The Effects of Excess Aluminum on Mechanical Properties of Mn-Mo, Mn-Mo-Ni and Mn-Mo-Ni-Cr Steels with Regard to Solute Interactions

Abstract

Mechanical properties have been studied through the changes of Al and N contents in Mn-Mo, Mn-Mo-Ni and Mn-Mo-Ni-Cr steels with regard to solute interactions between alloying elements by means of Charpy V-notch impact tests, tensile tests and microscopical observations.
The results show that the low-temperature toughness is anomalously deteriorated in Mn-Mo and Mn-Mo-Ni steels but indistinctly related in Mn-Mo-Ni-Cr steel by an increase of excess Al. It is also shown that the tensile strength is remarkably increased, slightly increased and not increased at all by an increase of excess Al in Mn-Mo, Mn-Mo-Ni and Mn-Mo-Ni-Cr steels, respectively.