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MOTIONS OF alloying additionS IN GAS STIRRED LADLES

Acta Metallurgica Sinica(English Letters) 2001年第5期14卷 359-367页

作者： S.C. Fan, B.K. Li and J.C. He Department of Thermal Engineering, Northeastern University, Shenyang 110004, China Dept. of Thermal Eng. Northeastern Univ. Shenyang 110004 China

A mathematical model has been developed to analyze the flow patterns and subsurface trajectories of spherical shaped particles (alloy additions) in gas stirring ladles. First, a numerical method to solve fluid flow problems in conjunction with a curvilinear coordinate system is proposed. The internal boundary in flow field, which must be designated in the cylindrical polar coordinate system, can be avoided by using body- fitted coordinate system (BFC). Consequently, computed flow of molten steel and paths of alloying additions are able to cross smoothly the geometric centerline of cylindrical vessel. Second, motion of particles is calculated in the three-dimensional coordinate system, the modification of parameters, such as the drag coefficient and density in the gas plume region, is examined. When the density of sphere is closer and closer to that of fluid, the path of motion is longer and longer. If the plug is moved off-centered to the half of radius, the path of sphere is prolonged, and the sphere may go through the geometric centerline of vessel, reach the deeper region. The immersed depths increase with increasing entry velocities.

关键词： alloying addition gas stirring ladle motion

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Role of trace additions of Ca and Sn in improving the corrosion resistance of Mg-3Al-1Zn alloy

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1559-1569页

作者： Panpan Wang Haitao Jiang Yujiao Wang Yun Zhang Shiwei Tian Yefei Zhang Zhiming Cao Institute of Engineering Technology University of Science and Technology BeijingBeijing 100086China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The limited wide applicability of commercial Mg alloys is mainly attributed to the poor corrosion *** of alloying elements is the simplest and effective method to improve the corrosion *** on the low-cost alloy composition design,the corro-sion behavior of commercial Mg-3Al-1Zn(AZ31)alloy bearing minor Ca or Sn element was characterized by scanning Kelvin probe force microscopy,hydrogen evolution,electrochemical measurements,and corrosion morphology *** revealed that the potential differ-ence of Al_(2)Ca/α-Mg and Mg_(2)Sn/α-Mg was(230±19)mV and(80±6)mV,respectively,much lower than that of Al_(8)Mn_(5)/α-Mg(430±31)mV in AZ31 alloy,which illustrated that AZ31-0.2Sn alloy performed the best corrosion resistance,followed by AZ31-0.2Ca,while AZ31 al-loy exhibited the worst corrosion ***,Sn dissolved into matrix obviously increased the potential ofα-Mg and participated in the formation of dense SnO_(2) film at the interface of matrix,while Ca element was enriched in the corrosion product layer,resulting in the cor-rosion product layer of AZ31-0.2Ca/Sn alloys more compact,stable,and protective than AZ31 ***,AZ31 alloy bearing 0.2wt%Ca or Sn element exhibited excellent balanced properties,which is potential to be applied in commercial more comprehensively.

关键词： AZ31 Mg alloy micro-galvanic corrosion alloying addition Volta potential precipitates

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Correlation of microstructural and corrosion characteristics of quaternary shape memory alloys Cu-Al-Ni-X(X=Mn or Ti)

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Transactions of Nonferrous Metals Society of China 2015年第4期25卷 1158-1170页

作者： S.N.SAUD E.HAMZAH T.ABUBAKAR H.R.BAKHSHESHI-RAD Faculty of Mechanical Engineering Universiti Teknologi MalaysiaJohor Bahru 81310 Johor Malaysia

The effects of different contents(0.4%, 0.7%, and 1.0%, mass fraction) of Mn or Ti additions on the micro structure, shape memory effect and the corrosion behaviour of Cu-Al-Ni shape memory alloys were studied by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, differential scanning calorimetry and electrochemical and immersion tests in NaCl solution. It was observed that the microstructure, shape memory effect and corrosion characteristics are highly sensitive to the composition variations. It was found that the highest strain recovery was with 0.7% addition of Mn or Ti. This may be attributed to the presence of precipitation with a high volume fraction and the grain refinement. The electrochemical test showed that the formation of oxide layers in both Cu-Al-Ni-Mn and Cu-Al-Ni-Ti shape memory alloys(SMAs) provided good passivation which enhanced the corrosion resistance of the alloys. Immersion test showed that in Cu-Al-Ni-Mn SMAs, pitting corrosion occurred through feebleness in the oxide layer. A corrosion product adjacent to the pits was rich in Al/Mn oxide and depleted in Cu while inside of the pit it was rich in Cu. In Cu-Al-Ni-Ti SMAs, localized corrosion occurred on the surface of the specimens and dealuminization attack was also observed in the matrix.

关键词： Cu-Al-Ni alloy shape memory effect electrochemical test alloying addition microstructure

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