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DEVELOPMENT OF POLYMER MINERAL COMPOSITE AND ITS DAMPING PROPERTY

J.Sun 1) , J.F.Li 2) , B.J.Lu 1) , J.F.Zhong 3) and X.P. Huang 1) 1) Dept. of Agri. Eng. , Laiyang Agriculture College , Laiyang 265200 , China 2) Dep. of Mech. Eng. , Shandong University of Technology , Jinan 250061 , China 3) Agruculture Scientific Institude of Linyi , Linyi 276200 , China

金属学报(英文版)

The principle of production of polymer mineral composite was analyzed. Property parameters and the procedure for producing PMC components were also given. Damping property and principle of vibration absorption of polymer mineral composite were also investigated. Reduced experiment was conducted for two jigs which are similar in structure only different in material that one made of PMC the other made of casting iron to test their dynamic characteristic.

关键词: polymer mineral composite , null , null , null

STUDY OF THE NUCLEATION MECHANISM OF α-Al GRAINS AFTER ADDITION OF Al-Ti-B MASTER ALLOYS

X.F. Liu , X.F. Bian , X.G. Qi , M. Thompson and J.J Ma (Colledge of Materials Science and Engineering , Shandong University of Technology , Jinan 250061 , China)

金属学报(英文版)

Nucleation sites of α-Al grains after addition of an Al-Ti-B master alloy into pure aluminium have been investigated using EPMA. The results show that either TiAl3 or boride particales can nucleate α-Al grains. But the number of TiAl3 nucleants is reduced with the holding time prolonged and the boride-nuclei are increasing gradually. Based on these results, a new refining method, adding molten Al-Ti-B into commercially pure aluminium, which has a quicker and better refining efficiency is presented.

关键词: Al-Ti-B master alloy , null , null , null

Microstructure and Fracture Morphology in the Welding Zone of Cr18Mo2 Ferritic Stainless Steel

Yajiang LI , Zengda ZOU and M. Thompson (Dept. of Materials Engineering , Shandong University of Technology , Jinan 250061 , China)(To whom correspondence should be addressed)

材料科学技术（英）

Microstructure, precipitates and fracture morphology in the weld metal and the heat-affected zone (HAZ) of Cr18Mo2 ferritic stainless steel have been studied by means of metalloscope, SEM,TEM and X-ray diffractometer. Experimental results indicate that crystalline grain coarsening in HAZ is one of the reason resulting in the embrittlement fracture in the welding zone of the ferritic stainless steel. Some precipitates (TiC, TiN and Cr2N) in the steel promote production and development of the brittle cracks. In practical applications. the welding heat input should be as small as possible to prevent embrittlement caused by HAZ grain coarsening.

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FABRICATION AND PROPERTIES OF CERAMIC CEMENTED CARBIDE COMPACT INSERTS

J.Q.Zhou , X.Ai , Z.Q.Li and C.Z.Huang Institute of Mechanical Engineering , Shandong University of Technology , Jinan 250061 , China

金属学报(英文版)

A novel ceramic cemented carbide compact insert was developed using hot pressing sintering technique. The surface layers of the sandwich material were ceramic and the middle layer was cemented carbide. The factors that affect the properties of the compact insert were analyzed. Theoretical analyses and experiments indicated that the cemented carbide with greater elastic module and thermal expansion coefficient than ceramic should be used in the sandwich material in order to get high equivalent flexure strength and the geometric parameters of the compact insert are also important to its properties.

关键词: compact insert , null , null , null

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