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Effects of pretreatment and HVOF sprayed cermet coating on fatigue properties of tc21 titanium alloy

Science China(Technological Sciences) 2013年第5期56卷 1029-1037页

作者： DU DongXing LIU DaoXin MENG BaoLi ZHANG XiaoHua College of Aeronautics Institute of Corrosion and ProtectionNorthwestern Polytechnical University Xi'an Aircraft International Corporation

The effects of grit blasting (GB),shot peening (SP) pretreatment and high velocity oxygen fuel(HVOF) sprayed WC-17Co cermet coating on the fatigue properties of the novel ultra-high strength tc21 titanium alloy were investigated with a rotating bending fatigue test *** basic properties and surface integrity of the coating were investigated by using X-ray diffraction (XRD),surface roughness meter,microscopic hardness tester,scanning electron microscopy (SEM) and X-ray stress test *** results showed that the residual compressive stress could be introduced into the surface of tc21 alloy by GB and SP pretreatment,and that HVOF sprayed WC-17Co coating was compactly bonded with tc21 alloy substrate and it significantly improved the surface hardness of the ***,there was a certain residual tensile stress in the sublayer of the *** could significantly increase fatigue resistance of tc21 alloy due to the surface residual compressive *** was no significant effect on fatigue resistance by GB treatment due to the offset between the influence of surface residual compressive stress and the surface notch *** fatigue resistance of tc21 alloy was significantly reduced by HVOF WC-17Co coating prepared with GB *** could be attributed to the relaxation of surface residual compressive stress during the HVOF heating process,pore defects and residual tensile stress distribution in the WC-17Co coating with low toughness,and the surface notch induced by *** fatigue resistance of tc21 alloy was slightly reduced by HVOF WC-17Co coating prepared with SP *** was attributed to the offset between the advantage effect by SP and disadvantageous effect of WC-17Co coating and high temperature factor during the HVOF process.

关键词： tc21 titanium alloy HVOF grit blasting shot peening cermet coating WC-17Co fatigue properties

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Hydrogen absorption characteristics and microstructural evolution of tc21 titanium alloy

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Transactions of Nonferrous Metals Society of China 2016年第2期26卷 599-606页

作者：袁宝国郑育彬王玉洁龚龙清合肥工业大学材料科学与工程学院合肥230009

The hydrogen absorption characteristics and microstructural evolution of tc21 titanium alloy were investigated by kinetic model analysis, optical microscopy （OM） and X-ray diffraction （XRD）. The results show that the hydrogen absorption reaction occurred during the hydrogen absorption process of tc21 titanium alloy can be divided into two different stages according to the hydrogen absorption kinetics. After hydrogenation, the microstructure of tc21 titanium alloy changes obviously. Just a little hydrogen will change the contrast of transformedβphase. The contrast ofα phase darkens when the hydrogen content in tc21 titanium alloy exceeds 0.5% （mass fraction）. The phase/grain boundaries become ambiguous or even vanished, andβ phase becomes the main phase instead ofα phase when the hydrogen content reaches 0.625%. Moreover,α phase disappears when the hydrogen content reaches 1.065%. Additionally, the XRD analysis shows that α＇ martensite and FCCδ hydride appear in the hydrogenated alloy. According to the microstructures and XRD analysis, the schematic diagrams of hydrogen diffusion process in tc21 titanium alloy were established.

关键词： tc21 titanium alloy hydrogen absorption characteristics kinetics microstructure diffusion

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Static globularization and grain morphology evolution ofαandβphases during annealing of hot-rolled tc21 titanium alloy

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Transactions of Nonferrous Metals Society of China 2021年第9期31卷 2664-2676页

作者： Ke WANG Ming-yu WU Zhao REN Yu ZHANG Ren-long XIN Qing LIU International Joint Laboratory for Light alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

A lamellar-structure tc21 titanium alloy was hot-rolled and subsequently annealed at 820,880 and 940℃ for 1 and 6 h,and the effects of annealing parameters on static globularization and morphology evolution of bothαandβphases were *** results show thatαglobularization process is sluggish due to the limited boundary splitting at 820℃.With increasing temperature to 880℃,the accelerated boundary splitting and termination migration promote theα*** 820 and 880℃,the static recovery(SRV)and recrystallization(SRX)induce the grain refinement of interlamellarβ***,the excessively high temperature of 940℃ results in the coarsening ofαgrains due to the assistance of Ostwald ripening,and produces coarseβgrains mainly due to the absence of SRX in interlamellarβ***,880℃ is an appropriate annealing temperature to produce a homogeneous microstructure in which globularizedαand refinedβgrains distribute homogeneously.

关键词： tc21 titanium alloy αglobularization recrystallization grain refinement

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Microstructures and interfacial quality of diffusion bonded tc21 titanium alloy joints

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Transactions of Nonferrous Metals Society of China 2011年第1期21卷 58-64页

作者：刘会杰冯秀丽哈尔滨工业大学现代焊接生产技术国家重点实验室哈尔滨150001

Diffusion bonding of tc21 titanium alloy was carried out at temperature ranging from 780 ℃ to 980 ℃ for 5-90 *** interfacial bonding ratio,deformation ratio,microstructures and microhardness of the diffusion bonded joints were *** show that joints with high bonding quality can be obtained when bonded at 880 ℃ for 15？30 *** microhardness increases with increasing the bonding temperature,while it has a peak value（HV367） when bonding time is prolonged up to 90 *** equiaxed microstructures,bi-modal microstructures and fully lamellar microstructures were observed when bonded in temperature range of 780-880 ℃,at 930 ℃ or 980 ℃,*** volume fraction of α phase first increases and achieves the maximum when bonded at 880 ℃ for 60 min,and then descended.

