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globularization Mechanism and Near Isotropic Properties in Subcritical Heat‑Treated Ti6Al4V Fabricated by Directed Energy Deposition

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Acta Metallurgica Sinica(English Letters) 2023年第6期36卷 937-948页

作者： Guohao Zhang Zhiwei Hao Meng Wang Xufei Lu Zhuang Zhao Qian Wang Xin Lin Jing Chen Weidong Huang State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design Northwestern Polytechnical UniversityXi’an 710072China International Center for Numerical Methods in Engineering Universidad Politecnica de Cataluna08034 BarcelonaSpain Institute of Machinery Manufacturing Technology China Academy of Engineering PhysicsMianyang 621054China

Microstructure with globularαphase is desirable as it contributes to preferable comprehensive mechanical properties for titanium ***,titanium alloys fabricated by directed energy deposition(DED)are mainly characterized by the lamellarαphase within the basket-weave microstructure,which often leads to severe anisotropy and inferior low cycle fatigue(LCF)*** address this,the subcritical annealing and the cyclic annealing were applied to DED Ti–6Al–4V in order to achieve the transformation from the lamellarαphase to the globularα*** microstructural characteristics and the globularization behavior ofαphase during heat treatment were *** results show that the aspect ratio ofαis significantly decreased with the subcritical annealing due to the coarsening of lamellarα.Furthermore,the globularαis obtained with the cyclic annealing as a combination result of the termination dissolution and the side surface growth of the lamellarα.These contribute to a pronounced reduction of 85.4%in the ductility anisotropy,compared with the as-built specimens,and superior comprehensive mechanical properties including LCF are achieved with the formation of globularα.

关键词： Directed energy deposition Ti-6Al-4V Subcritical heat treatment Coarsening globularization

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Evolution mechanism of lamellarαand interlayeredβduring hot compression of TC21 titanium alloy with a widmanst?tten structure

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Chinese Journal of Aeronautics 2022年第3期35卷 475-483页

作者： Xiaoyu ZHENG Ke WANG Cheng ZHANG Renlong XIN Qing LIU International Joint Laboratory for Light Alloys(MOE) School of Materials Science and EngineeringChongqing UniversityChongqing 400044China

TC21 titanium alloy,as an important metal to fabricate the aircraft structural components,has attracted great attentions recently.A TC21 titanium alloy with widmanst?tten structure was isothermally *** on the microstructure observation,the evolution of initialβgrain,Grain Boundaryαphase(α;),lamellar a and interlayeredβwas systematically *** results showed that,with the increasing of height reduction,theα;underwent an evolution process from bending/kinking to breaking inducing the corresponding blurring of initial coarse b grain ***,a significant phase transformation from a to b took place at the terminations of brokenα;.The evolution of lamellarαand interlayeredβin the colony was closely related to their deformation *** the a colony,the interlayered b experienced a larger deformation amount than lamellarα.The higher distortion energy promoted the occurrence of Dynamic Recovery(DRV)and Dynamic Recrystallization(DRX)to generate many Low Angle Boundaries(LABs)and High Angle Boundaries(HABs)in interlayered b,which induced an apparent grain refinement of b *** the contrary,the lower distortion energy and low deformation temperature suppressed the occurrence of DRV/DRX and restrained the globularization of lamellarα.Furthermore,the microstructure observation clearly revealed that the shearing separation mechanism dominated the evolution of the a phase from lamellar to short bar-like morphology.

关键词： globularization Grain refinement Hot deformation Interlayeredβ Lamellarα Titanium alloy

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Warm deformation behavior of Ti-6Al-4V alloy at strain rate of 100s-1

Warm deformation behavior of Ti-6Al-4V alloy at strain rate ...

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2012年海峡两岸破坏科学/材料试验学术会议

作者： Zheng Wei-Wei Liu Peng Sha Ai-Xue State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing Institute of Aeronautical Materials

TC4 alloys with equiaxed and Widmanstatten initial microstructures were conducted in compression at 700-800℃in a strain rate of *** oscillations are observed regardless of the initial *** equiaxed initial structure continuous DRX of a grains is the main softening mechanism,and the degree of continuous DRX is scarcely influenced by the *** lamellar initial structure the dominant softening mechanism changes with the *** degree of a globularization increases with increasing *** microstructure can be refined effectively by the combination of continuous DRX and dynamic globularization of a grains(or plates).

关键词： TC4 Equiaxed Lamellar Warm Deformation Continuous Dynamic Recrystallization globularization Refine

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