Effect of Temperature on Tensile flow behaviour of Nimonic C-263 alloy

Tensile properties, deformation and flow behaviour of Ni base superalloy, Nimonic C-263, was studied at modified solutionizing and aging condition, in the temperature range of 25-650 degrees C and at a strain rate of 1.3x10(-3)S(-1). The presence of Dynamic strain aging (DSA) behaviour was observed at a wide temperature regime of 200 degrees C to 600 degrees C. Also an anomalous variation in tensile properties was observed in the temperature ranges between 400 degrees C to 650 degrees C. The yield strength (Y.S) was decreased slightly with temperature up to 300 degrees C and from there, there is a peak in YS at 400 degrees C with minimum(%) of elongation and strain hardening rate is maximum at 400 degrees C. An attempt has been done in this paper, to Co-relate the mechanical properties and flow behaviour of the alloy with microstructral studies and flow equations at different temperatures. It is observed that Ludwigson equation provides the best fit at high temperature, at 650 degrees C, compared to Hollomon and Ludwik equations. (C) 2017 Elsevier Ltd. All rights reserved.