Advanced Materials Research Vols. 146-147

Abstract: The influence of Titanium slag with different compositions on desulfurizing was investigated, and the influence reasons based on the experiments of viscosity was also analysed. Basicity and composition of the slag was optimum as follows: the basicity 1.15~1.2, the content of TiO2 under 7wt%, the content of MgO 10wt%~11wt%, the content of MnO2 0.5wt%, the content of Al2O3 under 11wt%.

Abstract: Hot deformation was applied on Fe-3%Si by the Gleeble-1500 thermo-mechanical system, and the effect of solute depleted area around the primary MnS particles precipitated prior to hot deformation on the distribution of strain-induced MnS particles was investigated. The obtained results showed that the depleted area around primary MnS particles affects significantly the distribution of strain-induced MnS particles, and the involved parameters were discussed.

Abstract: According to the structure of functional properties of aluminum foam, made machine noise enclosures with aluminum foam/steel composite panels was proposed. The mathematical model of sound energy transmission coefficient of aluminum foam/steel composite panel was established. Optimization the model through the MATLAB optimization toolbox gets the thickness and density of foamed aluminum on the best acoustic effects. It provides a reference for the design and manufacture of the lathe acoustical enclosure plate.

Abstract: For a product packaging system with honeycomb paperboard, its impact resistance caused by drop impact behavior had been concerned. However, irregular hexagon structure of the paper honeycomb core exists in package business, which is attributable to laggard glue applicator. It has an impact on its impact characteristics. Drop impact behavior of packaging system with irregular honeycomb core has been put forward to know its influence. First, on the basis of theoretical analysis, a series of honeycomb paperboards with different size dimension of paper honeycomb core had been set up in the FEA software. Then a packaging system which made up of rigid body and deformable body had been analyzed. The results show that the physical dimension of paper honeycomb core has a great effect on its impact resistance: with the increasing on degree of irregularity of paper honeycomb core, the peak acceleration has a quickly alteration. At the same time, when the length of glued edge is in near 4 mm and the girth of honeycomb core is 36mm, honeycomb paperboard can improve the energy absorption ability in the condition of elastic deformation. The research results can be used to optimize the structure design.

Abstract: The research results of mechanical properties, hydrogen embrittlement and corrosion fatigue of new and corroded galvanized wires which were used in cable-supported bridges were summarized. Actual tensile strength of corroded wires did not decrease with corrosion levels, whereas elongation and torsional strength decreased sharply after the zinc layer was partly depleted and the steel started to corrode. The accumulated amounts of diffusive hydrogen of corroded wires with and without induced tension were almost the same and were well below a critical value of 0.7ppm. Therefore, induced tensions of steel wires did not affect the amount of diffusive hydrogen and below the critical concentration to cause brittleness. Fatigue strength did not change only when the galvanized layer was corroded, but it significantly decreased after the steel corrosion below the galvanized layer progressed. The corrosion fatigue life under wet conditions was shorter than that under dry conditions. The endurance life of pre-split steel wires was decreased in stress amplitude and increased in load frequency under fluctuating loading and corrosive environment, the aggressive media accelerated the growth rate of the fatigue crack.

Abstract: A low-cost microfabrication tool based on digital mirror device(DMD) is presented in this paper. The imaging principle of the system is described and the fabrication methods for binary and nonbinary micro optical elements(MOE) are also discussed in detail. It is expected to provide an understanding of MOEs fabrication using DMD-based maskless lithography technique.

Abstract: Sr1-xNdxFe12O19 ferrites were Synthesized via sol–gel and self-combustion methods with Fe(NO3)3·9H2O，Sr(NO3)2 and citric acid. The as-synthesized powder was studied by differential scanning calorimeter (DSC). X-ray diffraction (XRD) and vibrating sample magnetometer (VSM) were applied to investigate the structure and magnetic properties. The powder was synthesized in different calcination temperature and doping content of Nd2O3. The experiment reveals that the magnetic properties of Nd3+ doped ferrites are less sensitive to calcination temperature comparing with no doping ferrites. The coercivity (Hcj) of Nd3+ doped ferrites reach 423.96 kA·m-1.

Abstract: Most measuring methods used now can only measure the rigid body’s six inertial parameters like the moment of inertia, the product of inertia and the centre of inertia toward to two-dimensional reference system. So a new method which can measure all the nine inertial parameters toward to three-dimensional reference system is proposed. The moment of inertia of object rotating the axis is obtained by energy decay method. Through using the translation and rotation transformation theory of product of inertia, the formula of moment of inertia including the information of product of inertia and centre of inertia is deduced. Then equations are built to solve all the parameters. Furthermore, a measuring instrument is designed based on the aerostatic bearing. Results show that this new method is available and by analyzing the experimental data, suggestions are made to improve this measuring method.

Abstract: The microstructure and property of T91/10CrMo910 dissimilar steel welded joints after one and two years service have been studied by OM, TEM, EDS and Vickers hardness test in this paper. The results showed that after one year service the microhardness of T91/10CrMo910 dissimilar steel welded joints increased clearly and after two years service chromium element diffused or transferred from the welding line or T91 matrix to 10CrMo910 matrix. Coarse lath martensite was the characteristic of the microstructure of T91/10CrMo910 dissimilar steel welded joints, and the martensite laths became fragment after one and two years service. More carbide particles had been observed after one year service than that after two year service, which had a good agreement with the results of the micro-Vickers hardness test.

Abstract: The influence of low tempering temperature (TT) on mechanical properties and fracture toughness of ultra high strength boron steel 22MnB5 for hot forming was investigated by tensile and Kahn tearing experiments. Compared with the conventional quenchable boron steel, The results show that the toughness of tested steel are both preferable when tempered at 200 , 40min. When TT between 100 ～200 , The tear strength (TS) and unit propagation energy (UPE) of quenched steel heightened along with the temperature raised, but in 200~350 temperature range, the toughness appears negatively growth. Appropriate TT could improve the mechanical properties and fracture toughness obviously, and the temper brittleness can be avoided.