Western Titanium Technologies Co.

Fengcheng, China

Western Titanium Technologies Co.

Fengcheng, China

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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.


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.,Chang'an 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.


Liu J.,Northwestern Polytechnical University | Zeng W.,Northwestern Polytechnical University | Shu Y.,Western Titanium Technologies Co. | Xie Y.,Western Titanium Technologies Co. | Yang J.,Western Titanium Technologies Co.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2016

Elevated-temperature flow behavior of TC4-DT titanium alloy was investigated by isothermal hot compression tests at strain rate from 0.01 to 10 s-1 and temperature of 1181~1341 K on Gleeble-3500 simulator. Three criterions including sensitive index of the strain rate (m-value), power dissipation factor (η-value) and flow instability (ξ-value) at different strains were analyzed by the principle of processing maps. As a result, the temperature at 1181~1341 K and strain rate of 0.01~0.79 s-1 is the optimum region in which dynamic recovery/dynamic recrystallization (DRV/DRX) occurs, and the corresponding power-dissipation efficiency is about 45%. The alloy exhibits flow instability regimes due to flow localization at higher strain rates (>1 s-1). Copyright © 2016, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.


Xi B.,Xi'an University of Architecture and Technology | Ju J.,Northwest Institute for Nonferrous Metal Research | Wang J.,Xi'an 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.


Yang Y.,Western Titanium Technologies Co. | Nan L.,Western Titanium Technologies Co. | Yang J.,Western Titanium Technologies Co.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012

To simplify the process and improve product efficiency of TA2 Titanium tubes with φ89 mm × 2 mm, the process optimization were conducted by re-designing the dimension of tube blank and decreasing the number of rolling passes. Optimized process was presented by checking extrusion ratio, rolling force and bearing capacity of rollers. Through process optimization, the materials losses were reduced by about 1%, and rolling pass was decreased by one pass. Meanwhile, the utilization ratio of equipments was increased, and the service life of the mould was improved. Finally, the productivity was increased by three times.


Wang R.,Western Titanium Technologies Co. | Huang X.,Western Titanium Technologies Co. | Fu W.,Western Titanium Technologies Co. | Dang P.,Western Titanium Technologies Co. | And 3 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

Based on production and research experience, the effects of oxygen content, cold deformation rate and heat treatment on the microstructure and properties of TA1 titanium sheets were investigated. The results indicate that the oxygen content, cold deformation rate and heat treatment process have a significant effect on microstructure and properties of the TA1 titanium sheets. The sheets with oxygen content of 0.07%-0.10% can meet the aircraft demands when rolled with the deformation rate of 30%-50% and annealed at 550-650 ℃ for 0.5-2 h with furnace cooling.


Huang Z.,Western Titanium Technologies Co. | Wu X.,Western Titanium Technologies Co. | Fu W.,Western Titanium Technologies Co.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2014

The effect of homogenization treatment on casting microstructure, microhardness and mechanical properties of the commercial magnesium alloy AZ31B DC casting slab was investigated in order to find the proper process of homogenization treatment. The results show that after homogenization, dendritic microstructure disappears, secondary phase partially solves and the microstructure of AZ31B magnesium alloy casting slab becomes more uniform, the microhardness and tensile strength decrease obviously, and meanwhile, the ductility of the slab improves greatly.


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.


Dang P.,Western titanium technologies Co. | Zhang X.W.,Western titanium technologies Co. | Wang Y.,Western titanium technologies Co. | Zhang Q.,Western titanium technologies Co. | Li C.L.,Western titanium technologies Co.
Advanced Materials Research | Year: 2014

The influence of annealing temperature on the microstructure, mechanical properties and corrosion resistant of cold rolling zirconium sheet were studied in the manuscript. The experimental results shown that the tensile strength and yield strength of zirconium sheet were decreased and the elongationwas raised with the raising of annealing temperature from 500°C to 580°C. The recrystallization are not happened in zirconium sheet at the annealing temperature of 500°C. Zirconium sheet complete recrystallized and the strength and elongation get a well match at the annealing temperature of 540°C. Zirconium sheet also complete recrystallized at the annealing temperature of 580°C but the crystalline grain has the tendency of growing. The annealing temperature has no effect on the corrosion resistant of zirconium sheet. © (2014) Trans Tech Publications, Switzerland.


Nan L.,Western Titanium Technologies Co. | Yang Y.,Western Titanium Technologies Co. | Qi Y.,Western Titanium Technologies Co. | Luo D.,Western Titanium Technologies Co. | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2013

By producing TA18 experimental tubes with different dimension, the effects of Q value, accumulated deformation rate and annealing temperature on the microstructure and mechanical properties of the finished tubes were studied. Results show that the tubes can be rolled successfully in two-roll mill without cracking in surface, when the deformation rate is under 55% and the Q value maintains 0.53~1.14. With the increase of the deformation rate, the strength of the experimental tubes rises gradually while the elongation falls. However, the influence of the minor deformation rate on the elongation is very limited. In addition, the strength of the experimental tubes decreases and the elongation improves with the increase of the annealing temperature. Meanwhile, the work-hardening effect is diminished gradually. It is also found that the recrystallized grain size distribution of the experimental tubes would be non-homogeneous if the deformation rate is too low, which can result in the decrease of the elongation of the tubes annealed. After the process optimizing, the mechanical properties of TA18 experimental tubes can reach UTS=920 MPa, YS=755 MPa and El=14%. Copyright © 2013, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

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