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Zhang C.,Harbin Institute of Technology | Kong F.,Harbin Institute of Technology | Xiao S.,Harbin Institute of Technology | Xu L.,Harbin Institute of Technology | And 4 more authors.
Materials Science Forum | Year: 2013

In this work, 2.5vol. % (TiB+TiC)/Ti composite was prepared by in situ casting route then 1-D forging. The microstructure and tensile properties were presented and discussed. The results indicate that the as cast microstructure can be significantly modified by 1-D forging. After forging, TiB and TiC segregated at the prior β grain boundaries within the as-cast composite tend to fracture and align perpendicular to forging direction. Reduction in aspect ratio of reinforcements and α lath is also observed. 1-D forging can enhance the strength and elongation of as cast composite significantly. However, the increment in strength is quite limited as strain temperature increases to 700 °C. Additionally, room temperature and high temperature fracture mechanisms are also discussed. © (2013) Trans Tech Publications, Switzerland.

Zhang C.J.,Harbin Institute of Technology | Kong F.T.,Harbin Institute of Technology | Xu L.J.,Harbin Institute of Technology | Zhao E.T.,Harbin Institute of Technology | And 5 more authors.
Materials Science and Engineering A | Year: 2012

In this paper, the tensile properties and fracture behavior of 7.5. vol% TiB/Ti composite sheet were studied in the temperature range RT-900 °C. The results show that the TiB/Ti composite sheet exhibits much higher ultimate strength in RT to 700 °C temperature range compared to matrix alloy sheet while a comparable strength at temperature above 700 °C. The ductility of the composite is much lower than that of the matrix alloy at all temperatures. The strengthening mechanism of the composite and strengthening effect of TiB varying with temperature are investigated. In addition, the softening behavior of the composite with the increasing temperature is discussed. Fractograph characteristic of the composite reveals that fracture of TiB whiskers followed by the ductile failure of the matrix is the main failure mechanism of the composite below 700 °C while interfacial debonding dominates the fracture mechanism of the composite sheet above 700 °C. © 2012 Elsevier B.V.

Wang J.,Nanjing University of Science and Technology | Zhao R.,Nanjing Baotai Special Materials Co. | Zhang X.,CAS Beijing Institute of Applied Physics And Computational Mathematics
Applied Mechanics and Materials | Year: 2011

The metallic glass particles reinforced aluminum matrix composites without obvious defects were obtained successfully by explosive compaction of mixed powders. The quasi-static compressive mechanical properties of the composites with the reinforcement matrix mass fraction 10%, 15% and 20% respectively were researched recur to universal testing machine of Instron 3367 and self-consistent theory. Finally, reinforcement mechanism of the metallic glass particles on the matrix was analyzed by numerical simulation recur to LS-DYNA program. The results show that the mechanical properties obtained by self-consistent theory are well accord with the experimental results; compared with pure aluminum, the yield stress of the composites with metallic glass particles reinforcement of the mass fraction 20% enhances 46.8 percent; the main reinforcement mechanism is the amorphous particles can undertake higher loading, the combined quality of the reinforcement particles with the matrix and the distribute uniformity of the reinforcement particles are important factors which will affect the reinforcement effects. © (2011) Trans Tech Publications.

Wang J.-X.,Nanjing University of Science and Technology | Zhou N.,Nanjing University of Science and Technology | Wang X.-X.,Nanjing University of Science and Technology | Hang Y.-F.,Nanjing Baotai Special Materials Co.
Gaoya Wuli Xuebao/Chinese Journal of High Pressure Physics | Year: 2011

Nanocrystalline copper was fabricated by severe plastic deformation of coarse-grained copper at high strain rate under explosive loading. The average grain size of the samples was tested by X-ray diffraction analysis, and the deformation process was simulated recur to LS-DYNA3D finite element program. The influence of strain on the grain refining were analyzed quantitatively. The results show that it is feasible to fabricate nanocrystalline copper by explosively dynamic plastic deformation of coarse-grained copper and the grain size of the NC copper can be controlled less than 100 nm, the higher strain is beneficial to the grain refining, and the distribution of the grain size is not uniform along the loading direction.

Liu F.,Nanjing Baotai Special Materials Co. | Deng N.-J.,Nanjing Baotai Special Materials Co. | Rui T.-A.,Nanjing Baotai Special Materials Co.
Petrochemical Equipment | Year: 2013

This thesis discusses how do mechanical property, welding performance, explosion welding performance and temperature of nickel alloy N06059 influence its corrosion resistance by test and inspection. The results show that N06059 alloy has a good explosion welding performance and can be further applied.

Yang L.-J.,Nanjing Baotai Special Materials Co. | Deng N.-J.,Nanjing Baotai Special Materials Co. | Li Y.,Nanjing Baotai Special Materials Co. | Fang Y.,Nanjing Baotai Special Materials Co.
Petrochemical Equipment | Year: 2012

The fabrication difficulties and control key points of Tal-T2-304 clad vessels were analyzed according to the characteristics of tantalum, and the processing method and welding key points of related parts of tantalum clad vessels were briefly stated. Using of the equipment operating normally, safety usage requirement.

Yang L.-J.,Nanjing Baotai Special Materials Co. | Zhao R.-J.,Nanjing Baotai Special Materials Co.
Petrochemical Equipment | Year: 2014

Titanium steel composite plate equipment, hydraulic test pressure reached 21 MPa. The titanium liner, stickers, flanging, the sealing surface and other important manufacture were introduced in detail. The equipment manufacturing process strengthened the control of the details, to ensure a successful hydraulic test.

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