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Journal of Materials Science & Technology 2006年第1期22卷 50-54页

作者： Pengfa FENG Jinglin TANG Xinyan JIN Shuangshou LI daben zeng Depaxtment of Mechanical Engineering Tsinghua University Beijing 100084 China

The influences of preparation conditions of Al-5Ti-B （as-cast and hot-rolled） and Al-10Sr （as-cast and hotextruded） and melt treatment procedures on the grain refinement and modification performance of A356 alloy are experimentally studied. For the two master alloys, the 50% reduction is sufficient to meet the demands of the efficient grain refinement and modification of A356 alloy. When Al-STi-B is introduced into the melt prior to degassing, the grain refinement efficiency of Al-5Ti-B will be greatly increased due to the better dispersity of TiB2 particles. Al-5Ti-B master alloy is less prone to affect the modification effect of Al-10Sr when they are used together.

关键词： Grain refinement Modification Hot deformation Master alloys A356 alloy

RESEARCH AND APPLICATION OF AS-CAST WEAR RESISTANCE HIGH CHROMIUM CAST IRON

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Chinese Journal of Mechanical Engineering 1998年第2期11卷 51-56页

作者： Liu, Jinhai Liu, Gensheng Li, Guolu Wang, Kunjun zeng, daben Hebei Univ of Technology China

The influence of alloy elements, such as boron and silicon, on the microstructure and properties of as cast high chromium cast iron is studied. The results show that boron and silicon have a great effect on the mechanical properties and the wear resistance. Through proper addition of boron and silicon, the properties of as cast high chromium cast iron can be improved effectively. Through analyzing the distribution of elements by scanning electron microscope, it has been shown that the addition of boron and silicon lowers the mass fraction of chromium saturated in as cast austenite, and makes it unstable and liable to be transformed into martensite. The as cast high chromium cast iron with proper content of boron and silicon is suitable for the manufacture of lining for asphalt concrete mixer and its wear resistance is 14 times that of lining made of low alloy white cast iron.

关键词： High chromium cast iron Hardness Wear resistance Impact toughtness Lining

Effect of Relative Reduction on Property of Steel-Mushy Cu-Graphite Composite

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Journal of Materials Science & Technology 2005年第4期21卷 589-592页

作者： Peng ZHANG Yunhui DU Hanwu LIU daben zeng Jianzhong CUI Limin BA Department of Mechanical Engineering Beijing 3iaotong University Beijing 100044 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China Metal Forming Department Northeastern University Shenyang 110004 China Anshan Automobile Fittings Factory Anshan 114014 China

The rolling treatment of steel-mushy QTi3.5-3.5 graphite composite was conducted under different relative reduction at room temperature. The effect of room-temperature rolling on interracial mechanical property of steel-mushy QTi3.5-3.5 graphite composite was studied and the relationship between interracial shear strength and relative reduction was established. The results show that, for steel-mushy QTi3.5-3.5 graphite composite, which consists of 1.2 mm-thick 08AI steel plate and 2.8 mm-thick QTi3.5-3.5 graphite layer, there is a nonlinear relationship between interracial shear strength and relative reduction in graphite layer. When relative reduction is smaller than 1.1%,interracial shear strength increases with increasing the relative reduction. When relative reduction is larger than 1.1%, interracial shear strength decreases with increasing the relative reduction. When relative reduction is 1.1%,the largest interracial shear strength of 145.2 MPa can be obtained.

关键词： Rolling Relative reduction Interracial shear strength Steel-mushy Cu-graphite composite

Semi-solid Processing of Al-7Graghite Composite

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Journal of University of Science and Technology Beijing 2001年第3期8卷 203-206页

作者： Peng Zhang, Yunhui Du, daben zeng Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Al-7graphite composite was processed using Al-7graphite mushy prepared by electromagnetic-mechanical stirring method, and the influence of solid fraction on the distributing of graphite particles in ingot was studied. The results shows that the relationship between solid fraction and stirring temperature of mushy is: f(s) = 591.5-0.897 t (where f(s) is the solid fraction, t is the stirring temperature). For Al-7graphite composite, with the increasing of solid fraction, the aggregation extent of graphite particles reduced gradually, and when solid fraction was larger than 30%, graphite particles could distribute evenly in ingot.

关键词： Al-7graphite composite electromagnetic-mechanical stirring method distributing of graphite particles solid fraction stirring temperature

Influence of Pressing Time on Steel-copper-graphite Bonding

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Journal of Materials Science & Technology 2006年第2期22卷 235-238页

作者： Peng ZHANG Yunhui DU Hanwu LIU Jun ZHANG daben zeng Jianzhong CUI Limin BA Department of Mechanical Engineering Beijing Jiaotong University Beijing 100044 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China Metal Forming Department Northeastern University Shenyang 110506 China Anshan Automobile Fittings Factory Anshan 114014 China

The bonding of steel plate with QTi3.5-3.5 graphite slurry was studied by using pressing bonding technique. The influence of pressing time on the interracial mechanical property of bonding plate was researched. The results show that： under the conditions of 620℃ preheating temperature of steel plate, 530℃ preheating temperature of dies, 46% solid fraction of QTi3.5-3.5 graphite slurry and 50 MPa pressure, there exists a nonlinear relationship between pressing time and interracial shear strength. The interracial shear strength of bonding plate increases with increasing pressing time and reaches a largest value about 127 MPa when pressing time is longer than 120 s. At the interface with the best mechanical property, there exists a continuous Fe-Cu inter-diffusion zone and a metallurgical bonding.

