Microstructure Evolution and High Strength-Ductility Synergy of Ti-13Nb-13Zr-2Ta Alloy Fabricated by Laser Powder Bed Fusion

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-09-29 DOI:10.1007/s40195-024-01763-4

Libo Zhou, Biao Peng, Jian Chen, Yanjie Ren, Yan Niu, Wei Qiu, Jianzhong Tang, Zhou Li, Wei Chen, Weiying Huang, Cong Li

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引用次数: 0

Abstract

This work systematically investigates the densification, microstructure evolution and the attainment of high strength-ductility in Ti-13Nb-13Zr-2Ta alloy processed by laser powder bed fusion (LPBF). A narrow and viable process window (P_{laser power} = 175 W, v_{scanning speed} = 1000 mm/s, h_{scanning distance} = 0.1 mm and d_{layer thickness} = 0.03 mm) was accordingly determined and the relative density of Ti-13Nb-13Zr-2Ta alloy reaches 99.76%. The depth of molten pool increases gradually with the increase of energy density, and the relationship between the depth of molten pool and energy density has been quantitatively described. Three types of α′ martensites with average grain width less than 3 μm can be observed in the LPBF-fabricated Ti-13Nb-13Zr-2Ta alloys, attributed to the significantly high cooling rate and remelting process. The fine grain size, high density dislocations, nanotwins, ordered oxygen complexes and α + α″ heterostructure all contributed to the high strength (1037.75 ± 25.18 MPa) and ductility (20.32% ± 1.39%) of LPBF-fabricated Ti-13Nb-13Zr-2Ta alloy in this work.

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激光粉末床熔融技术制造的 Ti-13Nb-13Zr-2Ta 合金的微观结构演变和高强度-延展性协同作用

这项工作系统地研究了通过激光粉末床熔融（LPBF）工艺加工的 Ti-13Nb-13Zr-2Ta 合金的致密化、微观结构演变和高强度-电导率的实现。据此确定了一个狭窄可行的工艺窗口（激光器功率 = 175 W，扫描速度 = 1000 mm/s，扫描距离 = 0.1 mm，层厚 = 0.03 mm），Ti-13Nb-13Zr-2Ta 合金的相对密度达到 99.76%。熔池深度随能量密度的增加而逐渐增大，熔池深度与能量密度的关系得到了定量描述。在 LPBF 制备的 Ti-13Nb-13Zr-2Ta 合金中，可以观察到平均晶粒宽度小于 3 μm 的三种类型的 α′ 马氏体，这归因于显著较高的冷却速率和重熔过程。细晶粒尺寸、高密度位错、纳米丝、有序氧复合物和α + α″异质结构都有助于 LPBF 制备的 Ti-13Nb-13Zr-2Ta 合金获得高强度（1037.75 ± 25.18 MPa）和延展性（20.32% ± 1.39%）。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.