes and the corresponding underlying strengthening mechanisms of LPBF-ed Ti + BC composites are conducted in detail.
基于快速净成形制造的优势，采用激光粉末床熔融（LPBF）工艺来加工BC增强Ti基复合材料。系统研究了体积能量密度（）对BC增强Ti基复合材料的相对密度、微观结构演变、拉伸性能和磨损行为的影响。可以获得具有高相对密度（>99%）的LPBF加工样品，然而由于低能量输入（33 J/mm），在样品中可以观察到孔隙和未熔化的粉末。添加的颗粒状BC转变为纳米级的针状TiB晶须，而C溶解在Ti基体中。可以获得具有随机晶体取向的细晶尺寸（<10μm），并且随着的增加残余应力呈下降趋势。通过对拉伸和磨损试验的分析，61 J/mm的样品表现出良好的强度和耐磨性能组合，其极限抗拉强度为951 MPa，磨损率为3.91×10 mm·Nm。详细研究了LPBF加工的Ti + BC复合材料中微观结构的变化及其相应的潜在强化机制。
