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Casting Defects of Ti-6Al-4V Alloy in Vertical Centrifugal Casting Processes with Graphite Molds
Limin Jia,Daming Xu,Min Li,Jingjie Guo,Hengzhi Fu 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
Numerical simulation and experimental investigation are utilized to analyze the casting defects of Ti-6Al-4V alloy formed under different vertical centrifugal casting conditions in graphite molds. Mold rotating rates of 0, 110 and 210 rpm are considered in experimental process. Results show that centrifugal forces have significant effects on the quantity of both macropores and microdefects (micropores, microcracks and inclu-sions). The relative amount of all macro- and micro-scopic casting defects decreases from 62.4 % to 24.8 %with the increasing of the centrifugal force, and the macropore quantity in stepped casting decreases expo-nentially with the increase of the gravitation coefficient. The relative proportions of both micropores and microcracks decrease with the mold-rotating rate increase, but the relative proportion of inclusions increases significantly. Besides this, the mold-filling sequence is proved to be an important factor in casting quality control.