Influence of manganese and sulphur on hot ductility of steels heated directly to temperature

This is the authors' abstract. We don't add key points for this paper.

AbstractAbstractThe hot ductility of normalised microalloyed steels having a variation in Mn and S content has been examined over the temperature range 700–1000°C after heating directly to the test temperature. Ductility troughs were generally found in the austenite and these became more severe on increasing the S content or decreasing the Mn content. The improvement in hot ductility on increasing the Mn content was found to be a result of grain refinement. Increasing the S content was also accompanied by grain refinement, but any improvement in the ductility associated with this refinement was offset by the detrimental effect of having a greater volume fraction of MnS inclusions at the γ boundaries, thereby promoting grain boundary sliding and cavitation. The hot ductility in the hot rolled state before normalising was also examined. Behaviour was found to be similar, but hot ductility was lower than after normalising owing to a coarser grain size.MST/1010