Metal flow behaviour and processing maps of high heat resistant steel during hot compression

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Abstract 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 and 487.56 kJmol− 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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