When cast iron is added with Al, the compound layer formed by reaction between cast iron and liquid Zn at 500~600℃ consists of nubby δ +Fe-Al phases instead of column δ+г phases, and the width of the compound lay...When cast iron is added with Al, the compound layer formed by reaction between cast iron and liquid Zn at 500~600℃ consists of nubby δ +Fe-Al phases instead of column δ+г phases, and the width of the compound layer increases obviously. The consumption of Fe in cast iron is dominated by the diffusive rate of Fe through the compound layer, therefore, the corrosive rate of cast iron is decreased remarkably. With increasing the content of Al in cast iron, the corrosive rate of the cast iron further decrease. For the cast iron containing 8.1 wt.% Al, its corrosive rate is ten times as low as that of general gray cast iron.展开更多
Effects of RE and Al on the structure, impact toughness, hardness, and wear resistance of high chromium cast iron containing wolfram were investigated. The results show that without modification the volume fraction of...Effects of RE and Al on the structure, impact toughness, hardness, and wear resistance of high chromium cast iron containing wolfram were investigated. The results show that without modification the volume fraction of austenite is high and the carbide appears to be thick lath and the grain size is relatively large; proper modification using RE combined with Al can reduce volume fraction of residual austenite in the as-cast structure obviously, refine grain size of primary austenite notably, and make the morphology of carbide changing from thick lath to thin lath, rosette, and feather-like modification can also increase hardness, wear resistance and impact toughness of cast iron.展开更多
The coarse Al-Si alloy produced by carbothermal reduction of aluminous ore contains 55% Al,25% Si and some impurities.The main impurities are slag and iron.The process of manufacturing casting Al-Si alloy ZL101 with t...The coarse Al-Si alloy produced by carbothermal reduction of aluminous ore contains 55% Al,25% Si and some impurities.The main impurities are slag and iron.The process of manufacturing casting Al-Si alloy ZL101 with the coarse Al-Si alloy was studied.The phase constitution and microstructure of the coarse Al-Si alloy,slag and ZL101 were examined by X-ray diffractometry and scanning electron microscopy.The results show that the content of silicon and iron in the casting alloy reduces with the increase of the dosage of purificant and manganese,but increases with the rise of filtering temperature.It is found that casting Al-Si alloy conforming to industrial standard can be produced after refining by using purificant,and removing iron by using manganese and added magnesium.展开更多
文摘When cast iron is added with Al, the compound layer formed by reaction between cast iron and liquid Zn at 500~600℃ consists of nubby δ +Fe-Al phases instead of column δ+г phases, and the width of the compound layer increases obviously. The consumption of Fe in cast iron is dominated by the diffusive rate of Fe through the compound layer, therefore, the corrosive rate of cast iron is decreased remarkably. With increasing the content of Al in cast iron, the corrosive rate of the cast iron further decrease. For the cast iron containing 8.1 wt.% Al, its corrosive rate is ten times as low as that of general gray cast iron.
文摘Effects of RE and Al on the structure, impact toughness, hardness, and wear resistance of high chromium cast iron containing wolfram were investigated. The results show that without modification the volume fraction of austenite is high and the carbide appears to be thick lath and the grain size is relatively large; proper modification using RE combined with Al can reduce volume fraction of residual austenite in the as-cast structure obviously, refine grain size of primary austenite notably, and make the morphology of carbide changing from thick lath to thin lath, rosette, and feather-like modification can also increase hardness, wear resistance and impact toughness of cast iron.
文摘The coarse Al-Si alloy produced by carbothermal reduction of aluminous ore contains 55% Al,25% Si and some impurities.The main impurities are slag and iron.The process of manufacturing casting Al-Si alloy ZL101 with the coarse Al-Si alloy was studied.The phase constitution and microstructure of the coarse Al-Si alloy,slag and ZL101 were examined by X-ray diffractometry and scanning electron microscopy.The results show that the content of silicon and iron in the casting alloy reduces with the increase of the dosage of purificant and manganese,but increases with the rise of filtering temperature.It is found that casting Al-Si alloy conforming to industrial standard can be produced after refining by using purificant,and removing iron by using manganese and added magnesium.