Tailoring the microstructure and mechanical properties of wire arc additively manufactured Ti6Al4V alloy by in-situ microalloying with modified nanocarbon

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-11-01 DOI:10.1016/j.matchar.2024.114510

Z.W. Yang, C.L. Shi, X.Z. Yao, H.J. Li, Z.Q. Ma, Y. Wang

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Abstract

Carbon alloying is a validated strategy for enhancing the mechanical properties of titanium alloys prepared by wire arc additive manufacturing (WAAM). However, achieving uniform carbon distribution, particularly nanocarbon, in the melt pool via the brushing method is challenging, which limits the improvement of mechanical properties. In this paper, nanocarbon was modified by nitric acid hydrothermal treatment and added into the Ti64 melt pool during the WAAM. The distribution of modified nanocarbon in the melt pool was characterized, and the microstructure and mechanical properties of the nanocarbon-alloyed titanium alloy deposits were studied. The findings revealed that the surface of modified nanocarbon generated oxygen-containing functional groups, which enhanced its dispersion in the melt pool. The addition of 0.1–0.3 wt% modified nanocarbon induced no pores in the deposits compared to unmodified ones. The tensile strength of the deposited alloys was continually enhanced with increasing modified nanocarbon content, while the elongation had a peak value. The Ti64 with 0.1 wt% nanocarbon exhibited a balanced comprehensive performance with an ultimate tensile strength (UTS) of 981 MPa coupled with an elongation of 8 %. The achievement of the balanced mechanical performances was attributed to the refinement of α-Ti and solid solution strengthening of nanocarbon. When 0.3 wt% nanocarbon was added, the UTS increased to 1012 MPa but the elongation sharply decreased to 4.5 % due to the precipitation of TiC.

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利用改性纳米碳原位微合金化技术定制线弧快速成型 Ti6Al4V 合金的微观结构和机械性能

碳合金化是提高线弧快速成型（WAAM）制备的钛合金机械性能的有效策略。然而，通过刷涂方法在熔池中实现碳（尤其是纳米碳）的均匀分布具有挑战性，这限制了机械性能的改善。本文通过硝酸水热处理对纳米碳进行改性，并在 WAAM 过程中将其添加到 Ti64 熔池中。对改性纳米碳在熔池中的分布进行了表征，并研究了纳米碳合金钛合金沉积物的微观结构和力学性能。研究结果表明，改性纳米碳表面产生的含氧官能团增强了其在熔池中的分散性。与未改性纳米碳相比，添加 0.1-0.3 wt%的改性纳米碳不会在沉积物中产生气孔。随着改性纳米碳含量的增加，沉积合金的拉伸强度不断提高，而伸长率则达到一个峰值。纳米碳含量为 0.1 wt% 的 Ti64 具有均衡的综合性能，极限拉伸强度 (UTS) 为 981 MPa，伸长率为 8%。均衡机械性能的实现归功于α-钛的细化和纳米碳的固溶强化。当添加 0.3 wt% 的纳米碳时，UTS 增加到 1012 MPa，但由于 TiC 的析出，伸长率急剧下降到 4.5 %。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.