Y.V.R.K. Prasad

Hot working characteristics of nimonic 75, 80A and 90 superalloys: a comparison using processing maps

The hot-working characteristics of Nimonic 75, 80A and 90 are studied in the temperature range 850-1200°C and strain rate range

Influence of oxygen on dynamic recrystallization during hot working of polycrystalline copper

0.001-100s^{-1}

An evaluation of rate-controlling obstacles for low-temperature deformation of zirconium

using hot-compression tests. Processing maps for hot working are developed on the basis of the variations of efficiency of power dissipation

Microstructure and mechanical properties of as-cast Mg–Sn–Ca alloys and effect of alloying elements

(\eta= 2m/m + 1)

High Temperature Deformation Behaviour of a New Magnesium Alloy

where m is the strain-rate sensivity with temperature and strain rate, interpreted using a dynamic materials model. The maps of all these alloys exhibit a hightemperature domain representing the process of dynamic recrystallization (DRX), with a peak efficiency of power dissipation of about 38% occurring at

Processing map for cold and hot working of stainless steel type AISI 304 L

0.1s^{-1}

Kinetics of high-temperature deformation of polycrystalline OFHC copper and the role of dislocation core diffusion

. The DRX temperature for Nimonic 75, 80A and 90 are 1200°C, 1150°C and 1130°C respectively. The DRX features of these alloys are compared with those of Nichrome (Ni-20Cr) and Nimonic 105. Carbide dissolution is found to be essential for the occurrence of DRX in all of these alloys, which helps in making interstitial carbon available for increasing the rate of dislocation generation for DRX nucleation. The optimum conditions for good workability are more restricted with higher order of the Nimonic series of alloys. Flow instability due to adiabatic shear-band formation occurs in these alloys at strain rates above

Obstacles for low-temperature dislocation motion in polycrystalline zinc

1s^{-1}

Effect of Stacking-Fault Energy on Thermal Activation of Attractive Junctions in Change-in-Stress Creep of FCC Metals

.

Low-temperature deformation behaviour of polycrystalline copper

The characteristics of dynamic recrystallization (DRX) during hot working of copper containing various amounts of oxygen are studied in the temperature range 650–950 °C and strain-rate range