Advanced Materials Research Vols. 791-793

Abstract: A new method of determination of C parameter of Larson-Miller equation was introduced. For 15CrMo steel, the optimal value of parameter C in the equation was derived. The reliability of the obtained results was analyzed.

Abstract: The flutter stability of the steel truss suspension bridge is hard to reach the requirement of the wind resisting stability when lacks the torsional stiffness. This paper discusses the influence of aerodynamic measure combination, such as central stabilizer, air director enclosed anti-collision bar and so on, towards the flutter stability of steel truss through the wind tunnel experiment of the bridge of Liu Jia gorge. The result shows: the effect of using both the upper and lower stabilized plate is better than separated used it. when sectionalized dispose upper stabilized plate, the flutter critical wind speed of attack angle will decrease rapidly. Outlaying the horizontal guide plate is better than internally installed; The flutter stability of different attack angle tend to be balanced by widening the horizontal guide plate. The anti-collision bar can be functionalized as the central stabilizer by heightening and enclosing, and effectively increase the critical wind speed of different attack angles of the high truss suspension bridge.

Abstract: Tensile test at ambient temperature, tensile test at high temperature and high temperature tensile creep test were carried out before remnant life prediction. According to the high temperature tensile creep test data, the relationship between working stress, working temperature and rupture life was obtained by MATLAB surface fitting tool. In order to obtain the temperature field and stress field of the superheater tube, ANSYS software was used. Then, the remnant life of the superheater tube was predicted by the extrapolating method and the relationship between working stress, working temperature and rupture life.

Abstract: Nowadays, the high chrome steel for roller is increasingly widely used in cold-rolled industry. The microstructure of rollers under forged annealed state has a significant influence on its final mechanical properties. This paper investigates the annealed microstructure of a new high chrome steel for roller, using methods of SEMDESXRD and hardness tests. The results show that the spheroidizing annealed high chromium steel is constitutive of ferrite and globular cementite, and the microstructure is relatively reasonable. But there are disadvantage characters such as small holes in the vicinity of the grain boundary, and residual lamellar pearlite exists in local area. In this paper, generation mechanisms of these characters are explained, and prevention methods are given for the weakness of the high chorme steel for roller.

Abstract: The performance of the aluminum alloy makes it the most popular lightweight materials for the automobile manufacturers. However, due to the disparity on the crystal structure,it has the higher springback values compared with steel. In order to solve the problem, we put forward a new springback compensation method based on displacement compensation principle and the principle of curved surface fairing design methods. Though full cycle simulation and calculate springback value for each working procedure, then generate the springback compensation surface. The methods practical application effect is good.

Abstract: The hydraulic cylinder is the essential component in the construction machinery, and the quality and safety of construction machinery products depends on its performance. As the main part of the hydraulic cylinder rod, the quality and reliability are the key indicators of the hydraulic cylinder. In this paper, the hard chrome plating layer of hydraulic cylinder rod was tested by metallographic analysis, surface morphology observation, hardness test, corrosion resistance experiment, in order to evaluate the anticorrosion, economy and technology of the electroplating technology, and discuss the anticorrosion mechanism, so the experimental and theoretical basis will be provided in the field of production. The contribution will be made by improving the corrosion resistance and wear resistance, increasing the operational reliability, extendeding service life of the hydraulic cylinder rod.

Abstract: nanoSiO₂/cellulose composite films were prepared via ionic liquids 1-ethyl-3-methylimidazolium acetate (EMIMAc) solution containing cotton pulp cellulose. The as-prepared composite films were characterized by means of scanning electron microscope (SEM) and thermogravimetric analysis (TGA). It was indicated that the surface structure of obtained films was dense and compact, which was composed of nanoSiO₂ particles. The modified nanoSiO₂ composite film showed a good thermal stability with decomposition temperature up to 692°C when the weight residue of the film was 50%. The tensile strength and elongation at break increased by 50% and 35% than that of original cellulose film without SiO₂. The film containing 0.5% SiO₂ showed a water flux of 249.8L.m².h^-1 and the retention of BSA by 97%.

Abstract: By some assumed conditions and by Fick first law (first used for release behavior of microcapsules), the release dynamic equation of idealized microcapsules in liquid phase was established. With extraction method and spectrophotometer, the light absorbance of extracted liquid was measured, the release dynamics in liquid phase and some relatively release parameters were acquired. The experiment indicated: the release behavior of the CVL core permeated from the wall of microcapsules into the liquid phase matched with zero-order release equation basically.

Abstract: TiZrN thin films have been prepared on high speed steel by using magnetron sputtering. Doping amounts of Zr were adjusted by changing the sputtering time of the Zr target. X-ray diffraction analyses show that TiZrN coatings consist of mixed crystals of TiN, TiZrN phases. The film microhardness first increases and then decreases with the increasing of Zr doping amount. With the same Zr doping amount, the microhardness of the samples will improve with the increasing of doping times.

Abstract: The temperature field is an important aspect to study the interaction mechanism between the laser and glass. The temperature distribution on the surface of the glass that illuminated by the CO laser is numerical simulated by using the finite element method. The change of the temperature field of the target, irradiated by the laser in different time or different power, is simulated respectively, get the curve of the temperature field which reflects the temperature at the center spot changing with the action time and power.