关键词： Steel-copper-graphite bonding Pressing time Interracial shear strength

Study on Bonding of Steel-mushy Al-7graphite

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Journal of University of Science and Technology Beijing 2001年第4期8卷 283-285页

作者： Peng Zhang, Yunhui Du, daben zeng Department of Mechanical Engineering Tsinghua University. Beijing 100084, China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

The bonding of steel-mushy Al-7graphite was studied. The relationship between interfacial shear strength of bonding plate and solid fraction of Al-7graphite mushy was obtained, and the interfacial structure of bonding plate was determined. The results showed that: under the condition of 500 degreesC for preheat temperature of steel plate and 10 mm/s for rolling speed, the largest interfacial shear strength of bonding plate was 70.1 MPa when solid fraction of Al-7graphite mushy was 34.6%.

关键词： interfacial shear strength solid fraction interfacial structure

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异军突起的镁合金压铸

特种铸造及有色合金 2000年第6期20卷 55-57页

作者：张鹏曾大本清华大学机械工程系 100084 清华大学

介绍了国外发达国家和地区镁合金压铸的发展。

关键词：镁合金压力铸造

Study on Steel-Mushy Al-20Sn Alloy Bonding

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Journal of Materials Science & Technology 2001年第2期17卷 224-228页

作者： Peng ZHANG, Yunhui DU and daben zeng Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China Jianzhong CUI Metal Forming Department, NEU, Shenyang 110006, China Limin BA Anshan Automobile Fittings Factory, Anshan 114014, China Dept. of Mech. Eng. Tsinghua Univ. Beijing 100084 China

Steel-mushy Al-20Sn alloy bonding was studied for the first time. The relationship model about preheat temperature of steel plate, solid fraction of Al-20Sn alloy mushy, rolling speed and interfacial shear strength of bonding plate could be established by artificial neural networks perfectly. This model could be optimized with a genetic algorithm. The optimum bonding parameters were: 505 degreesC for preheat temperature of steel plate, 34.3% for solid fraction of Al-20Sn alloy mushy and 10 mm/s for rolling speed, and the largest interfacial shear strength of bonding plate was 71.2 MPa.

关键词： Al Sn Study on Steel-Mushy Al-20Sn Alloy Bonding

Rheologic behaviors of A356 aluminum alloy billet produced by semisolid continuous casting process

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China Foundry 2004年第1期1卷 62-66页

作者： Shuming Xing Lizhong ZHANG Yunhui DU daben zeng Jinlin TANG Department of Mechanical Engineering Beijing Jiaotong University Beijing 100044 P.R. China Department of Meclanical Engineering Tsinghua University Beijing 100084 P.R.China

The experiments for rheologic behaviors of semisolid continuous casting billets of A356 alloy in semisolid state had been carried out with a multifunctional rheometer. The results show that the deformation rate increases with loading time, the maximum strain reaches to 120％ (which is one time larger than that of traditional mold casting billet) and the strain can be rapidly eliminated to 10％ after unloading. Moreover, there is a critic stress for billet deformation even in semisolid state, which is named as critic shear stress. This stress increases with the decreasing of heating time. The theologic behaviors can be expressed by five elements mechanical model (H_2- [N_1|H_2]-[N_2|S]) and can be modified with the increasing of heating time.

关键词： semisolid continuous casting billet aluminum alloy rheologic behavior

AlSi7Mg合金坯料在固液两相区的初始结构对变形的影响

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金属学报 2000年第3期36卷 247-250页

作者：陈晓阳曾大本钟雪友清华大学机械工程系北京100084 北京科技大学铸造研究所北京100083

本文论述了ＡｌＳｉ７Ｍｇ合金在半固态状态下的初始结构对压缩变形行为的影响．结果表明：ＡｌＳｉ７Ｍｇ合金坯料的初始显微结构的固相颗粒尺寸及分布、颗粒形貌、颗粒团聚化程度对半固态合金坯料的表观粘度有重要的影响具有初始细... 详细信息

本文论述了ＡｌＳｉ７Ｍｇ合金在半固态状态下的初始结构对压缩变形行为的影响．结果表明：ＡｌＳｉ７Ｍｇ合金坯料的初始显微结构的固相颗粒尺寸及分布、颗粒形貌、颗粒团聚化程度对半固态合金坯料的表观粘度有重要的影响具有初始细枝晶结构（蔷薇状结构）的合金应力水平较低，具有中等枝晶和粗枝晶结构的合金应力水平较高．非枝晶组织半固态合金变形时固相颗粒变形力的传递数学模型为：

关键词：初始结构半固态区间触变变形铝合金