首页|Multi-scale analyses of phase transformation mechanisms and hardness in linear friction welded Ti17(α+β)/Ti17(β)dissimilar titanium alloy joint

Multi-scale analyses of phase transformation mechanisms and hardness in linear friction welded Ti17(α+β)/Ti17(β)dissimilar titanium alloy joint

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The Ti17(α+β)-Ti17(β)dual alloy-dual property blisk produced using Linear Friction Welding(LFW)is considered as high-performance component in advanced aeroengine.However,up to now,microstructure evolution and relationship between microstructure and micro mechanical properties of LFWed Ti17(α+β)/Ti17(β)dissimilar joint have not been thoroughly revealed.In this work,complex analyses of the phase transformation mechanisms of the joint are conducted,and phase transformations in individual zones are correlated to their microhardness and nanohard-ness.Results reveal that α dissolution occurs under high temperatures encountered during LFW,which reduces microhardness of the joint to that of Ti17(α+β)and Ti17(β).In Thermo-Mechanically Affected Zone of Ti17(α+β)(TMAZ-(α+β))side joint,a large number of nanocrystalline α phases form with different orientations.This microstructure strengthens signifi-cantly by fine grains which balances partial softening effect of α dissolution,and increases nanohardness of α phase and microhardness of TMAZ-(α+β).Superlattice metastable β phase precipitates from metastable β in Weld Zone(WZ)during quick cooling following welding,because of short-range diffusion migration of solute atoms,especially β stabilizing elements Mo and Cr.The precipitation of the superlattice metastable β phase results in precipitation strengthening,which in turn increases nanohardness of metastable β and microhardness in WZ.

Linear friction weldingTi17 titanium alloyPhase transformationMicrohardnessNanohardness

Zhenguo GUO、Tiejun MA、Xiawei YANG、Ju LI、Wenya LI、Achilles VAIRIS

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State Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Friction Welding Technologies,Northwestern Polytechnical University,Xi'an 710072,China

Aeronautical Key Laboratory for Welding and Joining Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China

Mechanical Engineering Department,University of West Attica,Athens 12241,Greece

National Science and Technology Major Project,ChinaNational Natural Science Foundation of ChinaState Key Laboratory of Solidification Processing,ChinaInnovation Foundation for Doctor Dissertation of Northwestern Polytechnical University,China

2017-Ⅶ-0005-0098521054002021-TS-07CX2023008

2024

10.1016/j.cja.2023.08.018

中国航空学报(英文版)
中国航空学会

中国航空学报(英文版)

CSTPCDEI
影响因子：0.847
ISSN：1000-9361
年,卷(期)：2024.37(1)
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