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Influence of Cooling Conditions in Casting cu-ni alloy Based on Numerical Simulation

Journal of Wuhan University of Technology(Materials Science) 2010年第1期25卷 68-72页

作者：庞玉华 School of Metallurgy Engineering Xi'an University of Architecture &Technology

The most common and serious defect in cu-ni alloy casting is porosity. To solve the problem, accurate casting design and proper design of gating system are necessary. It can be predicted and designed by means of computer simulation of casting solidification. Based on the casting process of the cu-ni alloy, the simulation software of diathermanous—flowing—stress coupling ProCAST was used to simulate the cu-ni alloy solidification process about the defects and temperature field. By combining experimental results with the simulation results, the quality of casting on some cooling conditions were analyzed. Furthermore, a better cooling condition for solidification process of the cu-ni alloy was chosen to improve the quality of the casting. The simulation results indicate that the quality of cu-ni alloy casting is the best when it is on the cooling condition of the permanent mold with the insulated riser system.

关键词： cooling condition cu-ni alloy solidification numerical simulation proCAST

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INFLUENCE OF THE MICROSTRUCTURE OF cu-ni alloy ON ITS CORROSION RESISTANCE

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Transactions of Nonferrous Metals Society of China 1992年第4期2卷 51-55页

作者： Zhu Xiaolong General Research Institute for Nonferrous Metals Beijing 100088China

The microstructures of two kinds of cu-ni alloys were observed by *** results show that one of the alloys is a homogeneous solid *** other contains discontinuous precipitates at some grain boundaries,and the precipitate is a phase rich in *** monitoring the corrosion potential(E_(con))in artifical seawater and exposure to natural seawater for a long time,it is found that the E_(con)of the former alloy steadily decreases,while the E_(con)of the latter decreases a little and fluctuates,and the corrosion rate of the former is clearly lower than that of the *** of SEM and EDX show that the corrosion product film of the former is thin,uniform,compact and rich in nickel,and the film of the latter is thick,loose and covered with numerous *** serious intergranular corrosion occurs in the underlying substrate of the *** author proposes that the intergraular corrosion results from preferential dissolution of discontinuous precipitates at grain *** addition,the protective characteristics of corrosion product films are related not only to the enrichment of nickel but also to their compactness.

关键词： cu-ni alloy microstructure corrosion resistance seawater corrosion potential corrosion product film

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Influence of Extrusion Temperature on Microstructures and Properties of cu-17ni-3Al-X alloy

Influence of Extrusion Temperature on Microstructures and Pr...

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中国材料大会2012

作者： Wei Tan Yuanhui Weng Zongqiang Luo Weiwen Zhang School of Mechanical ＆ Automotive Engineering South China University of Technology

ISBN: (纸本)9783037856093;3037856092

The microstructures and mechanical properties of the cu-17ni-3Al-X alloy extruded at different temperatures were investigated by hardness and tensile tests,optical microscope and scanning electronic *** experimental results showed that dynamic re-crystallization occured during the hot extrusion at 1000 ℃.The grain size of the extruded alloy was significantly refined and the mechanical properties increased remarkably compared to the as-cast *** alloy extruded at 1075 ℃ exhibited good mechanical properties with tensile strength of 994 MPa,Brinell hardness of 296 and elongation of 8.0%,which are 30%,9% and 285% higher than that of the as-cast alloy.

关键词： cu-ni alloy Extrusion temperature Mechanical property Microstructure.

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Protective Characteristics and Formation Mechanism of the Corrosion Product Films of B30 Tubes Exposed to Seawater

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Journal of Materials Science & Technology 1992年第3期8卷 192-196页

作者：朱小龙林乐耘 Surface Technology Center General Research Institute for Nonferrous MetalsBeijing110083China To whom correspondence should be addressed Surface Technology Center General Research Institute for Nonferrous MetalsBeijing110083China

The corrosion product films of two kinds of B30 tubes(similar to CDA 715)exposed to seawat- er for various periods of time were investigated by SEM,AES and *** results show that the pro- tective corrosion product film is thin,uniform and *** is found to be present in the film surface,which confirms the hypothesis that iron hydroxide segregates at the surface of the *** FeOOH promotes ni enrichment in the corrosion layer by preventing ni from running *** corro- sion product film with no protectiveness is of lay- ered structure,loose and bad *** for- mer film is formed through direct oxidation and the latter by precipitation and redeposition from dis- solved species.

关键词： cu-ni alloy corrosion product film exposure

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