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
Z. F. Wan
,
X.D. Hui
,
G.Q. Yuan
,
Y. S. Yang and X.C Chen (Shandong University of Technology
,
Jinan 250061
,
China)(Institute of Metal Research
,
The Chinese Academy of Sciences
,
Shenyang 110015
,
China)(Institute of Physics
,
The Chinese Academy of Sciences
,
Beijing 100080
,
China)
金属学报(英文版)
The initiation and propagation of the short fatigue crack in a 10vol% titanium carbide particulate reichreed cast Fe-26Cr-14Ni mathe coopsite at 1023K were investigated.It is shown that the titanium carbide particulate may hinder the crack propagation and fatigue fracture of the composite. The relationships between fatigue crack propagation rate and stress intensity factor are da/dN=4.2×10-c(△K)4 for the matrix alloy and da/dN=1.4×10-19(△K)c for the composite. The fatigue thresholds of the composite and mathe alloy are 78 and 3.2MPa.m1/2, respectively. Microcracks initiate at the intedece between titanium carbide particulate and austenite and then propagate in carkide particles. The fracture sudece of the composite shows a distinct transition from wavy and serated cleavage near the threshold regime to striation-type splitting in the stable fatigue crack propagation stage and to a veined morphology characteristic in unstable rapid region.
关键词:
fatigue crack
,
null
,
null
,
null
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
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
