Short Communication
Effect of double-hit deformation on the onset of critical stress for the
initiation of dynamic transformation
K. Chadha1*, C. Jr. Aranas2, M. Zaid
Ahmed3, M. Jahazi4, J.G.
Spray1
1Planetary and
Space Science Centre, University of New Brunswick
Fredericton, New Brunswick E3B 5A3, Canada
2Department of
Mechanical Engineering, University of New Brunswick
Fredericton, New Brunswick E3B 5A3, Canada
3Regional
Technological Institute University of West Bohemia, Plzeň, 30100, Czech
Republic
4Department of Mechanical Engineering, École de
technologie supérieure (ÉTS),
1100 Notre Dame Street West, Montréal, Québec H3C 1K3, Canada
*Corresponding author: Kchadha@unb.ca
Abstract
Double-hit hot compression tests were carried on medium-carbon low-alloy
steels using Gleeble 3800® thermomechanical simulator.
The tests were performed at strain rates of 0.25 and 0.5
s-1 and temperatures of 1150 and 1200 °C with an
interpass time of 5s. The onset of critical stress for dynamic
transformation (DT) were detected using the double‐differentiation
method. This metallurgical phenomenon was initiated under all testing
conditions. The results show that the critical stress for DT increases
with decrease in temperature and increase in strain rate.
Keywords: Dynamic Transformation; Thermomechanical Processing;
Double-hit deformation.