Xiang Ru Liu

The researches of non-oriented silicon steel are mainly focused on the effect of main processing parameters on the microstructure and magnetic properties, but there have been few studied about its flow stress until now. In this paper, the non-oriented silicon steel 50A1300 of hot forming is studied by thermal-mechanical simulation method. The hot deformation behavior of the steel is explored and the flow stress model of the steel is established based on the creep mechanism. The model has good accuracy and is feasible.

Electrical steel

Flow stress

10.4028/scientific5/amr.446-449.3591

Cite

Citations (0)

Experimental Study of Hot Extrusion Micro Gear of Brass H62

Advanced materials research (2011)

Xu Zhou Xiang Ru Liu

A new micro-forming method, combining a metal’s super-plastic behavior with hot extrudsion technology, has been developed for manufacturing micro-gear from brass H62. The micro-gear, which modulus m = 0.125mm, pressure angle α = 20°, number of teeth z = 6, tip diameter d = 1mm, was selected and its dies were designed with a better die approach angle based on the DEFORM-3D FEA simulation results of the hot extrusion process. Finally the micro-gear was successfully hot extruded at 650°C from blank Φ3mm×3mm with extrusion ratio about 17. A good dimensional accuracy for micro-gear was obtained by using this hot extrusion technology. In the special die set, the split die structure was designed, and the special die materials were chosen, such as the pressure ram was made of tungsten carbide, and the other dies were made of mold materials 4Cr5MoSiV1.

Brass

Tungsten Carbide

Blank

Pressure angle

10.4028/www.scientific.net/amr.189-193.2903

Cite

Citations (0)

Hot Forming Flow Stress Model of Steel 50A1300

Advanced materials research (2012)

Xu Zhou Xiang Ru Liu Xu Shan

The researches of non-oriented silicon steel are mainly focused on the effect of main processing parameters on the microstructure and magnetic properties, but there have been few studied about its flow stress until now. In this paper, the non-oriented silicon steel 50A1300 of hot forming is studied by thermal-mechanical simulation method. The hot deformation behavior of the steel is explored and the flow stress model of the steel is established based on the creep mechanism. The model has good accuracy and is feasible.

Electrical steel

Flow stress

10.4028/www.scientific.net/amr.446-449.3591

Cite

Citations (0)

Ultraviolet Photoluminescence on Nano-Crystalline 6H-SiC

Key engineering materials (2008)

Hui Wang Tong Wei Li Zheng Xin Tang Jing Han You Xiang Ru Liu

Ultraviolet

10.4028/0-87849-473-1.319

Cite

Citations (0)

The Forging Penetration Efficiency of C45 Steel Stepped Shaft Radial Forging with GFM Forging Machine

Advanced materials research (2010)

Xiang Ru Liu Xu Zhou

The numerical thermal mechanical simulation of radial forging process of C45 steel stepped shaft with GFM forging machine was carried out by three dimensional finite element method DEFORM 3D. According to effective plastic strain, mean stress and mean plastic strain distribution of the radial forging process, the forging penetration efficiency (FPE) was studied throughout. The results show that: effective plastic strain in the center of the forging is never be zero; The mean stress in the center of the workpiece is proposed to describe hydrostatic pressure in this paper. There is compressive strain layer beneath the surface of the workpiece, while there is tensile strain layer in the center of the forging. These studied results could be a valuable reference for designing the similar forging operations.

10.4028/www.scientific.net/amr.154-155.593

Cite

Citations (4)

Hot Forming Behavior and Flow Stress Model of Steel 50A1300

Advanced materials research (2011)

Xu Zhou Xiang Ru Liu

The researches of non-oriented silicon steel are mainly focused on the effect of main processing parameters on the microstructure and magnetic properties, but there have been few studied about its flow stress until now. In this paper, the non-oriented silicon steel 50A1300 of hot forming is studied by thermal-mechanical simulation method. The hot deformation behavior of the steel is explored and the flow stress model of the steel is established based on the creep mechanism. The model has good accuracy and is feasible.

