Effect of Addition of Ti and Al on the High Temperature Property of 60%Cr-25%Fe-15%Mo Type Alloys (Study on Cr-Base Heat Resisting Alloy, 2nd Report)

Abstract

The effects of Ti and Al on the high temperature property of 60%Cr-25%Fe-15%Mo-type alloys prepared by rapid melting in a Tamman furnace were investigated in the same manner as described in the previous report. The results obtained are summarized as follows: (1) The high-temperature properties of 60%Cr-25%Fe-15%Mo-alloys were exceedingly deteriorated by 2%Al addition. (2) The properties of the alloys were considerably improved excepting the deterioration in oxidation resistance by 2%Ti addition. (3) The high-temperature properties of the alloy with addition of 2%Ti plus 1%Al were inferior to that of the alloy with addition of only 2%Ti. (4) The creep strength remarkably increased in the case of the alloy, in which Fe was partly replaced with Co and besides 2%Ti was added.