Abstract
This paper is devoted to the memory of Professor Ljubomir Nedeljkovic (1933-2020), Head of the Department of Iron and Steel Metallurgy University of Belgrade, Serbia. Assessment of the melt quality is one of the most important casting process parameters, which allowed sound production of intricated cast parts. At the present time, various devices have been applied at foundry floors to control melt quality. Thermal analysis is one of them, widely used for melt quality control in ferrous and non-ferrous casting plants. During solidification, metal and alloys released latent heat, which magnitude is dependent on the type of phases that form during the solidification process. Plotting temperature versus time data during solidification provides useful information related to the actual solidification process. The applied technique is called thermal analysis, whereas the cooling curve is the name of such a plot. The main aim of this paper is to give a short overview of the present thermal analysis application in various foundries and to indicate the future potential use of this technique.
Highlights
Application of the thermal analysis technique in the ferrous and non-ferrous casting industry for many years has been successfully employed [1, 2]
Evaluation of inoculation In cast iron foundries, thermal analysis is often used to evaluate the efficiency of added inoculant into the melt by measuring the value of eutectic undercooling [11, 16]
Added inoculant into iron melt will change the shape of the cooling curve documented in the higher eutectic temperature, as Figures 3a and 3b show
Summary
Application of the thermal analysis technique in the ferrous and non-ferrous casting industry for many years has been successfully employed [1, 2]. From the beginning of 20th century, the cooling curve analysis has been applied to determine binary phase diagrams and for fundamental metallurgical studies [3]. In using this technique, binary alloys of varying composition were studied as they cooled, and the arrest points were recorded and plotted on a temperature-composition (phase) diagram. In the middle of 20th century, Cibula [1] and Mondolfo [2], reported that the application of thermal analysis technique could be possible in the nonferrous metallurgy studying the development of the solidify structure from the test sample. In the late 1980’s, this process control technique started to be regularly used in aluminum foundries [5,6,7,8,9,10]
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