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2018年 25卷 3期
刊出日期：2018-03-25
255
Shu-ling Zhang . Wei-ye Chen . Gui-hong Geng . Zi-qiang Han . Yong-chuan Yu . Bo Zhang . Wen-jie Ding . Xue-jun Zhu
Influence of distance between paralleled metal fibers on giant magnetoimpedance
Giant magnetoimpedance (GMI) and the GMI effect of a Co-based fiber beam were investigated in the frequency range of 0.1–10 MHz, and the influence of distance between adjacent fibers on the distribution of the surface circumferential magnetic field and GMI effect was analyzed. Compared with a single fiber, the distribution of the surface magnetic field of paralleled fibers is non-uniform, induced by magnetic interaction between metal fibers. The originally uniformly distributed circumferential magnetic field changes into two obvious coexisting parts: one stronger and one weaker. The results prove that the strengthened circumferential magnetic field determines the GMI effect and sensitivity. It is found that the maximum surface of the circumferential magnetic field is reinforced by 88% when the four fibers are as closely parallel as possible; the GMI effect is greatest under higher field sensitivity. At 5 MHz, the sensitivity of the four-fiber beam reaches 3090 V/T, an increase of 277% compared with a single fiber. However, the magnetic interaction fades with the increase in distance between fibers and as the distribution of the surface magnetic field becomes even. The maximum magnetic field also becomes gradually equal to the level of a single fiber. When the distance is 1 mm, the maximum surface magnetic field is increased by 3.2%, and the improvement in the GMI effect is correspondingly slight. Therefore, a strong magnetic interaction among fibers can improve the intensity of the surface circumferential magnetic field and give rise to a fine GMI effect and high field sensitivity in Co-based metal fibers.
2018 Vol. 25 (3): 255-260 [
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261
Bin Luo Hong-xian Shen Lin Lin Hai-chao Li Da-wei Xing Jian-fei Sun
Mechanical property statistical analysis of Gd50Al30Co20 amorphous wires for providing reference to design requirements of cooling system
Gd50Al30Co20 wires show excellent magnetocaloric properties and high heat exchange rate due to the microsize. The Weibull and lognormal methods were used for systematically analyzing its mechanical properties for matching the design requirements in cooling system. The wire exhibits average fracture strength of ~969.5 MPa and typical fracture behavior of amorphous character. Moreover, the distributions of stresses for tensile strains at 10 values are estimated by probability plot and Chi-square goodness-of-fit test. The random stresses were best fitted by lognormal probability distribution for most studied cases; however, fracture strength was best fitted by Weibull probability distribution. It is interesting to note that the mean and standard deviation of the stresses (to reach specific tensile strain) increase as the tensile strain grows, accompanied by the coefficients of variation of stresses which decrease smoothly. It is concluded that the inhomogeneity of material does cause the scatter of stresses growth, and the scatter could be considerably large.
2018 Vol. 25 (3): 261-267 [
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268
Yu-hang Wei, Kun Zhang, Zi-qiang Zhao Yan-sen Li, Bing-chen Wei,
Helium ions irradiation-induced surface damage in Fe-based melt-spun ribbons
2018 Vol. 25 (3): 268-274 [
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275
Jin-ru Luo Xiao Song Mao-yin Wang
Effects of different types of twinning on microstructure and mechanical properties of a strongly textured TA2 commercially pure titanium alloy subjected to rolling at ambient and cryogenic temperatures
Strongly textured commercially pure titanium alloy TA2 plates with different initial textures have been rolled at cryogenic and ambient temperatures to 4% reduction and then post-annealed at 50 ?C for 12 h. Microstructures of the samples were investigated using electron backscatter diffraction. The mechanical property of the sheets was tested via quasi-static uniaxial tensile tests along the rolling direction at room temperature. The effects of initial texture and rolling temperature on twin activity and mechanical property have been investigated. Twinning is very active in TA2 titanium during rolling at either room or cryogenic temperature. (1122) contraction twins can be observed in all the sheets and are the dominant twin mode for the sheets with an initial texture having c-axes parallel to the normal direction (ND). Extension twins have rarely been seen in sheets having an initial texture with c-axes parallel to ND, but play quite an important role in the sheets having an initial texture with c-axes perpendicular to ND. The initial texture of the sheet is considered to determine the twin mode while the cryogenic rolling temperature is found to increase the numbers of twins. Post-annealing does not change obviously the rolled microstructure. After annealing, the strength decreases and elongation to fracture slightly increases. The cryorolled sample has the better strength with little loss in elongation, and this mechanical enhancement is attributed to massive twinning.
2018 Vol. 25 (3): 275-281 [
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282
Zhong-kun Bai Li-ming Du Ming Chen Min Zhang Xiao-hui Shi Hui-jun Yang
Sliding tribological characteristics of Ti48Zr20Nb12Cu5Be15 metallic glass matrix composites under different conditions
A systematic research on the tribological characteristics of Ti48Zr20Nb12Cu5Be15 metallic glass matrix composites was performed under different normal loads in dry condition and simulated seawater. The wear rate decreased with the increase in normal load under dry and simulated seawater conditions. The friction coefficient was lower in the dry condition than in the simulated seawater. The composite showed better wear resistance at lower loads (3, 5 and 10 N) but poor wear resistance at higher loads (15 and 17 N) in the simulated seawater. The analysis of the worn surface illustrated that the wear mechanism in dry condition was plastic deformation, adhesive wear and abrasive wear at 3 and 5 N, while it was abrasive wear and adhesive wear at 10, 15 and 17 N. The wear mechanism in simulated seawater was abrasive wear, plastic deformation and adhesive wear at 3 N, adhesive wear at 10 N, and abrasive wear at 5, 15 and 17 N. At the same time, the corrosion occurred during wear tests in the simulated seawater.
