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Microstructure and mechanical properties of laser additive repaired ti17 titanium alloy

Transactions of Nonferrous Metals Society of China 2017年第12期27卷 2613-2621页

作者： Zhuang ZHAO Jing CHEN Qiang ZHANG Hua TAN Xin LIN Wei-dong HUANG State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi’an 710072 China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design Ministry of Industry and Information Technology Northwestern Polytechnical University Xi’an 710072 China

Laser additive manufacturing technology with powder feeding was employed to repair wrought ti17titanium alloy with small surface *** microstructure,micro-hardness and room temperature tensile properties of laser additive repaired(LARed)specimen were *** results show that,cellular substructures are observed in the laser deposited zone(LDZ),rather than the typicalαlaths morphology due to lack of enough subsequent thermal *** cellular substructures lead to lower micro-hardness in the LDZ compared with the wrought substrate zone which consists of duplex *** tensile test results indicate that the tensile deformation process of the LARed specimen exhibits a characteristic of dramatic plastic strain heterogeneity and fracture in the laser repaired zone with a mixed dimple and cleavage *** tensile strength of the LARed specimen is slightly higher than that of the wrought specimen and the elongation of11.7%is lower.

关键词： laser additive repair ti17 titanium alloy microstructure mechanical properties deformation behavior

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Multi-scale analyses of phase transformation mechanisms and hardness in linear friction welded ti17(a+β)/ti17(β)dissimilar titanium alloy joint

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Chinese Journal of Aeronautics 2024年第1期37卷 312-324页

作者： Zhenguo GUO tiejun MA Xiawei YANG Ju LI Wenya LI Achilles VAIRIS State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesNorthwestern Polytechnical UniversityXi’an 710072China Aeronautical Key Laboratory for Welding and Joining Technologies AVIC Manufacturing Technology InstituteBeijing 100024China Mechanical Engineering Department University of West AtticaAthens 12241Greece

The ti17(a+β)-ti17(β)dual alloy-dual property blisk produced using Linear Friction Welding(LFW)is considered as high-performance component in advanced ***,up to now,microstructure evolution and relationship between microstructure and micro mechanical properties of LFWed ti17(a+β)/ti17(β)dissimilar joint have not been thoroughly *** 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 *** reveal that a dissolution occurs under high temperatures encountered during LFW,which reduces microhardness of the joint to that of ti17(a+β)and ti17(β).In ThermoMechanically Affected Zone of ti17(a+β)(TMAZ-(a+β))side joint,a large number of nanocrystalline a phases form with different *** microstructure strengthens significantly by fine grains which balances partial softening effect of a dissolution,and increases nanohardness of a phase and microhardness of TMAZ-(a+β).Superlattice metastableβphase precipitates from metastableβin Weld Zone(WZ)during quick cooling following welding,because of short-range diffusion migration of solute atoms,especiallyβstabilizing elements Mo and *** precipitation of the superlattice metastableβphase results in precipitation strengthening,which in turn increases nanohardness of metastableβand microhardness in WZ.

关键词： Linear friction welding ti17 titanium alloy Phase transformation Microhardness Nanohardness

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