A5101661888- Metallurgy and Material Forming
- Metal Forming Simulation Techniques
- Microstructure and mechanical properties
- Microstructure and Mechanical Properties of Steels
- Magnetic Properties of Alloys
- Metallic Glasses and Amorphous Alloys
- Magnetic properties of thin films
- Metal Alloys Wear and Properties
- Advanced machining processes and optimization
- Rare-earth and actinide compounds
- Aluminum Alloy Microstructure Properties
- Hydrogen embrittlement and corrosion behaviors in metals
- Mechanical Engineering and Vibrations Research
- Advanced Surface Polishing Techniques
- Magnetic Properties and Applications
- High-Velocity Impact and Material Behavior
- Fatigue and fracture mechanics
- Electromagnetic Effects on Materials
- Muon and positron interactions and applications
- Magnetic and transport properties of perovskites and related materials
- Welding Techniques and Residual Stresses
- Manufacturing Process and Optimization
- Industrial Vision Systems and Defect Detection
- Advanced Welding Techniques Analysis
- Surface Modification and Superhydrophobicity
Yanshan University
2006-2023
Nanchang Hangkong University
2018-2020
In this study, α-Fe/Nd2Fe14B nanocomposite magnets with strong crystallographic texture were prepared by controlled melt spinning. For a relatively low wheel speed of 10 m/s, the c-axis Nd2Fe14B crystals is predominantly perpendicular to plane ribbon, but it switches parallel ribbon direction at higher 20 m/s. The show magnetic anisotropy between in and out planes. High remanence 0.74Ms large energy product 24.3 MGOe observed
Dy films, deposited on the surface of sintered Nd–Fe–B magnets by magnetron sputtering, were employed for grain boundary diffusion source. High coercivity successfully prepared. Effects sputtering power and processes (GBDP) microstructure magnetic properties investigated in detail. The dense uniform films beneficial to prepare high GBDP. maximum value 1189 kA m−1 could be shown, which was an amplification 22.3%, compared with that as-prepared magnet. Furthermore, improved remanence energy...
In this study, the interface structure of α-Fe/Nd2Fe14B nanocomposite magnets has been investigated by employing both positron lifetime spectroscopy and two-detector Doppler broadening measurements positron–electron annihilation γ quanta. Positron studies show that there are two kinds structures in magnets. One characterized a 155 ps is determined to be interfacial amorphous layer. The other slack atomic which structural free volumes, were detected predominantly surrounded nonmagnetic atoms...
The evolution of interface structure $\ensuremath{\alpha}\ensuremath{-}{\mathrm{F}\mathrm{e}/\mathrm{N}\mathrm{d}}_{2}{\mathrm{Fe}}_{14}\mathrm{B}$ nanocomposites prepared by crystallization amorphous ${\mathrm{Nd}}_{9}{\mathrm{Fe}}_{83}{\mathrm{Co}}_{3}{\mathrm{B}}_{5}$ has been investigated employing positron annihilation techniques. Positron lifetime studies show that there are two kinds structures in the at 700 \ifmmode^\circ\else\textdegree\fi{}C. One characterized a 155 ps is...
In this study, X80 pipeline steel is prepared with different Nb contents through the thermo-mechanically controlled rolling process. The effects of using two on impact toughness and microstructure are examined various experimental techniques. results show that increase in content, transformation temperature Ar3 decreases, nucleation growth bainitic ferrite lath features (LB) promoted, while those granular bainite (GB) inhibited. addition, stability austenite phase increases content....
Hot compression tests were carried out on a Gleeble-3800 thermal mechanical simulator in the temperature range from 700 to 900 °C and strain rate 0.005 10 s−1 investigate hot deformation behavior of B1500HS high-strength steel. Softening mechanisms steel under different conditions analyzed according characteristics flow stress–strain curves. By analyzing processing experimental data, values steady stress, saturated dynamic recovery (DRV) softening coefficient, other factors solved these...
In this manuscript, the effects of Mo content on microstructure and impact toughness X80 thick-walled low-temperature pipeline steel were studied. Two test steels with different (0.25% 0.40%) prepared by thermo-mechanical control process. The properties measured at −45 °C, evolution was observed via an optical microscope (OM), a scanning electron (SEM), back-scattered diffraction (EBSD), transmission (TEM). Each showed formation mixed consisting polygonal ferrite (PF), granular bainite (GB),...
In this research, B1500HS high-strength steel with different thicknesses were laser welded, and the effects of welding speed post quenching investigated by analyzing microstructure, microhardness distribution, high-temperature tensile properties weld joints. The results show that an obvious difference can be found in metallographic structure grain morphology joint at locations, which also lead to significant uneven distribution hardness. After quenching, size original heat-affected zone was...
The necking phenomenon of metal sheet under high temperatures is serious and continues over a longer duration. It difficult to describe the high-temperature mechanical properties materials only on basis hardening behavior before necking. To obtain stress-strain curve considering diffuse stage, forward identification method based strain measurement proposed in this study. Here, field minimum cross-section region specimen obtained using DIC (digital image correlation) technique, average axial...
To predict the ductile fracture behavior of a ZK61M high-strength magnesium alloy sheet during hot deformation, experiments and numerical simulations were performed under specific conditions. According to stress state parameters strain data obtained for different specimens, undetermined coefficients four models solved using particle swarm optimization algorithm. error evaluation results, modified Wilkins model was most accurate. This introduced into finite element, results compared with...
A uniaxial high-temperature tensile test of an AA7075 aluminum alloy sheet was conducted using established induction heating system. Five different types specimens were designed to obtain the stress–strain curves at forming temperatures and strain rates so as construct modify Johnson–Cook constitutive model. The stress states numerically simulated ABAQUS finite element software, triaxiality equivalent fracture parameters extracted. ductile model constructed, error evaluation scheme determine...