Microstructural aspects of superior creep resistance of a 10%Cr martensitic steel

The microstructural evolution and the dispersion of secondary phases were studied in a low-nitrogen 10%Cr martensitic steel with 3% Co and 0.008% B additives at 650 °C under an applied stress of 140 MPa. It was demonstrated that the superior creep strength of this steel can be attributed to the high resistance of M23C6-type carbides and Nb-rich MX carbonitrides against coarsening, resulting in a stable of the tempered martensite lath structure...