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Search Results: 1 - 10 of 34512 matches for " ZhenFeng Zhou "
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Wettability of CuNi-Ti Alloys on Si_3N_4 and Interfacial Reaction Products
Chuangeng WAN,Huaping XIONG,Zhenfeng ZHOU,

材料科学技术学报 , 1996,
Abstract: Based on the alloy Cu55Ni45 (at pct), holding the proportion of Cu to Ni in constant and in the temperature range of 1233~1573 K, the wetting angles of CuNi-0~56 at pct Ti alloys on Si3N4 have been measured by the sessile drop method. With the increase of Ti content, the wetting angles decreased. The equilibrium wetting angle was 5° when Ti content ≥32 at pct.In the case of same Ti content, the activity of Ti in CuNiTi alloy was weaker than that in CuTi alloy The cross-section of the CuNiTi-Si3N4 interface and the elements distribution were examined by scanning electron microscope with X-ray wave-dispersion spectrometer, and the reaction products formed at the interface were determined by X-ray diffiaction analysis method.
Development of a New Welding Material for Arc Welding of As-cast Ferritic Ductile Iron
Daqian SUN,Zhenfeng ZHOU,Jingfei LUAN,

材料科学技术学报 , 1998,
Abstract: Using the nickel welding wire, the effect of alloying elements on the chilling tendency of partial fusion zone (PFZ) of arc-welded ferritic ductile iron and the mechanical properties of weld metal have been systematically studied. On this basis a new nickel electrode for arc welding of ferritic ductile iron (QT400-17) is developed for the first time. The mechanical properties of its weld metal can match those of ferritic ductile iron. The width of carbide layer (WCL) in PFZ is significantly decreased, the welded joint has excellent machinability and the weid metal has high hot cracking resistance
Effect of Si, Al and Bi on Structure and Properties of As-welded and Austempered Ductile Iron Weld Metals during Gas Welding
Daqian SUN,Zhenfeng ZHOU,Haicheng CAO,

材料科学技术学报 , 1996,
Abstract: Effect of Si, Al and Bi on the microstructure and mechanical properties of as-welded and austempered ductile iron weld metals has been studied with SEM, TEM, X-ray diffraction, image analysing system, tension and other test methods. Results show that increasing weld Si, Al and Bi content favours improving the chilling tendency of as-welded ductile iron weld and mechanical properties of austempered ductile iron weld and the mechanism is also discussed. On this basis the optimum chemical composition of weld is determined. The mechanical properties of weld and welded joint after austempering can match those of austempered ductile iron
A Study on Improving of Incubating-Efficiency of Incubators in Zhejiang Province, China  [PDF]
Zhenfeng Ge
iBusiness (IB) , 2018, DOI: 10.4236/ib.2018.103009
Abstract: The incubator’s promotion of entrepreneurial development and the help of N.E. growth make its research have a strong practical significance. At the same time, concern for the sustainability of incubator development, the core of the problem lies in the ability to configure their incubator resources, that is, the level of incubating-efficiency. By DEA, HAC, In-depth interviews to discuss the situation in Zhejiang Province incubators, as well as influencing factors on incubating-efficiency and the improving path of the sample derived from the incubator in Zhejiang Province, which proposed a new hierarchical model and incubation Strategies for improving of incubating-efficiency.
Revision of a CCT Diagram of the Simulated ADI Weld Metal and Its Application in Actual Welding
Deyuan LI,Zhenfeng ZHOU,Daqian SUN Chengji SHAO,

材料科学技术学报 , 1998,
Abstract: A continuous cooling transformation (CCT) diagram of the simulated ADI weld metal has been developed by means of the Formastor-F diagram measurement apparatus, and revised by comparing with the actual welding. Finally the revised diagram was used to determine the welding technology
Microstructure and Wear Resistance of Ductile Cast Iron Laser Clad with Ni-Ti-Co-C
Jingfei LUAN,Jiandong HU,Zhenfeng ZHOU,Hongying WANG,

