首页|Effect of grain boundary Widmanst?tten α colony on the anisotropic tensile properties of directed energy deposited Ti-6Al-4V alloy

Effect of grain boundary Widmanst?tten α colony on the anisotropic tensile properties of directed energy deposited Ti-6Al-4V alloy

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Columnar grain structure caused anisotropy in mechanical properties,especially in elongation,is an im-portant concern for Ti-6Al-4 V alloy fabricated by directed energy deposition(DED).Several strategies have been proposed to reduce anisotropy by globularizing the grains,but these conventional approaches are costly and inefficient due to challenges faced during producing the columnar β-grain structures.How-ever,understanding the impact of columnar grain-related microstructures on the anisotropic deformation behavior is still necessary.Despite the recognition of the importance of grain boundary Widmannstättenα colony(αWGB)as a grain-related microstructure,it has received limited attention in available literature on anisotropy in mechanical properties.This study employed in-situ induction heating during DED to control αWGB formation,yielding three Ti-6Al-4 V samples with varying αWGB sizes.Anisotropic deforma-tion of αWGB and its impact on elongation in build and transverse directions were analyzed.αWGB width grew from 0.5 μm to 32.4 μm via diffusion-controlled growth due to reduced cooling rate.Transverse deformation led to dislocation movement and accumulation,causing early failure and worsened ductile anisotropy within αWGB.Notably,larger αWGB size significantly exacerbated anisotropy in ductility.This work underscores αWGB's role in anisotropic deformation and offers insights for optimizing mechanical properties in DED-fabricated titanium alloys.

Additive manufacturingDirected energy depositionAnisotropic mechanical propertiesTitanium alloyMicrostructure

Wei Fan、Yijie Peng、Yongxia Wang、Yang Qi、Zhe Feng、Hua Tan、Fengying Zhang、Xin Lin

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State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China

Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design,MIIT China,Northwestern Polytechnical University,Xi'an 710072,China

Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China

School of Material Science and Engineering,Chang'an University,Xi'an 710064,China

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National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaND Basic Research FundsShenzhen Science and Technology Plan ProjectKey Research and Development Program of ShaanxiScience and Technology Plan of Xi'an City

2022YFB46003002022YFB460030152175364G2022WDJCYJ201805081519036462023-YBGY-35921ZCZZHXJS-QCY6-0001

2024

10.1016/j.jmst.2023.09.057

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.184(17)
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