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Man Liu,Jun Wang,Qi Zhang,Haijiang Hu,Guang Xu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
Five quenching temperatures were designed to investigate the relationship between volume fraction of retained austenite andmicrostructure, mechanical properties of a medium carbon quenching and partitioning (Q&P) steel. It is normally acceptedthat the optimal mechanical property of Q&P steels is obtained by quenching at optimum temperature, which corresponds tothe maximum amount of retained austenite. However, the present work clarified that maximum volume fraction of retainedaustenite in Q&P steels is indeed unrelated to the optimum mechanical property of steels. The microstructure consisting ofcoarse martensite laths, dispersive bainite and thin retained austenite films was obtained by quenching at fine martensite starttemperature (FMs), resulting in the optimum comprehensive mechanical property of Q&P steel with the better elongationat the expense of slightly smaller yield strength and tensile strength.
Combined Effect of the Prior Deformation and Applied Stress on the Bainite Transformation
Mingxing Zhou,Guang Xu,Li Wang,Haijiang Hu 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.6
There has been a continued interest over the past years in the effects of external stress or prior deformation onthe bainite transformation. In this study, the combined effect of prior deformation and stress on the bainitetransformation was investigated and the interaction between the effects of prior deformation and stress wasdiscussed in detail. The results show that although single deformation and single stress promote the bainitetransformation, their combination cannot promote the bainite transformation to a much larger degree. In addition, atthe early stage of transformation, the promotion effects of prior deformation and stress on the amount of the bainitetransformation are enhanced by each other. However, at the latter stage, the deformation weakens the promotioneffect of the stress. Moreover, prior deformation at a low temperature accelerates the kinetics of the bainite transformationwith stress, but it decreases the amount of the bainite transformation even if the deformation is small.
Fang, Baizeng,Kim, Min-Sik,Kim, Jung Ho,Song, Min Young,Wang, Yan-Jie,Wang, Haijiang,Wilkinson, David P.,Yu, Jong-Sung Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.22
<P>A very efficient, reproducible approach has been developed to fabricate a multiwall carbon nanotube (MWCNT)-supported, high Pt loading electrocatalyst. In this strategy, MWCNT was first functionalized with an anionic surfactant, sodium dodecylsulfate (SDS), to enhance the hydrophilicity of the MWCNTs for high Pt loading. The SDS-modified MWCNTs were further used to support high loading of Pt nanoparticles (NPs) through a urea-assisted homogeneous deposition (HD) strategy, followed by reduction using ethylene glycol (EG) as the precursor of a reducing agent. Through the input of SDS on the MWCNTs, Pt complex species can be readily anchored on the outer surface of the MWCNTs, while <I>in situ</I> pH adjustment of the solution with urea and reduction by EG enable the Pt NPs to disperse very uniformly on the SDS–MWCNT support with small particles size. Due to its unique structural characteristics, such as high electronic conductivity, the one-dimensional nanotube structure favouring fast electron transfer and more uniform Pt NP dispersion on the support with smaller particle size, the SDS-MWCNT-supported Pt (60 wt%) catalyst considerably outperformed a commercially available Johnson Matthey catalyst with the same Pt loading supported on Vulcan carbon black, when they were each employed as a cathode catalyst in proton exchange membrane fuel cells.</P> <P>Graphic Abstract</P><P>Non-covalent functionalization of MWCNT by SDS gives high density anchoring of Pt(<SMALL>IV</SMALL>) species, while an EG homogeneous reduction allows a small metal particle size, resulting in greatly improved PEMFC performance for SDS–MWCNT-supported Pt cathode catalysts. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm10847f'> </P>
Structural Shear Wall Systems with Metal Energy Dissipation Mechanism
Li, Guoqiang,Sun, Feifei,Pang, Mengde,Liu, Wenyang,Wang, Haijiang Council on Tall Building and Urban Habitat Korea 2016 International journal of high-rise buildings Vol.5 No.3
Shear wall structures have been widely used in high-rise buildings during the past decades, mainly due to their good overall performance, large lateral stiffness, and high load-carrying capacity. However, traditional reinforced concrete wall structures are prone to brittle failure under seismic actions. In order to improve the seismic behavior of traditional shear walls, this paper presents three different metal energy-dissipation shear wall systems, including coupled shear wall with energy-dissipating steel link beams, frame with buckling-restrained steel plate shear wall structure, and coupled shear wall with buckling-restrained steel plate shear wall. Constructional details, experimental studies, and calculation analyses are also introduced in this paper.