抄録
In order to clarify the effect of impurities contained in sinterforged irons on the mechanical properties, studies were carried out under various conditions using five kinds of iron powder.
With the increase of the amount of nonmetallic inclusions, the tensile strength was little affected, but the elongation and reduction in area were linearly decreased, and the impact strength was more remarkably decreased. The impact strength was also affected by forging temperature and heating atmosphere. A peculiar phenomenon was observed in the sinterforged irons made at 900°C, in which the upper yield strength was higher than the ultimate tensile strength in the stress-strain curve.
