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Effects of thermal parameters, microstructure and morphology of Si on Machinability of Al-7.0   directionally solidified weight percentage Si alloy

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Document pages: 12 pages

Abstract: The purpose of this study is to combine thermal and microstructure parameters (such as growth rate and cooling rate (VL and TR) and secondary dendrite spacing( λ 2) ) respectively related to the effects of machining temperature and tool wear on Al-7 Necking Process   weight percentage silicon alloy solidified in horizontal orientation device using high-speed steel and tungsten tools. λ 2 dependence on VL and TR and maximum cutting temperature and maximum flank wear λ The dependency of 2 is determined by λ The power experimental law given in 2 determines   =   constants (VL and TR) n and Tmax, Vmax   =   constants( λ 2)n。 Maximum cutting temperature with λ 2 increased with the increase of. The maximum flank wear is the opposite. The effect of silicon alloy elements on the above results was studiedlso been analyzed. A morphological change of Si along the solidified ingot length has been observed, that is, the morphology of Si in the eutectic matrix has indicated a transition from particles to fibers along the casting together with an increase of the particle diameters with the position from the metal mold interface.

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