Advanced Engineering Materials

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Authors: Wei Bing Li, Fei Fan, Xiao Ming Wang, Wen Bin Li, Chuang Chen
Abstract: Using the LS-DYNA software, this paper studied the penetration phenomenon that the long rod armour-piercing projectile with the material of Wf/Zr metallic glass composites and tungsten-alloy penetrating into target. It found that the 93W alloy projectile has a clear mushroom head, and the Wf/Zr metallic glass composite projectile has an acute head and appears “self-sharping” effect obviously. It studied the variation law of the penetration results parameters of the two materials at different penetration initial velocity, and found that the “self-sharping” effect of the Wf/Zr metallic glass composite projectile change to more obvious with the increasing of penetration velocity. It also obtained the change law of the projectile head shape with the penetration velocity.
Authors: Guang Hui Zhang, Lin Liang Yin, Sheng Tao Zhang, Xiao Li
Abstract: The adsorption behavior of sulfamethoxazole as inhibitor for mild steel in 3% HCl solution at 298K has been studied by the methods of polarization curves, electrochemical impedance spectroscopy, weight loss, and quantum chemical calculation in this paper. Results revealed that the sulfamethoxzole acted essentially as the mixed-type inhibitor, and the spontaneous adsorption process involved in both chemical adsorption and physical adsorption. In addition, the adsorption of inhibitor on the steel surface followed Temkin adsorption isotherm model. However, the repulsion among the neighboring adsorbed molecule, as well as the single adsorption center of benzene ring, leaded the failure to form ideal protection film on the metal surface.
Authors: Fei Gao, Wei Na Zhang, Zhi Bo Zhang, Zhen Yu Liu, Guo Dong Wang
Abstract: The influence of finish rolling temperature on the precipitates and Lüders elongation in ultra purified ferritic stainless steels stabilized with Ti and V has been investigated, in which the hot rolled bands were produced by conventional rolling process and the finish rolling at relatively low temperatures. It was shown that finish rolling at relatively low temperatures promoted the formation of a large number of fine MC precipitates, which were denser in dispersion and finer in size than those formed in conventional rolling process by strain-induced precipitation, and consequently scavenging of interstitial atoms in solid solution, indicating that the finish rolling at relatively low temperatures can be the effective way to significantly reduced Lüders elongation for the final sheets. These results have been confirmed by the internal friction measurements.
Authors: Yong Zang, Bo Zhang, Li Hong Cui, Zhi Ying Gao
Abstract: A spot-test of cooling after the finish-rolling was performed for the typical H-beam and the temperature field during the process and residual stress in the beams after the cooling were measured. By using finite element method, the cooling temperature-field of the H700×300 H-beam was simulated and the thermal stress distribution formed in this process was calculated by using thermo-mechanical coupling function. The simulation results matched well with the data obtained on the spot. The accurate description performed in this paper for the temperature field and residual stress distribution of H-beam during cooling process is especially helpful to the manufacture plant. According to the results the reasonable technical parameters can be constituted to control the temperature of the beam in the cooling process and reduce the residual stress in the final product.
Authors: Jian Xin Guo, Jun You Liu, Jie Liu
Abstract: In this paper, a novel low-carbon high-manganese alloy containing boron was developed. The results indicate that the microstructure of the as-cast alloy is consist of ferrite matrix (with some residual austenite), M2B boride, M23(C,B)6 and Ti(C,N) phase, and the boride is distributed in the form of intermittent network, which is detrimental to the toughness of the alloy; after high temperature quenching heat treatment, boride was dissolved somehow and the volume fraction of boride was decreased, moreover, it is distributed more even which results in the further improvement of toughness and provisions non-proportional compression stress of the alloy; the effect of heat treatment on microstructure of the alloy was explained by thermodynamics.
Authors: Feng Shi, Yang Qi, Chun Ming Liu
Abstract: Precipitation behaviors of Fe-18Cr-12Mn-0.48N and Fe-18Cr-18Mn-0.43N high-nitrogen austenitic stainless steels isothermally aged at 800°C were investigated by using optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that precipitation both display discontinuous cellular way and the major precipitates are both M2N phases accompanied by scattered M23C6 phases at grain boundary in the experimental steels. Increment of Mn content can not change the precipitation way and precipitation type. Increment of Mn content makes M2N precipitates obviously increase and increment of Mn and C contents makes M23C6 precipitates increase.
Authors: Zhi Guo Luo, Zhan Xia Di, Zong Shu Zou, Ren Chen
Abstract: The raceway boundary is coarse and fragmentized, but all of previous studies are based on Euclidean geometry, which regard the dimension of raceway as an integer. In this paper, particle velocity contour has been developed to define the raceway boundary. The fractal method of calculating raceway size, which describe boundary with extremely un-regular or fragment characteristic, is brought forward in physical model. The result shows that the precise raceway boundary can be obtained by particle velocity contour, and the surface area of ellipsoidal raceway based on fractal is larger than that based on Euclidean.
Authors: Fei Ran Xu, Sheng Tao Zhang, Xiao Li
Abstract: The corrosion inhibition of 45# mild steel in 3%HCL solution by norfloxacin has been studied by weight loss measurement, Tafel polarization, electrochemical impedance spectroscopy (EIS) and quantum chemical study. The inhibitor of norfloxacin shows 93.2% inhibition efficiency at optimum concentration 400mg/L. The polarization studies suggest that norfloxacin is the mixed-type inhibitor for 45# carbon steel in 3%HCL. Electrochemical impedance spectroscopy techniques are also used to investigate the mechanism of corrosion inhibition. What is more, the adsorption model obeys Langmuir adsorption isotherm at 298K. And the calculated quantum chemical also suggests that norfloxacin have excellent inhibition properties.
Authors: Bao Cai Wu, Feng Shi, Xin Yu Cheng, Rui Min Lin, Chun Ming Liu
Abstract: Microstructures and textures after annealing at 680°C in low carbon Al-killed steels with low finishing temperature and high coiling temperature were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM) and X-Ray Diffractometer (XRD). The results show that higher coiling temperature and lower finishing temperature can both cause the appearance of equiaxed grain and line cementite. The equiaxed grain in 2# steel with higher coiling temperature is the more obvious. Advantage textures are weak in the steels with higher coiling temperature and lower finishing temperature and volume fraction of {111}fiber in 2# steel with higher coiling temperature is only 7.17%, so the stamping property should be worse.

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