EFFECTS OF MELTING TREATMENTS ON THE MECHANICAL PROPERTIES OF REVERTED DZ40M ALLOY

Reverted DZ40M alloy was refined by melting treatment(MT) which tensile,stress- rupture and creep properties were measured.MT can reduce the content of N from 0.0078%to 0.0024%, as well as the content of S from 0.0015%to 0.0007%.It makes impurity elements such as N,O and S being removed,and the shrinkage area being decreased.MT improves the tensile strength and ductility of reverted DZ40M alloy,especially elongations at room temperature and 1000℃are increased about twice as high as those by regular melting(RM).In addition MT prolongs the stress-rupture lives,and improves the creep properties of reverted DZ40M alloy.Therefore stress-rupture and creep properties of reverted DZ40M alloys are upgraded greatly.