S.B. Zhang and H. Nejishi (Department of Mechanical Engineering and Intelligent Systems
,
University of E feetro- Communications
,
Chofugaoka 1-5-1
,
Chofu-shi
,
Tokyo 182-8585
,
Japan)
金属学报(英文版)
In this paper local compressive deforming of a hexagonal tube of aluminum (JISA1050) is investigated by an electromagnetic forming. The hexagonal tubes are annealed for 1h. at 400℃, which have 55mm width with 1mm thickness, and 10mm corner edius. The deformed ation of the hexagonal tube, i.e., bead width, is 10, 15, 20mm, respectively. The magnetic flux density in the gap between the field shaper and the external surface of hexagonal tube is measured, and the result is that the magnetic flux density for a given voltage is almost identical along the gap) and decreases with increasing the gap. The profiles and the strain distribution of the hexagonal tube de- formed are affected by the change Of the charging voltage and the dimensions of a bead width. The greater compressive strum in the cireuwtrential direction is develOPed on plane part near corner,while tensile strain on the corner occurs. A metallic block is inserted inside the hexagonal tube so that uniform profile can be obtained. The simulation of the forming is performed by a finite-element method and compared with the experimental results.
关键词:
electromagnetic forming
,
null
,
null
,
null
,
null
Acta Physico-Chimica Sinica
The formation of polymer film of propargyl alcohol(PA) and its protective ability against corrosion in Fe/H2SO4 and Fe/H2SO4 + H2S systems have been investigated using impedance measurement. The composition and morphology of the corrosion surface of iron, on which PA polymerized at different times, were obtained with the aid of SEM and AFM as well as EDX. The results showed that PA polymerized into compact polymer film in Fe/H2SO4 and Fe/H2SO4 + H2S systems, which made iron surface smooth and have a morphologies of regular square structure in microscopic level. In Fe/H2SO4 system, macroscopic continuous polymer film of PA was not formed leading to local corrosion on electrode surface. In Fe/H2SO4 + H2S system, the adsorption of H2S and HS- on electrode surface slowed down the formation of polymer film of PA. However, the iron sulfide, produced after a longer time, increased the continuity of the polymer film of PA and therefore, the polymer film could perform its long-term inhibition action.
关键词:
polymer film of PA;H2S;Fe/H2SO4;inhibition effect;acetylenic alcohols;iron corrosion;adsorption;acid
乔桂英
钢铁
采用TEM、XRD、SEM等手段研究了Fv520(B)钢经过1 050℃固溶处理后,在750～850℃温度范围内中间调整处理对力学性能和抗H2S应力腐蚀性能的影响.结果表明:随调整处理温度的降低、时效温度的升高,钢的强度降低,抗H2S应力腐蚀性能提高.抗H2S应力腐蚀性能与残余奥氏体量有关.
关键词:
Fv520(B)钢
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力学性能
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SCC
Wenbo FEI
材料科学技术（英文）
This paper shows that it is easier to form intelligent ceramics than other materials. Self-adaptive factors and relevant function mechanisms, which determine the formation of intelligent ceramics, are studied and data from the design of the PLZT with complex functions are presented.
关键词:
$ D.L*
,
D.N.He
,
X.J.Bao
,
Y. Q.Zhang
,
X. Y.Ruan
,
J.L. Cheng and J. Y. Jiang 1) National Die & Mold CAD Engineering Research Center
,
Shanghai Jiaotong University
,
Shanghai 200030
,
China 2) Shanghai Volkswagen Automotive Company Limited
,
Shanghai 201805
,
China
金属学报(英文版)
With the combination of a new theoretical formula, physical simulation experiments, the technology of artificial neural network and database, an intelligent system for the prediction of sheet metal drawing capability is constructed for the first time. A modified criterion for sheet metal drawing capability is proposed in this paper, namely, the Technological Limiting Drawing Ratio, TLDR = f(R, n, s, t, F, μ,r_d,r_p…). Based on the studies of other scholars, a new formula is derived to predict the TLDR in this paper. Then a series of orthogonal physical simulation experiments are designed to investigate the effect of technological parameters on the TLDR, and the results are analyzed in the paper. Then the predicting system is constructed with the combination of the theoretical formula, orthogonal experiments, the technology of artifocial neural network and database. The predicted results show good agreements with experimental data, so it can be used to avoid the blindness in the selection of sheet metal before stamping. The system operates under the Windows operating system, and it supports the mechanism of Client/Server as well as Intranet, so the system has high engineering value.
关键词:
TLDR
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null
,
null
,
null
,
null
,
null
,
null
Chinese Physics
The dynamic equations of the proton transport along the hydrogen bonded molecular systems have been obtained by using completely quantum-mechanical method to be based on new Hamiltonian and model we proposed. Some quantum-mechanical features of the proton-solitons have also been given in such a case. The alternate motion of two defects resulting from proton transfer occurred in the systems can be explained by the results. The results obtained show that the proton-soliton has corpuscle feature and obey classical equations of motion, while the free soliton moves in uniform velocity along the hydrogen bonded chains.
关键词:
2-component solitary waves;thermodynamic properties;protein molecules;solitons;chains;dynamics;motion;conductivity;excitation;impurity
郎经纬
,
杜晓东
,
金绍彤
,
王夫成
,
詹马骥
,
周丹
,
沈健
,
刘光复
表面技术
doi:10.16490/j.cnki.issn.1001-3660.2016.07.005
目的：研究长输管线压缩机叶片材料FV(520)B不锈钢在高含H2S、H2O、CO2条件下的腐蚀行为。方法利用高温高压反应釜模拟特定工况，在H2S分压为0.9 MPa、CO2分压为0.6 MPa、温度为150℃的条件下于5 g/L的氯化钠溶液中制备硫化腐蚀层，利用XPS、SEM、XRD等手段对腐蚀层的成分及结构进行分析。结果 FV(520)B不锈钢的腐蚀速率逐渐降低，试样表面粗糙度先增大后下降，腐蚀产物主要为FeCO3、Fe3O4、FeS、FeS2、S、Cr2S3、Cr2O3和Cr(OH)3。结论在腐蚀前期，FeS的形成速率大于 FeS2、S，腐蚀产物颗粒不断长大。形成完整的 Cr2O3、Cr(OH)3保护膜后，腐蚀得到抑制，此时腐蚀反应主要为FeS2、S的生成，试样表面腐蚀产物颗粒尺寸变小，试样表面粗糙度降低。
关键词:
FV(520)B不锈钢
,
硫化腐蚀
,
H2S
,
CO2
