The microstructure, hardness and corrosion resistance of the tungsten alloy hardened layer, which was hardened by different power of electrospark, were investigated. The results show that the matrix and the electrode of the tungsten alloy were melted into each other after hardened by electrospark. The...

The 20CrMnTiH gear steel was heated at temperature range from 850°C to 1250°C and at holding time range from 0s to 480s to obtain the law of austenite grain growth by using Gleeble-3500 thermo-simulation-machine in this research. The effects of heating temperature and holding time on austenite grain...

In this paper, the preparation methods of aluminum-magnesium alloys are reviewed. The three methods of preparation of aluminum-magnesium alloys are introduced: the mixing method, mechanical alloying method, electrodeposition method. And the advantages and disadvantages and characteristics of three methods...

With the development of the plastic connection technology and laser welding technology, as well as the improvement of the processing requirements of automotive plastic parts, laser transmission welding method is the first choice for the welding method of automobile plastic welding, which has the advantages...

The detail fatigue rating (DFR) value of riveted lap joints made of 2198-T8 aluminum-lithium alloy was measured and calculated based on the fatigue test results. Fatigue fracture surface morphology was examined by scanning electron microscopy (SEM). The results indicate that DFR value of 2198-T8 alloy...

This paper gives an introduction to the application research and the quality status of X80 HSAW pipe. The line pipe specification was analyzed combining with the properties of the practically manufactured pipe in this paper. It's shown that the pipe manufactures have established the steel design process...

Polycrystalline aggregate models are built based on the theory of Voronoi diagram, then crystal plasticity finite element method (CPFEM) is used to study the relationship of microstructures and stress-strain responses in Ti-6Al-4V alloy during uniaxial tensile tests at room temperature. Stress–strain...

By using the finite element software, the thermal process of TC4 Ti-alloy large die forging two beam is analyzed, the influence of billet initial heating temperature and compressor speed on the distribution of grain and phase is revealed. The research shows that fine and uniform microstructure will be...

Metal inert-gas welding of 7005 aluminum alloy profiles was conducted using ER5356 filler wire. The mechanical properties and microstructures of the welding joint were investigated by OM, SEM, micro-hardness test and tensile test. The results show that the tensile strength, yield strength, and elongation...

The microstructure and mechanical properties of rapidly solidified powder metallurgy Mg-5Sn alloy were studied in this paper. The results show the nano-scale Mg2Sn phases are dispersed homogeneously in the fine -Mg matrix for the RS P/M Mg-5Sn alloy. In addition, it is also found that the submicron structure...

The effect of electric fields on the aging phase transformation of Al-Zn-Mg-Cu alloys is investigated with the first-principles method combined with vacancy mechanism. The effects of external electric field with different direction on aging phase transformation and electron structure are analyzed. Results...

In this study, the Zn-30Al-1Cu (wt%) alloy and TiB2/Zn-30Al-1Cu composite were synthesized by the spray atomization and deposition technique. The microstructures and mechanical properties of the spray deposited alloy and composite were studied using scanning electron microscopy (SEM), transmission electron...

Zn-30Al-xCu (x=0, 1, 2, 4) alloys were prepared by the spray atomization and deposition technique. The microstructures of the spray-deposited alloys were investigated by means of scanning electron microscope, transmission electron microscope, X-ray diffraction. The results indicate that the 1 wt. % Cu...

Laser impact welding is a relatively novel solid welding technique. In this study, weldability of three layer aluminum foils by laser impact welding has been experimentally investigated. Besides, the welding area and interface morphology of the welded joints were also studied. Experiment results show...

Dynamic recrystallization (DRX) behaviors of a near- titanium alloy during isothermal hot-tensile tests were investigated with finite element simulation and electron backscattered diffraction (EBSD) test. The results show that the DRX behavior of the alloy is strongly sensitive to the strain rate, i.e.,...

The elastic constants (cij) and elastic properties of B2-phase FeAl intermetallic compounds and Fe–Cr–Al ternary alloys are studied by performing first-principles density functional theory calculations. The stable structures of Fe–Cr–Al and the elastic constants of FeAl and Fe–Cr–Al are predicted within...

The microstructure and mechanical properties of 0Cr21Ni6Mn9N austenitic stainless steel cold drawn pipe were investigated at various annealing temperatures. It was found that the tensile strength and the yield strength increased slightly, and then decreased with the temperature increasing from 200 to...

Oxidation tests were performed in water vapor at 590 °C by mass gain to study the oxidation behavior under working conditions of TP304H steel, which is a new alloy steel used for overheaters and reheaters in high–parameter boilers operated in thermal power stations. The microstructure was observed in...

The effect of Mo content on microstructure and mechanical properties of TiC steel bonded carbide was investigated when Mo content was 0.6%, 1.25%, 2% and 2.5% respectively. Results showed that density, hardness and transverse rupture strength of the sintered material achieved the best combined values...

Nickel pre-plating on stainless steel parts, electroplating Zn-Ni alloy layer on the basis of pre-plating layer. In order to improve the bonding strength between the coating and substrate by the introduction of nickel to form a good bonding with the iron matrix. To explore the influence of nickel pre-plating...

The Ni-Co-Ti (CN) composite coatings were prepared on aluminum alloy by eletro deposition technology. The effects of eletro deposition process parameters on the tribological properties of composite coatings were investigated, and the best eletro deposition process parameters were determined. The tribological...

The zinc based coating weight and thickness under different protective atmospheres and zinc bath chemistries were studied in laboratory by HDPS (hot dipping process simulator). The results show that, the coating had a good adhesion on matrix with no leakage and micro crack, the binder course of coating...

An important factor of wiping parameters-wiping speed was controlled precisely in the paper to study its effect on galvanized coating weight and thickness. The experiment was conducted by a hot dipping process simulator, the experimental steel was immersed in a zinc bath of Zn-0.24Al (vol%) at stable...

The otter board is a vital component of single trawl system, of which the hydrodynamics can directly affect the trawl operation and catch performance. This paper studied the hydrodynamics of the rectangular otter board using numerical simulation, and the simulation accuracy was verified by flume tank...

The adiabatic shear bands were induced in Ti6Al4V alloy with original equiaxed grain by compressing cylindrical sample with the strain rate of 50s-1 at 750 C and studied by using electron backscattered diffraction. Three regions of matrix, elongated transition region and ASBs, can be observed in the...

For studying the metal's three-dimentional platic flow mechanism along the longitudinal direction and lateral direction in rail universal rolling, the relationship between the metal flow volume and the elongation coefficient of different parts of rail was proposed, then the elongation coefficient of...

The high strength low alloy steel's (HG785D) welded joint was formed by strength match under MAG (80% Ar +20% CO2). The microstructure, micro-hardness and fatigue crack growth rate of the parent metal, weld and heat affected zone were tested and analyzed. The results show that the heat affected zone's...

Corrugated structures have wide application in engineering. The corrugated structure is replaced by an orthotropic plate with equivalent stiffness properties in this paper. After equivalent stiffnesses are obtained, deflections and modals of simply supported orthotropic plates can be analyzed theoretically,...

Detailed wind prood joints design in aluminium standing seam metal roofing system is discussed in this paper. The aluminum standing seam metal roofing systems are more widely used in large public buildings; different actual project shows that it meets the complex shape of the building and the natural...

System introduced standing seam roofing system, which is mainly used in large-span self-supporting structure of a closed system; in recent years, with the further development of metal materials technology and engineering technology, since the metal roofing system with light weight, durability and high...