摘要:In this paper,the stress-strain mathematical equation during solidification process of Al-Si alloy castings was obtained, based on the experimental study of the semisolid mechanical and rheologic properties of the alloy.A numerical simulation program of the thermal stresses of 3-D axisymetric Al-Si alloy castings has been developed, which can be used to solve the thermoelastoviscoplasticity problem related to the high temperature mechanical properties of the material. The behavior of Al-Si alloy casting with a hot spot predicted by computation was consistent with the experimental results.
摘要:The behaviors of inclusions and hydrogen in molten aluminium were analysed,and the mechanism between inclusions and hydrogen in molten aluminium which had been testified by means of the study on the purification of aluminium scraps was advanced.The authors held that hydrogen parasitized on inclusions and inclusions absorbed hydrogen,removing inclusions form molten aluminium is the fundamental step of eliminating hydrogen.The effect of the technique of the purifiction of flux filtration is remarkable,so we should attach great importance to the techmque.
关键词:Interaction between inclusions and hydrogen;Purification of molten aluminium;Flux filtration
摘要:The process and mechanism of the change of rich-Si phase in binary hypoeutectic and eutectic Al-Si alloys during a Period of holding elevated temperature have been investigated. Experimental evidence shows that solution homogenization, ripening,α-β inteface energy and the characteristic of rich-Si phase play imPOrtant roles.The way to gain fine and spheical rich-Si is to carry on a proper heat treating after refining and modification.
关键词:Al-Si alloy;Holding elevated tempature;Change of rick-Si Phase
摘要:A Shell-making process of investment casting using Mg-olivine sand(and flour)instead of silica sand(and flour)was studied.comparing to the silica sand(and flour)shell,the Mg-olivine sand(and flour)shell has higher room-temp. and high-temp.strength,lower retained strength and lower rates of expansion and deformation. A better casting quality was obtained.
摘要:A water-base strippable full mold coating has been developed with the help of orthogonal design method. Different kinds of experiments and productive practice proved that the technolongical property is fine and the cost is cheapper,the coating doesn’t pollute the environment,so it is valuable for wide uage.