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Keynote Speakers

Keynote Speeches


Prof. Changjiang Song
Shanghai University


Title: Metastable Phase high strength lightweight steels Prepared by Near Rapid Solidification

 
Metastable phase was usually used to enhance properties of metallic engineering material. For most metallic engineering materials, heat treating and deforming were usually carried out under the solid state conditions to obtain metastable phase and control its formation, which needed to be heated for two or even many times. Since all metallic engineering materials under solidification process during its production process, if the metastable phase can be directly obtained from liquid by control solidification process, it would improve properties and meanwhile simplify or even delete heat treating so as to save energy, reduce pollution, and enhance efficiency. This work attempted to directly produce lightweight steels with high performance by near rapid solidification technique, and study their structure evolution and mechanical properties. The experimental results showed that the mechanical properties of high strength lightweight steels prepared under near rapid solidification conditions are more than those made by traditional method (heat treating+ rolling). This results suggests that the near net shape method with near rapid solidification would have great potential applications to produce high strength lightweight steels with high performance due to its simple process.
 
Keywords: Advanced high strength steels, Near rapid solidification, Strip continuous casting, High Al steel, Lightweight steel


Qingli Zhang (Senior Engineer)
Ocean University of China


Title: Experimental study on cutting performance of 316L stainless steel based on micro texture tool

316L stainless steel is a common material for marine mechanical and electrical equipment. Poor cutting performance is limited to the application of 316L. The rake face of carbide tool (YW1) is micro textured to improve its machinability. And experimental study on cutting 316L stainless steel with micro texture cutting tools under dry cutting and cutting fluid lubrication. The results of the study show that under the condition of small feed and cutting fluid, the effect of vertical grooves is most obvious, which can reduce the feed resistance 9.06%, the main cutting force 22.16%, and the average friction coefficient 13.39%


 

Prof. Shiying Yan
Qingdao University

Title: Spin Polarization Effect and Structures for the Transition Elements Molecules

Transition elements, especially the molecular structure of the fourth and fifth periodic transition elements, are an important research focus. And we know that the same two light ground state of diatomic molecules, atoms is low in its multiplicity, for example, 2 s + 1 = 1 ~ 4, this is due to the result of the interaction between electron configuration, especially electronic matching results. But there some recent articles that [186], for heavy elements, that is not the case, such as Pun molecules (n = 2 and 4), we know that the atomic base Pu electronic configuration is 6 no matching form 7 fg, for Pu2 and Pu3 and Pu4 molecules, respectively has 12, 18 and 24 no paired electrons, multiplicity of Pu2 molecules may have 2 s + 1 = 1,3,5,7,9,11 and 13, multiplicity of Pu3 molecules may have 2 s,3,5,7,9,11,13,15,17 and 19 + 1 = 1. The possible multiplicity of Pu4 molecules is 2s+1=1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, and 25.The lowest energies of these molecules decrease with the increase of multiplicity. The lowest energies of Pu2, Pu3 and Pu4 molecules are 13,19 and 25, respectively. This is similar to the cluster of Pun molecules of uranium, so what does that mean? This indicates that for heavy elements Pu and U, the cluster of Pun molecules formed by them and the electrons in Un molecules prefer to spin in parallel, and this imbalance of electron spin is called spin activation effect. For actinide molecules, the main focus of research is now they spin activation effect of heavy elements compounds of potential energy function is also one of the important focus of scientific workers. For spin polarization effect of the transition elements no one concern, so our purpose is to investigate all diatomic molecules in the transitional elements, namely the fourth period of the transition elements all the spin activation effect of diatomic molecules, and the fifth cycle of the transition elements all diatomic molecule structure and the spin activation effect.

 



Oral Presentations


A. Prof. Songlin Ding
RMIT University, Australia


Title: Chatter and deformation in machining thin-walled flexible components


Flexible components are widely used in the automotive and aerospace industries. However, the low rigidityof workpiece and large quantities of material removal in machining process leads to the instability of the process such as chatter and deformation. Chatter is a detrimental phenomenon resulting from dynamic interaction between machining tool and workpiece. It can cause poor surface quality and reduced productivity, and thus become one of the main limitations to achieve high productivity and good surface quality. Meanwhile, the varying cutting forces during machining can excite cutter and part structures and lead to significant deflections. For these reasons, machining of flexible components has been a research emphasis of both industrial and academic researchers for many years. Plenty of studies have been carried out to solve these problems, and most proposed studies focused on how to predict, identify, prevent and suppress chatter and deformation. This paper reviews the progress of relevant research and classifies the existing strategies developed to ensure stable machining of flexible components. The most appropriate technique for each specific problem is selected and discussed considering various aspects of machining.


 
Prof. William Yu
Louisiana State University, USA


Title: Synthesis of Pt/Ag and Pt/Cu Nanostructures for Electrocatalytic Methanol Oxidation


Platinum-based materials are commonly used for the electrocatalytic methanol oxidation. We report the synthesis of two dendritic nanostructures from Pt/Ag and Pt/Cu for the reaction. Hollow dendritic Ag/Pt nanoparticles were synthesized by a double template method: Ag nanoparticles as hard-templates to obtain the hollow spheres and surfactant micelles as soft-templates to generate the porous dendrites. The size of the nanoparticles and the thickness of the shell were controlled by adjusting the amount of precursors. The Ag/Pt nanoparticles exhibited high activity (440 mA·mg-1) and stability in electrocatalytic methanol oxidation. Dendritic Pt/Cu nanoparticles were synthesized by a facile one-step method with surfactant Brij58 at room temperature and the Pt/Cu ratios on the morphology and size of nanoparticles were studied. Compared with dendritic Pt/Cu and commercial Pt black, the tripod-like Pt/Cu nanostructures exhibited higher electrocatalytic activity and CO tolerance for catalyzing methanol oxidation. The excellent electrocatalytic property is mainly owing to the synergetic effect of hollow cavity structures and porous dendrites. This method is simple, repeatable, and follows the green synthesis principle. Moreover, this synthetic method can be extended to fabricate other noble metal nanoparticles for broader applications.



 
Zhexin Lv
China University of Petroleum(East China)


Title: Properties Investigation and Microstructures Characterization of a Superhydrophobic Coating on 6061Al Alloy Substrate


In this study, a hierarchical structured superhydrophobic coating on 6061Al alloy substrate is prepared through a simple and cheap way using chemical displacement, vacuum heat treatment, and low-energy modification with stearic acid. The coating has the good superhydrophobicity with a static water contact angle (CA) of 158.3 ± 0.2° and a sliding angle (SA) of 5.0 ± 0.2°. The hierarchical microstructures in the Scanning Electron Microscope (SEM) are mainly randomly distributed micro-particles and feather-like microstructures. Due to these special structures, the Deionized (DI) water has a very low adhesion on the prepared coating. Especially, when the coating was covered with the fly ashes about tens of microns, the ashes are easy to roll off with a 10μL water drop from the height of 2 cm. Besides, the specimens put in the DI water for 1 months still possess the good superhydrophobicity, the low adhesion and the excellent self-cleaning. When the specimens were taken out of the oven with 200 °C for 12h, the coating still remains stable in the properties and microstructures.  In addition, the specimens put in the outdoor for 10 months still possess the superhydrophobicity with CA of 157.5 ± 0.3° and SA of 6.0 ± 0.2°.