Baoji Titanium Industry Co.

Baoji, China

Baoji Titanium Industry Co.

Baoji, China
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Li M.,Baoji Titanium Industry Co. | Wang X.,Baoji Titanium Industry Co. | Feng Q.Y.,Baoji Titanium Industry Co. | Wang J.,Baoji Titanium Industry Co. | And 2 more authors.
Materials Characterization | Year: 2017

The effect of morphology of the long-period stacking ordered (LPSO) phase on mechanical properties of the Mg-7Gd-3Y-1Nd-1Zn-0.5Zr (wt.%) alloy have been studied. The results reveal that the block-like 14H-LPSO phases in and near grain boundaries can be formed during heat treatment at high temperature, but low temperatures is conducive to form the needle-like 14H-LPSO phases within α-Mg grains. During heat treatment at fixed temperature for different time, the preferential nucleation sites of the 14H-LPSO phases are located in grain boundaries, then the14H-LPSO phases grow into the α-Mg matrix in the form of needle-like, the needle-like 14H-LPSO phases gradually decrease its length after growing a certain stage, at last the needle-like 14H-LPSO phases disappear completely. The decomposition of the block-like 14H-LPSO phases is found during furnace cooling after homogenization. After decomposition of the block-like 14H-LPSO phases, the rapid diffusion of Zn atoms into α-Mg matrix leads to form the needle-like 14H-LPSO phases within α-Mg matrix, but the retention of RE atoms in grain boundaries results in forming the Mg-RE particles. After extrusion and subsequent ageing, it is found that the alloy with the needle-like 14H-LPSO phases exhibit superior elongation than the alloy without the needle-like 14H-LPSO phase. The precipitates of peak-aged alloys are studied by TEM. The <112−0>α demonstrates that the stacking faults can be observed, the serious lattice distortion appears near the stacking fault. The [0001] zone axis shows that the β′ and a new rod phase are found, and the enrichment of RE atoms are detected in the two phase by HADDF-STEM. It seems to be that the rod phase can be subdivided into a plurality of mutually parallel structure unit. © 2017 Elsevier Inc.

Song P.Y.,Kunming University of Science and Technology | Wang H.L.,Baoji Titanium Industry Co. | He P.C.,Kunming University of Science and Technology
Applied Mechanics and Materials | Year: 2014

The numerical simulation of a 3-D model of the internal flow field for a Vortex slurry pump has been analyzed in this paper. The impact of different solids volume fraction on the distribution of solid particle was analyzed. The expression of the pump head and efficiency was derived by the energy equation. The results show that either on the long blades or on the short blades, the content of the solid particles increases with the increasing of the volume fraction. The results by the expression of the pump head and efficiency are compared with the results of the simulations. The conclusions show that the expression results are similar with the numerical simulation results, and the main factors of affecting the inner and outer characteristics are the solid particles. © (2014) Trans Tech Publications, Switzerland.

He S.,Baoji Titanium Industry Co. | Ma Y.J.,CAS Shenyang Institute of Metal Research | Wang D.C.,Baoji Titanium Industry Co.
Ti 2011 - Proceedings of the 12th World Conference on Titanium | Year: 2012

Damage tolerance property of TA15 alloy with different microstructures was studied in this paper. The results show that, the alloys of unde- formed Widmanstatten with small patches, deformed Widmanstatten and net microstructure have higher fracture toughness and lower fatigue crack extending rate, while still maintain the performance of high plasticity and good damage-tolerance. The alloy with two state microstructure has good performance in plasticity,but bad damage-tolerance property.

Wang X.,Baoji Titanium Industry Co. | Liu J.,CAS Shenyang Institute of Metal Research | Lei J.,CAS Shenyang Institute of Metal Research
Ti 2011 - Proceedings of the 12th World Conference on Titanium | Year: 2012

The microstructure, tensile property, and damage tolerance property of the Ti-6Al-2Zr-2V-1. 5Mo ELI titanium alloy after two processes routines was investigated. The results showed that the microstructure after two processes was the bunched lamellar structure without primary α phase, and the α lamellar of bars after β forging was thicker, The high damage tolerance property could be achieved by one of these two processes routine Tensile strength and fracture toughness of the bars after β forging and double annealing at α+β dual phase zone were higher while the plasticity, dynamic: ductility and resistance of fatigue crack propagation of bars after α+β zone forging followed by β annealing were higher, It in dicated that the fracture toughness property increased and resistance of fatigue crack growth decreased with the increasing of thickness of α lamellar in the Ti-6Ai-2Zr-2V-1. 5Mo ELI titanium alloy.

