凝固鋼の熱間割れにおよぼす炭素含量の影響

概要

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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 steel 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 γ 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 γ 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.
社団法人溶接学会の論文
1973-07-25