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Microstructure and Properties of Low Temperature Composite Chromized Layer on H13 Tool Steel

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Journal of Materials Science & technology 2005年第2期21卷 251-255页

作者： Cuilan WU, Chengping LUO and Ganfeng ZOU College of Mechanical Engineering, south china university of technology, Guangzhou 510641, china Coll. of Mech. Eng. South China Univ. of Technol. Guangzhou 510641 China

Low temperature composite chromizing is a process composed of a plain ion-carbonitriding or ion-nitriding at 550-580℃, followed by a low-temperature chromizing in a salt-bath of 590℃. The microstructure and properties of the low temperature composite chromized layer on H13 tool steel were investigated using metallography, X-ray diffraction, microanalysis, hardness and wear tests. It was found that this low temperature process was thermo-dynamically and kinetically possible, and the composite chromized layer on H13 steel, with a thickness of 3-6 μm, consisted of three sub-layers (bands), viz. the outer Cr-rich one, the intermediate (black) one, and the inner, original white layer. After chromizing, the former diffusion layer was thickened. The results of X-ray diffraction showed that the composite chromized layer contained such nitrides and carbides of chromium as CrN, Cr2N, (Cr, Fe)23C6, and (Cr, Fe)7C3, as well as plain α-(Fe, Cr). A high surface microhardness of 1450-1550 HV0.025, which is much higher than that obtained by the conventional ion carbonitriding and ion nitriding, was obtained. In addition, an excellent wear resistance was gained on the composite chromized layer.

关键词： H13 tool steel Low temperature composite chromizing Nitride and carbide of chromium Microhardness Wear resistance

Some features of welding arc radiation

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china Welding 1996年第2期5卷 96-101页

作者： SONG Yonglun(Prof.south china university of technology,Guangzhou,510641,china)

This investigation is an attempt to obtain quantitative knowledge of the radiation from welding arc,which includes intensity distribution,radiant energy transfer and *** attention is paid to the meaning of optical thickness of welding arc at different welding current *** may provide an useful basis for practical applications,such as ultraviolet radiation protection,information sensingfrom welding arc light,as well as temperature and density measurement in arc plasmas.

关键词： welding arc radiation optical property

A MECHANICAL MODEL FOR THE CHIP SIDE DEFORMATION IN ALUMINIUM ALLOY CUTTING

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中国有色金属学会会刊：英文版 1995年第4期5卷 168-172页

作者： Xia Wei Li Yuanyuan Zhou Zehua(Department of Mechanical Engineering,south china university of technology,Guangzhou 510641) south china Univ of technology Guangzhou China

ＡＭＥＣＨＡＮＩＣＡＬＭＯＤＥＬＦＯＲＴＨＥＣＨＩＰＳＩＤＥＤＥＦＯＲＭＡＴＩＯＮＩＮＡＬＵＭＩＮＩＵＭＡＬＬＯＹＣＵＴＴＩＮＧＸｉａＷｅｉ；ＬｉＹｕａｎｙｕａｎ；ＺｈｏｕＺｅｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈ... 详细信息

ＡＭＥＣＨＡＮＩＣＡＬＭＯＤＥＬＦＯＲＴＨＥＣＨＩＰＳＩＤＥＤＥＦＯＲＭＡＴＩＯＮＩＮＡＬＵＭＩＮＩＵＭＡＬＬＯＹＣＵＴＴＩＮＧＸｉａＷｅｉ；ＬｉＹｕａｎｙｕａｎ；ＺｈｏｕＺｅｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ...

关键词： metal cutting mechanical model cutting force chip side deformation

Estimation of underdetermined mixing matrix based on support vector machine

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Progress in Natural Science:Materials International 2007年第11期17卷 1363-1367页

作者： Yang Zuyuan and Xie Shengli(School of Electrics & Information Engineering, south china university of technology, Guangzhou 510641, china) School of Electrics & Information Engineering South China University of Technology Guangzhou 510641 China

In underdetermined blind source separation (BSS), a novel algorithm based on extended support vector machine (SVM) is proposed to estimate the mixing matrix in this paper, including the number of the active sources. Instead of traditional clustering algorithms, it mainly takes the modulus of observations and the number in each direction of arrival, without any prior knowledge about the sources except for sparsity, and it is not sensitive to the initial values. Simulations are given to illustrate availability and robustness of our algorithm.

关键词： underdetermined BSS SVM clustering

DIMPLE FORMATION ON FRACTURE SURFACE OF STEEL 55SiMnMo

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Acta Metallurgica Sinica(English Letters) 1993年第2期6卷 140-143页

作者： LIANG Sizu LIANG Yaoneng LIU Zhengyi south china university of technology,Guangzhou,china Lecturer,Department of Mechanical Engineering No.2,south china university of technology,Guangzhou 510641,china south china Univ of technology Guangzhou China

The fracture surface of the normalized steel 55SiMnMo was observed,under tensile device at- tached on the SEM,to be of ductile dimple feature on the bainite which is composed of lath ferrite and austenite *** dimple is essentially nucleated in the *** the austenitic plastic deformation is remarkable during fracturing,the tear ridge of dimple is very sharp.

