The main objectiv of this experimental reserch is a comparative analysis of sulphur and oxygen effects on the cooling curves parameters at different iron melt modifying potential (residual Mg content). For the experiment, three irons with different modifying potential (0.0014, 0.0213 and 0.033 wt % residual Mg content respectively) were developed. After Ca-Ba inoculation, the three irons were additional treated by stoichiometric equivalent additions of sulphur or oxygen as FeS2 and Fe2O3 respectively. Both FeS2 and Fe2O3 sources were placed on the bottom of standard Quik-Cup moulds,usualy used for iron melt thermal analysis. The effect of sulphur and oxygen on the standard and nonconventional cooling curves parameters were evaluated to a more deep understanding of the cast iron solidification mechanism. The cooling curves parameters are strongly influenced both by the initial residual Mg level of iron melt and afterwords sulphur/oxygen additions. A very complex and sometimes confused variation of the cooling curves parameters was recorded because of different actions of the three factors (iron melt modifying potential, sulphur and oxygen). As a previous paper highlighted, sulphur addition has a strong graphite decompactizing effect while oxygen addition has mostly an inoculant effect.
The main objectiv of this experimental research is a comparative analysis of the changes caused by varying both of cooling rate and carbon equivalent content on depth of chill tendency and cooling curves parameters of grey cast irons.
The main purpose of this study is to determine by experimental research the influence both of pouring temperature and cup samples size and their filling level on the cooling curves parameters at cast iron solidification. For the experiment it follows to determine the less sensitive parameters to pouring conditions both for reduced and normal cup samples. By using two cups with different cooling modulus it was established some correlation between some variable factors such as cooling modulus, sample filling level and casting temperature and the cooling curves parameters. The experimental results released a higher sensitivity of reduced size cup (lower cooling modulus) on pouring conditions (pouring temperature and mould cup filling level).
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