COMPARATIVE STUDY OF HEAT TREATMENT CYCLES IN PRECEPITATION HARDEN NIMONIC 80A SUPERALLOY
Keywords:
Nimonic 80A, Heat treatment, continuous carbide network, gamma prime precipitates, long term creep rupture propertiesAbstract
Super alloy Nimonic 80A is the alloy from series NIMONIC nick el-base superalloys that contain 20% of
chromium it is intended for use at elevated and high temperatures at which the creep process occurs significantly. The
primary strengthening mechanism of this super alloy is based on precipitation of fine and coheren t particle of
intermetallic γ’ phase Ni3 (Al,Ti), which ensure needed creep strength. This strengthening mechanism for such super
alloy is more favorable in relation to other strengthening mechanisms. The effect of hardening that can be achieved by γ'
phase depends on amount, dispersion, and size of γ' phase. All mentioned is controlled by heat treatment.In the present
work an attempt has been made to study the effect of two different heat treatment cycles on the microstructures of super
alloy Niminic-80A.
