Analise termica na solidificação de ferros fundidos cinzentos hipoeuteticos / Thermal analysis on solidification of hypoeutectic gray cast iron

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Thermal analysis is a widely used method for metallurgical process control and investigation of alloy composition of cast irons in foundry practice. A reliable means of rapidly evaluating the composition of cast irons is available by the Carbon-Equivalent technique, which is based on the change in thermal arrest temperature of the liquidus as the sample of molten cast iron freezes. The present work focuses on the development of a new sensor for thermal analysis, a dip-sensor, wich aims to contribute to more reliable determination of alloy composition during casting operation. Experiments were carried-out in different foundries by using both the dipsensor and the traditional capsule-sensor, which is normally used in foundry practice. The comparison of alloy compositions measured by these two techniques with analysis performed by Arc/Spark spectrometry has shown that generally the dip-sensor provides more reliable results. Thermal analysis conducted during cooling of molten cast iron in a unidirectional chill apparatus, by using a set of thermocouples, has also permitted the quantitative determination of solidification thermal variables, such as: transient metal/mold and mold/ambient heat transfer coefficients and tip cooling rates

ASSUNTO(S)

solidificação cast iron ferro fundido thermal sensors metais fundidos - propriedades termicas analise termica solidification liquid metals thermal analysis unidirectional solidification thermal variables

ACESSO AO ARTIGO

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