The aim of this paper is to analyze the hot working behavior of two different steels based on 3% and 5% Cr steel chemistry, respectively. Hot deformation is studied by hot torsion tests in the range of temperatures 1000-1200 ◦C and strain rates 0.01, 0.10, 1.00 s−1. At given temperatures and strain rates low curves exhibit a peak followed by a decline towards a steady state which is indicative of dynamic recrystallization. At constant strain, low stress increases with increasing strain rate and decreasing temperature. The analysis of the constitutive equation relating peak low stress, strain rate and temperature shows high activation energy values for both steels. Recrystallized volume fraction of steels after hot deformation is estimated based on the grain orientation spread as measured by electron backscattered diffraction technique, on the hot deformed and quenched materials.
Tool steels: forging simulation and microstructure evolution of large scale ingot
MENGARONI, SABRINA
;CIANETTI, Filippo;DI SCHINO, ANDREA;
2015
Abstract
The aim of this paper is to analyze the hot working behavior of two different steels based on 3% and 5% Cr steel chemistry, respectively. Hot deformation is studied by hot torsion tests in the range of temperatures 1000-1200 ◦C and strain rates 0.01, 0.10, 1.00 s−1. At given temperatures and strain rates low curves exhibit a peak followed by a decline towards a steady state which is indicative of dynamic recrystallization. At constant strain, low stress increases with increasing strain rate and decreasing temperature. The analysis of the constitutive equation relating peak low stress, strain rate and temperature shows high activation energy values for both steels. Recrystallized volume fraction of steels after hot deformation is estimated based on the grain orientation spread as measured by electron backscattered diffraction technique, on the hot deformed and quenched materials.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