材料科学技术学报 , 1999,
Abstract: Using electrode as laser cladding materials, the microstructure and wear resistance of laser-clad layer of ductile cast iron was studied. The laser-clad layer can be subdivided into the melted zone where existed large amounts of austenite, graphite nodules and some carbide, and the solid state transformation zone which included martensite and austenite below the melted zone. The Ti combined with C to form TiC, increasing the wear resistance. The Co significantly increased the wear resistance compared with Ti.
Effect of Si, Mn and Al on the Microstructure and Mechanical Properties of ADI Weld Metal
Effect of Si,Mn and Al on the Microstructure and Mechanical Properties of ADI Weld Metal

Daqian SUN,Zhenfeng ZHOU,Wenquan WANG,Lian LIU,

材料科学技术学报 , 2002,
Abstract: The effects of Si, Mn and Al on the microstructure and mechanical properties of ADI weld have been studied. The microstructure of ADI weld metal mainly consists of bainitic ferrite and retained austenite. Mechanical properties of ADI weld increase with increasing Si content, but an excess of Si(3.79%) results in decreasing the austemperability owing to decreasing the carbon content of the matrix austenite. Mn increases the retained austenite volume fraction, but the ductility and impact toughness of weld obviously decrease with increasing Mn content because of increased amount of martenite and twin martenite. In the range of 0.13%-0.64%AI, increasing Al content favours improving the mechanical properties of ADI weld. Therefore, it is very important to select suitable Si, Mn and Al contents to improve mechanical properties of ADI weld.
Microstructural Features of Friction-Welded Ti-6Al-4V Joint
Daqian SUN,Zhenan REN,Zhenfeng ZHOU,TNorth,YANG Zhai,SSathian,

材料科学技术学报 , 2000,
Abstract: Microstructural features of friction-welded Ti-6Al-4V joint have been investigated by both optical microscope and transmission electron microscope (TEM). The microstructure of the welded joint is not uniform. It can be classified into the phase transformed region(P), the deformed region(D) and the region of unchanged base metal(B). In the phase transformed region, the microstructure consists of platelike, acicular and equiaxed alpha phase plus beta phase between them and the dislocations can be observed in some or phase particles. The equiaxed alpha phase mainly distributes in the near center of rod specimen. The quantity of platelike and acicular alpha phase and the size of the grains increase progressively along the radial direction of the rod type welded joint. In the deformed region, the grains are reoriented and the microstructure consists of the elongated alpha phase containing a lot of dislocations and intergranular beta phase.
Effects of Alloying Elements on Microstructure and Erosion Resistance of Fe-C-Cr Weld Surfacing Layer
Effects of Alloying Elements on Microstructure and Erosion Resistance of Fe—C—Cr Weld Surfacing Layer

Daqian SUN,Wenquan WANG,Zhaozhi XUAN,Yue XU,Zhenfeng ZHOU,

材料科学技术学报 , 2003,
Abstract: Effects of alloying elements on microstructure and erosion resistance of Fe-C-Cr weld surfacing layer have been studied. The experimental results show that increasing C and Cr content favors improving the erosion resistance of the layer, and the excessive C and Cr result in decreasing the erosion resistance at 90 deg. erosion. That Mo, Nb or Ti improves the erosion resistance of Fe-C-Cr weld surfacing layer is mainly attributed to increasing the amount of M7C3 and forming fine NbC or TiC in austenite matrix, but the excessive Mo, Nb or Ti is unfavorable. The addition of Mo, Nb and Ti in proper combination possesses stronger effect on improving the erosion resistance and the erosion resistance (εA) of Fe-C-Cr weld surfacing layer with fine NbC, TiC and M7C3 distributing uniformly in austenite matrix obviously increases to 2.81 at 15 deg. erosion and 2.88 at 90 deg. erosion when the layer composition is 3.05C, 20.58Cr, 1.88Mo, 2.00Nb and 1.05Ti (in wt pct).
Remote Sensing Imagery Retrieval Method Based on Visual Attention Model and Local Features

Zhou Weixun
,Shao Zhenfeng,Hou Jihu

- , 2015,
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