Heat resisting controlled thermal expansion alloy balanced for having globular intermetallic phase

摘要

A heat resisting, controlled thermal expansion, nickel-iron base alloy consisting essentially of, in weight percent, about: -C 0.1 max. -Mn 0.5 max. - a small but - effective amount up to -Si 0.7 -P 0.015 max. -S 0.010 max. -Cr 0.8 max. -Ni 32-52 -Mo 0.5 max. -Co 0-20 -Ti 1-3 -Al 0.2 max. -Nb 5-7 -V 0.5 max. -Zr 0.1 max. -B 0-0.02 -Cu 0.8 max. -W 0.5 max. -Fe Bal. - and an article formed therefrom are disclosed. The alloy provides an outstanding combination of elevated temperature tensile properties and notch rupture ductility by close control of the niobium and titanium in the alloy. Within the compositional range of the alloy niobium and titanium are balanced such that (a) % Nb>/=6.7-0.5(% Ti), for Ti/=18.3-8.2(% Ti), for Ti>/=1.5%; and (c) % Ti