Authors: Sultan Alsagabi
Publish Date: 2015/12/29
Volume: 69, Issue: 8, Pages: 1513-1518
Abstract
The ferriticmartensitic steels are superior steels based on the potential properties that they possess especially the elevated temperature properties Among these ferriticmartensitic steels Cr–Mo–W steel is a candidate structural material for high temperature applications such as future advanced reactors and aerospace applications The hot deformation behavior of P92 steel was carried out at elevated temperatures between 600 and 700 °C and different strain rates of 10−5–10−3 s−1 Thereafter the hot deformation behavior was analyzed taking into account the peak stress values for each condition As a result the activation energy of P92 steel and the stress exponent were obtained to be 67 and 628 kJ/mol respectively The activation energy assessed the hightemperature deformation mechanism for this class of steels Even though the obtained activation energy was much higher than that of iron selfdiffusion it came in good agreement with the reported values in literature Subsequently the relevant hot deformation constitutive equation and the relationship between peak stresses and deformation rate at elevated temperature were developed
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