Authors: Tomasz Wejrzanowski, Krzysztof Jan Kurzydlowski
221
Authors: Yun Zhong Wu, Yong Qing Ma, Hong Tao Gao, Yang Zhang, Shi Yong Liu
Abstract: By application of clad-bonding technique of pure copper sheet and plain low carbon steel
rebar Q195, the cladding wires in different diameter by drawing at room temperature have been
worked. The increasing ratio of the area of grain boundary is in direct proportion to deformation
approximately. The resistivity of the cladding wires go up in direct proportion to deformation
because the increment of the area of grain boundary results in increment of static disfigurement to
electron dispersion. When deformation is less 9.6, the relative increment of resistivity is less 1.1%,
i.e. the wire is provided with good electrical conductivity. And the resistance and resistivity of the
wires can be estimeted based on copper ratio of transverse section of the cladding wire and the
deformation by drawing at room temperature.
321
Authors: Xiao Cun Xu, Zhe Jun Yuan, Bing Lin
Abstract: Since almost large die surfaces are free-form surfaces, currently, these are almost manually
implemented. In order to overcome this barrier, floating polishing is a feasible polishing technology.
The contact pressure between grain and workpiece is a key problem of floating polishing technology.
This paper focuses on contact pressure between grain and workpiece. At first, study the friction bound
condition between grain and workpiece by ANSYS analysis software, then, compare with the analysis
results of slip-line field theory and the test results of single grain. The results show the feasibility of
the hypothesis of full friction condition. Finally, study the contact pressure between polishing disk
and workpiece using the analysis results of single grain. The research achievements will be used for
developing the floating polishing.
161
Authors: Xin Zhao, Xiao Ling Yang
Abstract: This paper analyzed the microstructure evolution and grain-refining mechanism in producing ultra-fine grained steel sheet by heavy rolling of lath martensite. The results show that this technique is composed of three processes with different grain-refining mechanism respectively: i) austenite grains subdivide into homogeneous and tiny martensite laths during quenching; ii) martensite laths are thinned and damaged during heavy rolling; iii) equiaxed ultra-fine ferrite forms during low temperature recrystallization annealing.
1701
Authors: Pan Li, Zhang Jian, Xu Ma
Abstract: The subject of study is the vertical extrusion of P91 large diameter thick-walled seamless steel tube, simulate the variation of microstructure during the abbreviated ratio test. Compare the simulation results and the results of Steel pipe specimens metallographic which were in different extrusion ratio, research the influence of extrusion ratio on microstructure and properties from micro-organizational level, and verify the accuracy of the microstructure evolution of the mathematical model.
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