关键词： dimple plastic deformation ductile fracture steel 55SiMnMo

A MECHANICS MODEL FOR CIRCULAR FORM TOOL CUTTING

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中国有色金属学会会刊：英文版 1996年第2期6卷 86-90,94页

作者： Xia Wei Li Yuanyuan Zhou Zehua (Department of Mechanical Engineering,south china university of technology, Guangzhou 510641) S china UNIV TECHNOL DEPT MECH ENGNGUANGZHOU 510641PEOPLES R CHINA

ＡＭＥＣＨＡＮＩＣＳＭＯＤＥＬＦＯＲＣＩＲＣＵＬＡＲＦＯＲＭＴＯＯＬＣＵＴＴＩＮＧＸｉａＷｅｉ；ＬｉＹｕａｎｙｕａｎ；ＺｈｏｕＺｅｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，Ｓｏｕｔｈ... 详细信息

ＡＭＥＣＨＡＮＩＣＳＭＯＤＥＬＦＯＲＣＩＲＣＵＬＡＲＦＯＲＭＴＯＯＬＣＵＴＴＩＮＧＸｉａＷｅｉ；ＬｉＹｕａｎｙｕａｎ；ＺｈｏｕＺｅｈｕａ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｃｈａｎｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＳｏｕｔｈＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆ...

关键词： metal cutting mechanical medel circular form tcol

Vector bundle constraint for particle swarm optimization and its application to active contour modeling

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Progress in Natural Science:Materials International 2007年第10期17卷 1220-1225页

作者： Zeng Delu, Zhou Zhiheng and Xie Shengli(College of Electronic and Information Engineering, south china university of technology, Guangzhou 510641, china) College of Electronic and Information Engineering South China University of Technology Guangzhou 510641 China

Active contour modeling (ACM) has been shown to be a powerful method in object boundary extraction. In this paper, a new ACM based on vector bundle constraint for particle swarm optimization (VBCPSO-ACM) is proposed. Different from the traditional particle swarm optimization (PSO), in the process of velocity update, a vector bundle is predefined for each particle and velocity update of the particle is restricted to its bundle. Applying this idea to ACM, control points on the contour are treated as particles in PSO and the evolution of the contour is driven by the particles. Meanwhile, global searching is shifted to local searching in ACM by decreasing the number of neighbors and inertia. In addition, the addition and deletion of particles on the active contour make this new model possible for representing the real boundaries more precisely. The proposed VBCPSO-ACM can avoid self-intersection during contour evolving and also extract inhomogeneous boundaries. The simulation results proved its great performance in performing contour extraction.

关键词： boundary extraction active contour modeling particle swarm optimization velocity update vector bundle.

CATHODIC REDUCTION OF METAL-CHLORIDE COORDINATION IONS

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中国有色金属学会会刊：英文版 1994年第1期4卷 39-44页

作者： Zen, Zhenou(Department of Applied Chemistry Chemistry,south china university of technology, Guangzhou510641, china)Yang, Songqing(Department of Chemistry, Central south university of technology, Changsha 410083, china)

ＣＡＴＨＯＤＩＣＲＥＤＵＣＴＩＯＮＯＦＭＥＴＡＬ－ＣＨＬＯＲＩＤＥＣＯＯＲＤＩＮＡＴＩＯＮＩＯＮＳＺｅｎ，Ｚｈｅｎｏｕ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＣｈｅｍｉｓｔｒｙＣｈｅｍｉｓｔｒｙ，ＳｏｕｔｈＣｈｉｎａ... 详细信息

ＣＡＴＨＯＤＩＣＲＥＤＵＣＴＩＯＮＯＦＭＥＴＡＬ－ＣＨＬＯＲＩＤＥＣＯＯＲＤＩＮＡＴＩＯＮＩＯＮＳＺｅｎ，Ｚｈｅｎｏｕ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＣｈｅｍｉｓｔｒｙＣｈｅｍｉｓｔｒｙ，ＳｏｕｔｈＣｈｉｎａＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎ...

关键词： cathodic reduction metal chloride coordination ions copper chloride zinc chlo-ride lead chloride chronopotential method

The phase transition and classification of critical points in the multistability chemical reactions

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Communications in Nonlinear Science and Numerical Simulation 2000年第1期5卷 36-43页

作者： Chunhua ZHANG Fugen WU Chunyan WU and Fa OU Department of Physics, Guangdong university of technology, Guangzhou510090, china Department of Applied Physics, south china university of technology, Guangzhou 510641, china Department of Physics Guangdong University of Technology Guangzhou 510090 China Department of Applied Physics South China University of Technology Guangzhou 510641 China

In this paper, we study the phase transition and classification of critical points in multistability chemical reaction systems. Referring to the spirit of Landau's theory of phase transitions, this paper deals with the varied transitions and critical phenomena in multistable chemical systems. It is demonstrated that the higher the order of the multistability, the wider the variety of phase transitions will be. A classification scheme of critical points according to the stability criterion and the thermodynamic potential continuity is suggested. It is useful for us to study critical phenomena especially in the non-equilibrium systems including the multi-Stable chemical ones.

关键词： nonlinear chemistry non-equilibrium phase transition critical points