JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
Effect of Carbon Content on the Hot Cracking in Solidified Steel
Isao MasumotoHironori Ozaki
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1973 Volume 42 Issue 7 Pages 674-684

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Abstract

In order to clarify the effect of the peritectic reaction in Fe-C system on the hot cracking in steel weld metal, the hot cracking tendency of the solidified steel specimens, of which carbon content were in the range of 0.01-0.54%, were investigated by means of the simple cast tear tests. The microsegregations in the cast steeel specimens were also examind by the electron-probe microanalyser.
It was found that the hot cracking tendency of the solidified steel specimen with more than 0.1% of carbon content increases remarkably, because the sulphur is more segregated during solidification.
This could be explained as follows;
Through the peritectic reaction the crystallized δ iron has the surface skin of r iron, of which sulphur solubility is much lower than that of δ iron, and the solidification may terminate while the sulphur-enriched melt is sorrounded by r phase.
Therefore it is important for the prevention of the hot cracking in steel weld metal to keep the carbon content under 0.1% as well as to reduce the sulphur content.

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