2018 Vol. 25 (3): 282-290 [
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291
Lian-yong Wang, Chao Liu Zhu Ye Wen-qiang Sun,
Pretreatment of metallurgical sewage via vacuum distillation driven by low-temperature exhausted gas from steel plants
2018 Vol. 25 (3): 291-297 [
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298
Run-sheng Xu, Jian-liang Zhang Wei Wang Hai-bin Zuo Zheng-liang Xue Ming-ming Song
Dissolution kinetics of solid fuels used in COREX gasifier and its influence factors
Carbon dissolution from solid fuels used in a COREX gasifier was investigated in a high-temperature furnace to investigate the influences of temperature, carbon structure and ash properties of solid fuels into molten iron on carbon dissolution behavior. The results showed that the final carbon content of molten iron and dissolution reaction rate of carbon increased as the temperature increased. However, the dissolution behavior of different solid fuels varied with their properties. At the same temperature, the dissolution reaction rate of solid fuel from high to low was coke, semi-coke and lump coal. The apparent reaction rate constants of solid fuel were calculated using the piecewise fitting method based on the experimental data. The analyzed results showed that the dissolution rates of solid fuels had a good correlation with their microcrystalline structures. Moreover, the carbon crystallite structures of solid fuels used in COREX had greater influence on dissolution behavior than their ash properties.
2018 Vol. 25 (3): 298-309 [
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310
Guang Wang Qing-guo Xue Jing-song Wang
Reduction and melting separation mechanism of boron-bearing iron concentrate/coal composite pellet
Realizing the boron and iron separation through selective reduction and melting separation of boron-bearing iron concentrate is of great significance for the utilization of crude ludwigite. The reduction and melting separation mechanism of boron-bearing iron concentrate/coal composite pellet was systematically investigated. The reduction and melting separation test of small size pellet was performed to reveal the evolution of slag and iron in the melting separation process. The isothermal reduction experiment showed the relationship between reduction stage and melting separation stage, and the step reduction and melting separation was perfectly achieved. Coal particles existed through the reduction and melting separation process and finally formed brown residue around the separated product. The pellet could not realize melting separation when the B2O3 content in the concentrate was lower than 6.00 wt%.
2018 Vol. 25 (3): 310-319 [
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320
Fei Yuan Hui-ning Zhang Hui Li Jian-hong Dong Hui-hui Xiong An-jun Xu
Recovery rates of iron, nickel, and chromium via iron-bath reduction of stainless steel dust briquettes based on corundum crucible erosion balance analysis
2018 Vol. 25 (3): 320-329 [
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330
Dong Wang Si-yi Luo Yang-min Zhou Chui-jie Yi
Thermogravimetric study of combustion of biomass and anthracite coal by iso-conversional method
The combustion characteristics of biomass, anthracite coal and their blends were investigated using thermogravimetry, and the kinetic parameters and combustion reaction mechanisms were tested by combining the iso-conversional method and Avrami method in order to find out the kinetics characteristics responsible for the combustion of samples. In biomass combustion, two peaks were observed at 332.3 and 472.3 ?C, but the reactive rate curve of coal showed one peak with maximum mass loss rate at 552.8 ?C. The ignition temperature and burnout temperature of blends decreased, and the ignition index and combustibility index increased with the increase in biomass content. Calculation of kinetic parameters showed that the values of activation energy of blends increased with increasing biomass content from 150.77 to 215.93 kJ/mol. The reaction orders of blends lay in the range of 0.44 and 0.78.
2018 Vol. 25 (3): 330-339 [
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340
Chen-chong Wang, Chi Zhang Zhi-gang Yang Jie Su
Carbide precipitation and element distribution in high Co–Ni secondary hardening steel
As the increasing need of the steels with both high strength and hydrogen embrittlement resistance ability, carbide precipitation and element distribution in high Co–Ni secondary hardening steel were concerned. Carbide precipitation and element distribution in M54 were observed using carbon replicas method. Both simulation and observation results showed that MC and M2C formed in the steel. MC was round particle, which would act as grain refiners. And M2C was needle-like phase, which would be remarkable strengthening phases. Nb and V were main metallic elements in MC phase. Mo and Cr were main metallic elements in M2C phase. W, Co, and Ni were probably mainly dissolved in the matrix. As the carbide precipitation in AerMet100 was M2C, which had similar size and shape with M2C in M54, the tensile strength and yield strength of AerMet100 and M54 were similar. Compared with traditional high Co–Ni secondary hardening steel, M54 had higher hydrogen embrittlement resistance ability, probably because of element W in the matrix.
2018 Vol. 25 (3): 340-346 [
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347
Xuan Yang Chang-gen Shi Yu-heng Ge Md Nahid Hasan Sabuj
Comparison of microstructure and mechanical properties of titanium/ steel composite plates by two manufacturing processes
2018 Vol. 25 (3): 347-352 [
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