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Kang Y.,Western Titanium Technologies Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Ti3Al and TC11 alloys were joined by electron beam welding. The influence of welding current on microstructure and elements diffusion of the weld seam for Ti3Al/TC11 alloy were investigated. The results show that the microstructure coarsens and the difference of grain size decreases with welding current increasing, and the coarse β columnar grain is formed in the weld seam when the welding current increases to 25 mA. Although the welding current has a little effect on the alloying elements content in the weld, but it has a relatively significant effect on its uniformity, which is related to the microstructure morphology in the weld seam. With welding current increasing, the uniformity of alloying elements content in the weld seam become worse. Source


Zhu Y.,Northwestern Polytechnical University | Zeng W.,Northwestern Polytechnical University | Zhang F.,Northwestern Polytechnical University | Zhao Y.,Northwest Institute for Nonferrous Metal Research | And 2 more authors.
Materials Science and Engineering A | Year: 2012

It is well known that once plastic deformation reaches a certain limit, metal materials may undergo ductile fracture, which will affect the workability of engineering materials. The accurate prediction of a material ductile fracture is thus of practical importance in the optimization of processes and improvement of products. The knowledge of the strain paths at a critical fracture site of a deforming material is helpful to study the detailed mechanics in the workability. Therefore, an accurate determination of the critical fracture reduction is a prime requirement for proper design and control of any metalworking process. However, it is always a difficult problem on a hot deformation field. In this work, a new high-speed photography was proposed for capturing the initiation and propagation of ductile fracture of Ti40 alloy during hot compression. The results suggest that the high-speed photography technology can clearly display the nucleation site and propagation process of cracking, and thus is an excellent method to represent dynamically the hot-deformation fracture. Based on the Oh fracture criterion, a new hot-deformation fracture criterion, which considered the effect of temperature and strain rate, was built. Then, by combining the DEFORM-3D simulation software and FROTRAN language, hot workability of Ti40 titanium alloy in metalworking processes can be predicted which shows that the proposed prediction model can precisely predict the fracture initiation in the upsetting of Ti40 ingot. Even better, this model can be further applied for optimizing the canned upsetting and indicates that the canned forging is effective for avoiding the oxidation cracking. © 2012 Elsevier B.V. Source


Jiang H.-T.,University of Science and Technology Beijing | Ma Z.,University of Science and Technology Beijing | Cai Z.-X.,University of Science and Technology Beijing | Shu Y.,Western Titanium Technologies Co. | Kang Q.,University of Science and Technology Beijing
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2015

The texture and room-temperature formability of rolled Mg-1.5Zn alloys containing different contents of Ce were investigated by experiment. It is indicated that during the same hot rolling and annealing processes, Ce addition can effectively modify and weaken the texture. When 0.2wt% Ce is added, the Mg-1.5Zn alloy has excellent room-temperature formability, and its maximum texture intensity is only 2.20. This alloy exhibits the transverse direction split texture, whose basal pole is tilted by about ±35° from the normal direction toward the transverse direction. At room temperature, the Erichsen value reaches 5.46, and the ultimate elongation in the rolling direction is 23.2% with a low planar anisotropy value of 0.01.However, 0.5% and 0.9% Ce additions promote the formation of huge secondary phase particles, resulting in an increase in the intensity of the basal texture, a decrease in the Erichsen value, and deterioration in the room-temperature stretch formability. ©, 2015 All right reserved. Source


Zhu Y.,Northwestern Polytechnical University | Zeng W.,Northwestern Polytechnical University | Zhao Y.,Northwest Institute for Nonferrous Metal Research | Shu Y.,Western Titanium Technologies Co. | Zhang X.,Changan University
Materials Science and Engineering A | Year: 2012

Effects of the processing parameters on the flow stress behavior and the microstructural revolution are investigated in the hot compression of Ti40 alloy. The experimental results show that the flow softening occurring at high strain rate, is associated with deformation heating, flow instability, cracking and DRX, while that occurring at low strain rate is contributed to DR and DRX. Effects of processing parameters on microstructural revolution are analyzed. At low temperature (<950°C) and low reduction (<30%), DRX scarcely occurs, while oxidation cracking is grievous at the temperature of 1100°C. Moreover, the recrystallized grain size decreases with the increasing of strain rate. Furthermore, flow instability occurs at the reduction of 70% and strain rates of 1 and 10s -1. It indicates the complicate effects of processing parameters on microstructural revolution, and is helpful for the control of microstructure and optimization of processing parameters. © 2012 Elsevier B.V. Source


Xi B.,Xian University of Architecture and Technology | Ju J.,Northwest Institute for Nonferrous Metal Research | Wang J.,Xian University of Architecture and Technology | Shu Y.,Western Titanium Technologies Co. | And 2 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2014

The microstructure evolution and the effect of deformation condition during superplastic deformation behavior of TA15 alloy were investigated. The results showed that, from 850~950°C deformation temperature and 1×10-4~1×10-3 s-1 strain rate, TA15 alloy had the good superplastic deformation property. Under deformation condition of 900°C and 5.5×10-4 s-1, it had the biggest elongation of 803.3%. In the same strain-rate, the dimension of the α phase grains and the content of β phase increased with the tensile temperature increasing, the grains still retained in equiaxed state. At the same deformation temperature, the dimension of the α phase grains and the content of β phase increased with the strain-rate decreasing. Meanwhile, the deformation had a significant influence on the microstructure, different parts of the microstructure had a certain degree of coarsening, greater degree of deformation made coarsening more serious, along with α to β phase transform. During deformation, the hardening and the softening competed against each other, and performed the traditional steady-state superplastic flow characteristics. Source

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