关键词： tc21 titanium alloy diffusion bonding microstructure interfacial quality

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Microstructure and mechanical properties of tc21 titanium alloy by near-isothermal forging

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Transactions of Nonferrous Metals Society of China 2015年第1期25卷 72-79页

作者：石志峰郭鸿镇刘瑞王晓晨姚泽坤西北工业大学材料学院西安710072 西北工业大学航空学院西安710072

Microstructure and tensile properties of tc21 titanium alloy after near-isothermal forging with different parameters plus solution treatment and aging were investigated. It is found that the residual β matrix, which was strengthened by fine secondary α platelets forming during aging, exists in all the samples; while primary equiaxed α phase, bent lamellar α phase and α plates are simultaneously or individually present in one sample. The strength of alloy increases proportionally with increasing the content of residual β matrix, which is the result of increasing α/β interphase boundary. The plasticity of alloy has a downward trend as the content of residual β matrix increases. This attributes to the increase of fine secondary α platelets, which are cut by dislocations during the deformation. Additionally, coarse α plates with long axis parallel to the maximum resolved shear stress（MRSS） also reduce the plasticity of tc21 alloy.

关键词： tc21 titanium alloy near-isothermal forging microstructure α phase morphology residual β matrix tensile properties

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Microstructure and mechanical properties of tc21 titanium alloy after heat treatment

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Transactions of Nonferrous Metals Society of China 2013年第10期23卷 2882-2889页

作者：石志峰郭鸿镇韩锦阳姚泽坤西北工业大学材料学院西安710072

Microstructure evolutions during different heat treatments and influence of microstmcture on mechanical properties of tc21 titanium alloy were investigated. The results indicate that the excellent mechanical properties can be obtained by adopting air cooling after forging followed by heat treatment of （900℃, 1 h, AC）＋（590 ℃, 4 h, AC）. Deformation in single β field produces pan-like prior fl grains, while annealing in single fl field produces equiaxed prior fl grains. Cooling rate after forging or annealing in single fl field and the subsequent annealing on the top of α＋β field determine the content and morphology of coarse a plates. During aging or the third annealing, fine secondary a plates precipitate. Both ultimate strength and yield strength decrease with the content increase of coarse a plates. Decreasing effective slip length and high crack propagation resistance increase the plasticity. The crisscross coarse a plates with large thickness are helpful to enhance the fracture toughness.

关键词： tc21 titanium alloy heat treatment microstructure mechanical properties

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Effect of Initial Microstructure on Phase Precipitation and Mechanical Properties during Heat Treatment of tc21 titanium alloy

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Engineering（科研） 2020年第10期12卷 781-789页

作者： Liuru Wang Xiangqian Song Yue Zhang Lian Zhou School of Shipping and Mechatronic Engineering Taizhou University Taizhou China School of Intelligent Manufacture Taizhou Institute of Sci. & Tech. NJUST. Taizhou China Northwest Institute for Nonferrous Metal Research Xi’an China

Phase precipitation and mechanical properties of tc21 titanium alloy with two different initial microstructures during heat treatment were determined. Result indicated that compared with coarse microstructure alloy, fine microstructure alloy developed finer microstructure, more unstable ω and α2 precipitates with much smaller size and lower volume fraction, and obtained better mechanical properties during heat treatment.

关键词： tc21 titanium alloy Fine Microstructure Mechanical Properties Phase Precipitation

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Effect of cold deformation and heat treatment on microstructure and mechanical properties of tc21 Ti alloy

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Transactions of Nonferrous Metals Society of China 2020年第5期30卷 1290-1299页

作者： Ramadan N.ELSHAER Khaled M.IBRAHIM Mechanical Engineering Department Tabbin Institute for Metallurgical Studies(TIMS)11918CairoEgypt Casting Technology Department Central Metallurgical R&D Institute(CMRDI)11918CairoEgypt

In the present research work on tc21 titanium alloy(6.5 Al-3 Mo-1.9 Nb-2.2 Sn-2.2 Zr-1.5 Cr), the effects of cold deformation, solution treatment with different cooling rates and then aging on microstructure, hardness and wear property were investigated. A cold deformation at room temperature with 15% reduction in height was applied on annealed samples. The samples were solution-treated at 920 ℃ for 15 min followed by different cooling rates of water quenching(WQ), air cooling(AC) and furnace cooling(FC) to room temperature. Finally, the samples were aged at 590 ℃ for 4 h. Secondary α-platelets precipitated in residual β-phase in the case of solution-treated samples with AC condition and aged ones. The maximum hardness of HV 470 was obtained for WQ + aging condition due to the presence of high amount of residual β-matrix(69%), while the minimum hardness of HV 328 was reported for FC condition. Aging process after solution treatment can considerably enhance the wear property and this enhancement can reach up to about 122% by applying aging after WQ compared with the annealed samples.

关键词： tc21 titanium alloy deformation heat treatment cooling rate microstructure mechanical properties wear

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