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STUDY OF CREEP BEHABIOR OF P92 STEEL |
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Abstract Based on the creep data, the creep rupture strength extrapolation curve of P92 steel was calculated, the extrapolated strength from which were similar to the data of ECCC. The creep characteristic of the new generation heat resistant steel P92 was studied as well, the values of Norton stress exponents of high stresses creep indicated that the creep mechanism was dislocation mechanism. The results of microstructure investigation showed that the strengthening mechanism of P92 steel was dislocation and dispersion strengthening. There were high density dislocations inside the martensite lath and carbide M23C6 between the martensite lath and disperse carbonitride MX , these were the reason why P92 steel had a high strength. The heat resistance of P92 steel decreased with the decreasing dislocation density and precipitated phases coarsening.
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Received: 20 November 2009
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