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Metal Flow Behaviour and Processing Maps of High Heat Resistant Steel During Hot Compression by Japheth Obiko; Lesley Chown; David Whitefield; Micheal Bodunrin is a Engineering article available to read on EtoBox.

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This article reports the flow stress behaviour of ASTM A335 P92 steel. Uniaxial isothermal compression experiments were conducted to examine the hot deformation behaviour of P92 steel in a Gleeble ® 3500 thermal-mechanical simulator. The test conditions were 0.01-10 s -1 strain rate and 850-1000 °C deformation temperature. Constitutive equations and processing maps developed were used to describe the hot deformation process. The results showed that the flow stress-strain curves exhibited a dynamic recovery (DRV) behaviour as the dominant softening mechanism. The flow stress decreased with an increase in the deformation temperature or a decrease in strain rate. Using the Arrhenius equation, the stress exponent and the activation energy values were 8.0 kJ.mol -1 and 487.56 kJ.mol -1 , respectively. The correlation between the constructed processing maps and microstructure showed that the optimal process parameters occurred at a lower strain rate in the region of 0.1 s -1 and deformation temperatures of 900-950 °C and 1000 °C for the steel investigated.

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Author

Japheth Obiko; Lesley Chown; David Whitefield; Micheal Bodunrin

Publisher

Springer Science and Business Media LLC

Published

2022

Language

EN

Field

Engineering (Physical Sciences)