Wang X.-X.,Baoti Group Co. | Wang W.-Q.,Baoji Titanium Industry Co. | Zhang Y.-Q.,Baoti Group Co.
Materials Science Forum | Year: 2013

The microstructures of the Alloy C+ with three different heat treatment processes have been investigated after exposure at 550 °C for 100 hours in this study. The alloy shows typical equiaxed β grains with second phase precipitation and twin formation inside the β grains in the as-rolled condition. Solution treatment at lower temperature led to a smaller β grain size while higher temperature solution treatment produced coarse grains with increasing precipitated phases inside the β grains. Ageing treatment after solution and thermal exposure for a long period of time resulted in an increasing α phase precipitation at the grain boundaries due to their tendency for preferential nucleation of second phases. In a certain condition, continuous coarsening of the α phase is concentrated on the grain boundaries therefore violate the properties of the alloy. © (2013) Trans Tech Publications, Switzerland.

Xin T.,Baoji Titanium Industry Co.
Ti 2011 - Proceedings of the 12th World Conference on Titanium | Year: 2012

To the technical problem of easy occurrence of missed test on deficiencies or of difficulty in evaluating films because of big blackness difference when performing l00% X-ray test on key places at crossing angles in T shaped titanium castings, this article describes how to choose the incidence angle at corner of T shaped titanium castings for X ray test, and how to calculate the radiographic thickness according to chosen incidence angle. Based on the work, this article determines the test sensitivity and the radiographic process parameters.

Wang Z.,Central South University | Xia C.,Central South University | Li X.,Central South University | Wang W.,Baoji Titanium Industry Co. | Ma H.,Baoji Titanium Industry Co.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2010

The phase transformation temperature was very important to titanium and its alloys. The phase transformation temperature was obtained by calculation method and differential scanning calorimetry(DSC) with the value of 1006 and 1002°C, respectively. The temperature range of continuous metallographic method was chosen according to the temperature obtained, and T(α+β)/β phase transformation temperature was in the range of 995~1005°C. Compared the above methods, the phase transformation temperature was 1000°C.

Bai Q.-L.,Xi'an Jiaotong University | Zhang L.-J.,Xi'an Jiaotong University | Xie M.-X.,China University of Technology | Yang H.-X.,Baoji Titanium Industry Co. | Zhang J.-X.,Xi'an Jiaotong University
International Journal of Advanced Manufacturing Technology | Year: 2016

Owing to excellent corrosion resistance, antifriction property, and economic efficiency, H62/Q235B explosive clad plates have been widely used in various fields. Therefore, detailed and systematic study into the microstructure and mechanical properties of this clad material is necessary. In this paper, the composition, microstructure, and mechanical properties of H62/Q235B explosive clad plates were analyzed by optical metallographic observation, mechanical tests, scanning electron microscope (SEM) observation, and energy dispersive spectrometer (EDS) analysis. The results showed that the bonding interface of this clad plate was periodical wavy, and the interface was bonded in two ways, one through wide transition layer with a width up to 280 μm while the other by narrow transition layer with a width less than 20 μm. The major structural components in the transition layer were supersaturated solid solutions. The microhardness of the transition layer was higher than that of base metals, and the microhardness of the base plates in the region near the bonding interface was affected by both force and heat. The shear strength of the H62/Q235B clad plate showed an obvious characteristic of anisotropy. Furthermore, the clad plate tended to crack along the transition layer when it was stretched because of the discontinuity of plastic deformation across H62/Q235B interface. © 2016 Springer-Verlag London

Zhang Z.,Xi'an Jiaotong University | Peng L.,Xi'an Jiaotong University | Wang J.,Xi'an Jiaotong University | Li Y.,Xi'an Jiaotong University | Liu R.,Baoji Titanium Industry Co.
Procedia Engineering | Year: 2011

In this paper, the dynamic process of explosive welding for large-sized plates is studied by numerical simulation. Folding deformation could be found during the process of explosive welding based on the studies on the morphological changes of the flyer plate at different time. The calculation results are in good agreement with the practical projects. The study shows that folding deformation is a crucial problem which should be noticed in the process of explosive welding, and the reasons for folding deformation are discussed in the paper. The conclusion can give reference for the development of explosive welding technology. © 2010 Published by Elsevier Ltd.

Chen J.,Northwestern Polytechnical University | Chen J.,Xi'an Technological University | Yan W.,Northwestern Polytechnical University | Yan W.,Xi'an Technological University | And 3 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2011

The texture evolution of cold drawing copper wires produced by continuous casting was measured by X-ray diffractometry and electron back-scatter diffractometry, and was simulated using Taylor model. The results show that in the drawn poly-crystal copper wires produced by traditional continuous casting, 〈111〉 and 〈100〉 duplex fiber texture forms, and with increasing strain, the intensities of 〈111〉 and 〈100〉 increase. In the drawn single-crystal copper wires produced by Ohno continuous casting, 〈100〉 rotates to 〈111〉, and there is inhomogeneous distribution of fiber texture along radial direction of the wires, which is caused by the distribution of shear deformation. Compared with 〈100〉, 〈111〉 fiber texture is more stable in the drawn copper wires. Comparison of the experimental results with the simulated results shows that the simulation by Taylor model can analyze the texture evolution of drawn copper wires. © 2011 The Nonferrous Metals Society of China.

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