Gravity Casting and Hot Forging of Al-Mg Alloy and Al-Mg Alloy with Fe Added

Al-4.7%Mg alloy with 0, 0.2, 0.4, 0.6 and 0.8% Fe added was cast using a copper mold and an insulator mold. The cooling rates of ingots cast using the copper mold and the insulator mold were 30.6 °C/s and 0.5 °C/s, respectively. The tensile stress and elongation of the ingots cast by the copper mold were superior to those cast by the insulator mold. The addition of Fe did not lead to tensile stress, but the elongation became smaller as the Fe content increased. The elongation of the ingot cast using the copper mold became much smaller on addition of only 0.2% Fe. The tensile stress and elongation were improved by hot forging with 50% reduction. The elongation of the ingots with Fe added was significantly improved by the hot forging. The degree of improvement of the tensile stress and elongation for the ingots cast using the insulator mold was remarkable.

Effect of Casting Conditions on Fabrication of Lotus Type Holes in Ingot Cast by Core-Bar Pulling Method

The conditions for casting ingots with lotus type through holes by a proposed core-bar pulling method were investigated. The impact of a hammer on a metal die effectively improved infiltration of molten metal into the space between the core bars. Prolonged rotation of the core bars lowered the temperature at which the bars could be pulled out.

Preparation and Magnetic Properties of Nanocrystalline FeSiAl Powder Produced with Strip Cast Ingot Process

FeSiAl magnetic powder contains high cost-performance as inductance components, which is widely used in various fields. In the present investigation the structure, magnetic properties and properties of magnetic powder cores prepared by strip cast ingot process were studied, and then compared with FeSiAl magnetic powder prepared by ingot cast broken process. The results show that strip cast sheet contained much little grain which surround with big grain, while the ingot cast broken has big grain connect with each other. For FeSiAl magnetic powder prepared by strip cast ingot process, the bigger grains were strip, the smaller grains were irregular shape, the surface of the powder was coarse, the powder prepared by strip cast ingot process was good for keeping the insulation film perfectly. For FeSiAl magnetic powder prepared by ingot cast broken, much of the powder was irregular bulk shape, and the grain corner was sharp, which is not good for insulation coating. Compared the patterns of strip cast ingot powder with the patterns of ingot cast broken powder, the diffraction peak of the patterns of strip cast ingot process powder became broaden. The initial magnetization curves of FeSiAl were obtained by vibrating sample magnetometer (VSM), observing that the saturation magnetization of strip cast magnetic powder was greater than that of ingot cast broken.

Evaluation of the Chemical Composition and Microcleanliness of the Steel Samples from the Heavy Forging Ingot

The paper presents new results obtained from the evaluation of the chemical composition, microcleanliness and structure of the 90-ton heavy ingot cast in two successive heats, in which the content of Cu and Ni was intentionally modified in order to assess the degree of mutual mixing of the two heats in the ingot volume during the steel casting and solidification. For determination of chemical composition, spectral analysis and LECO were used. Microcleanliness evaluation was carried out on a Hitachi microanalytical complex equipped with the energy-dispersive spectrometer Vantage. To assess the composition of oxide non-metallic inclusions ternary diagrams were used. Structure of the basic steel matrix was induced by etching. The evaluation showed that in the casting of two successive heats, a certain degree of inhomogeneity of chemical composition, especially in the lower part of the ingot can be assumed in case of different composition. A greater segregation of sulphur in the central top part of the ingot was also detected. However, microcleanliness of the entire ingot is in general very good with low proportions of non-metallic inclusions.