Toughness evolution of 9Cr–3W–3Co martensitic heat resistant steel during long time aging

Toughness of G115 martensitic heat resistant steel after heat treatment and aging for different time at 650 °C was tested at room temperature. The corresponding microstructure was also experimentally obtained by field emission scanning electron microscope (FESEM), field emission transmission electron microscope (FETEM), X-Ray diffraction (XRD), electron back-scattered diffraction (EBSD) characterization and phase analysis. The results show that...