Flow stress

Electrical steel

10.4028/www.scientific.net/amr.418-420.1468

Cite

Citations (2)

The austenitic peak stress model of low alloy steel at elevated temperature based on the valence electron theory

International Journal of Computational Materials Science and Surface Engineering (2018)

Zheng yang Chen Xiang Ru Liu Xu Zhou

The traditional method of calculating the high-temperature austenite peak stress empirical model proposed by Sellars and McTegart has been used for 50 years. A new method based on the valence electron theory is presented in three steps. The first step is to calculate the austenitic valence electron parameters and their statistical values at high temperature. The second one is to calculate the binding energy and total binding energy based on the valence electron statistic parameters. The total binding energy is defined as the sum of the mole fractions of the constituent elements in low alloy steel and the corresponding binding energy. The last step is to establish the model of austenitic peak stress at elevated-temperature based on the combination of Hall-Petch formula and Misaka formula as well as the total binding energy. The prediction results show that the austenitic peak stress model presented in this paper has good precision.

Valence electron

10.1504/ijcmsse.2018.10016523

Cite

Citations (0)

Brass H62 Hot Extrusion of Micro Gear

Materials science forum (2011)

Xiang Ru Liu Xu Zhou

Gears are very important and widely used driving components in mechanical instruments, and the demands of micro-gears are increasing more and more active as the MEMS technology develops in recent years. In this paper, a brass micro gear, which modulus m = 0.125 mm, pressure angle α = 20°, number of teeth z = 6, addendum circle diameter d = 1 mm, hot extruded from brass H62 billet with size Φ3×3 mm at 650°C was studied by experimental method. The microstructure of the micro gear was observed by scanning electron microscope and optical microscope, and the conclusions are as follows: the fiber flow lines within the micro-gear were formed by the extrusion, so that the anisotropic mechanical properties of the micro-gear was happened; The tissue distribution of micro-gear was that, the surface of the gear is almost entirely α-phase, while the internal part of the gear was the mixture of α-phase and β-phase, because the α-phase with lower hardness flowing outward to the surface of the gear during the extrusion process.

Brass

10.4028/www.scientific.net/msf.704-705.236

Cite

Citations (0)

The austenitic peak stress model of low alloy steel at elevated temperature based on the valence electron theory

International Journal of Computational Materials Science and Surface Engineering (2018)

Xu Zhou Xiang Ru Liu Zheng yang Chen

The traditional method of calculating the high-temperature austenite peak stress empirical model proposed by Sellars and McTegart has been used for 50 years. A new method based on the valence electron theory is presented in three steps. The first step is to calculate the austenitic valence electron parameters and their statistical values at high temperature. The second one is to calculate the binding energy and total binding energy based on the valence electron statistic parameters. The total binding energy is defined as the sum of the mole fractions of the constituent elements in low alloy steel and the corresponding binding energy. The last step is to establish the model of austenitic peak stress at elevated-temperature based on the combination of Hall-Petch formula and Misaka formula as well as the total binding energy. The prediction results show that the austenitic peak stress model presented in this paper has good precision.

Valence electron

10.1504/ijcmsse.2018.095319

Cite

Citations (0)

Ultraviolet Photoluminescence on Nano-Crystalline 6H-SiC

Key engineering materials (2008)

Hui Wang Tong Wei Li Zheng Xin Tang Jing Han You Xiang Ru Liu

SiC films were prepared by HFCVD technique on (111) Si substrate. The composition and the structure of the films were investigated using EDX, XRD and transient fluorescence. Results indicated the films deposited were nanocrystalline and the calculation of the grain size gave a further confirmation. PL measurement of the present films showed that there existed a strong ultraviolet emission at room temperature.

Nanocrystalline material

Ultraviolet

10.4028/www.scientific.net/kem.368-372.319

Cite

Citations (0)

Papers

Citation

H-Index

i-10 index

Papers

Citation

H-Index

i-10 index