The Effect of Energy Density and Nb Content on the Microstructure and Mechanical Properties of Selective Laser Melted Ti-(10-30 wt.%) Nb
The Effect of Energy Density and Nb Content on the Microstructure and Mechanical Properties of Selective Laser Melted Ti-(10-30 wt.%) Nb
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DOI：
10.1007/s11665-021-06239-5
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发表时间：
2021-09
影响因子：
2.3
通讯作者：
J. Borgman;Jing Wang;L. Zani;P. Conway;C. Torres-Sánchez
中科院分区：
文献类型：
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作者：
J. Borgman;Jing Wang;L. Zani;P. Conway;C. Torres-Sánchez
本研究采用选择性激光熔凝(SLM)工艺制备了以元素粉末为原料的Ti-(0-30wt.%)Nb合金。研究了成分均匀度、显微组织和力学性能随能量密度的变化规律。未熔化的Nb颗粒所占比例和孤立孔数随着能量密度的增加而减少，而由于原位合金化，钛的同质异向含量(即α‘，α“和β)随着能量密度的增加而变化。随着Nb含量的增加，α“和β相趋于稳定。力学性能与使用铸造方法制造的组合物相似，不需要进一步的后处理。在能量密度为230J/mm~3的条件下，添加20Nb(wt.%)，得到的杨氏模数为65.2±1.8 Gpa，屈服强度为76 9±36 Mpa，显微组织为以α马氏体为主。这一强度比(比Ti-10Nb高33%，比Ti-30Nb高22%)归因于促进固溶强化和均化的原位合金化。这些合金是很有竞争力的材料，适用于植入性承重矫形应用。
In this study, Ti-(0-30 wt.%)Nb alloys developed from elemental powders were fabricated by the Selective Laser Melting (SLM) process. Compositional homogeneity, microstructure and mechanical performance were investigated as a function of energy density. The proportion of un-melted Nb particles and isolated pore count reduced with increasing energy density, while Ti allotropic content (i.e.α’,α” andβ) varied with energy density due to in-situ alloying. Increasing the Nb content led to the stabilisation of theα” andβphases. The mechanical properties were similar to those compositions manufactured using casting methods, without further post processing. The addition of 20Nb (wt.%) and using an energy density of 230 J/mm3resulted in a Young’s Modulus of 65.2 ± 1.8 GPa, a yield strength of 769 ± 36 MPa and a microstructure of predominantlyα” martensite. This strength to stiffness ratio (33% higher than Ti-10Nb and 22% higher than Ti-30Nb), is attributed to in-situ alloying that promotes solid solution strengthening and homogenisation. These alloys are strong contenders as materials suitable for implantable load-bearing orthopaedic applications.