The hot ductility of low-carbon killed steels has been Jtudied by the hot tensile tests, microscopic observations, and the frac ture surface observations .The ductility during cooling after solution treatment at 1 350°C decreased remarkably in the temperature range between 700° and 800°C and the fracture surface showed the intergranular ductile fracture accompanied with AlN or MnS precip itates.This loss of ductility is related to the formation of the primary ferrite along the austenite grain boundaries and the precipitation of AlN or MnS particles at the grain boundaries, and becomes very large when it occurs concurrently.The intergranular ductile fracture can be induced by the micro-void coalescence nucleated at the grain boundary precipitates as the result of strain concentration at the .filmlikeprimary f errite formed along the austenite grain boundaries .
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Yamanaka et al. (1980) studied this question.