Effect of Solidification Phase on the Toughness of steel Weld Metal (Report 2)

Effect of Fe-Ni-C peritectic reaction on the toughness of as-solidified steel

Abstract

It was shown in the previous report that the toughness of as-solidified steel was significantly influenced by the sulfur-segregation through the Fe-C peritection reaction.
For this reason, 0.1% of carbon content is a critical value for weld metal toughness.
In this report, the influence of the peritectic reaction of the Fe-Ni-C ternary system on the toughness and sulfur-microsegregation of as-solidified steel were investigated.
It was concluded that this ternary peritectic reaction had also the critical significance for the toughness of as-solidified steel and the nickel and carbon content of steel weld metal shoule be controlled under this ternary peritectic reaction, i.e. so as to solidify into only δ phase to get higher toughness.