Duncan Putman

TL;DR: In this article, the processing regime relevant to superplasticity in the Ti-6Al-4V alloy was identified and the effect of grain size refinement involving recrystallisation and the formation of voids and cavities caused macroscopic softening; low ductility results.

TL;DR: In this article, the authors used modeling and targeted experimentation to quantify the processing conditions which cause recrystallization in a single-crystal superalloy and estimated the total accumulated plastic strain needed for recrestallization to be in the range of 2.

TL;DR: In this paper, the authors consider how stress/strain resulting from directional solidification can be alleviated through phenomena such as relaxation and how this can be measured, based on a modelling study, a range of stresses between 550 and 650 MPa were chosen for tensile testing at 900°C in the Ni-base superalloy, CMSX4.

TL;DR: In this paper, the inuences of dierential thermal contraction against the shell, specimen geometry and stress concentration factor are quantied to estimate the levels of localised plastic strain needed for recrystallisation to occur.

TL;DR: In this paper, numerical and thermo-mechanical modeling is carried out, with the aim of establishing computational methods by which recrystallisation during the heat treatment of single crystal nickel-based superalloys can be predicted and prevented prior to their occurrence.