Age-Hardening Characteristics of Nickel-Base Heat-Resisting alloys
Studies on Nickel-Base Heat-Resisting Alloys-I
1959 Volume 45 Issue 1 Pages 40-45
Details
1959 Volume 45 Issue 1 Pages 40-45
Age hardening characteristics of nickel-base heat-resisting alloys were studied comparing with carbide precipitation type heat-resisting alloys. Age-hardening of nickel-base heatresisting alloys is much faster and more remarkable than carbide-precipitation-type alloys.
Hardness after aging is above B.H.N. 300 within 10 hours at 750°C, though solution-treated hardness is below B.H.N. 230. Maximum aging hardness is attained at 750°C, and above this aging temperature the coaguration of precipitates becomes remarkable and aging hardness falls down.
As the amount of Ti, Al and Nb increases, hardness after aging or solution-treatment increases. Addition of Mo increases aging-hardness of Ni-Cr-Co alloys, though it does not affect to Ni-Cr alloys. Co, also, does not affect the hardness after aging or solution-treatment.
