Relative effect of B and N concentrations on the microstructural stability and mechanical properties of modified 9Cr-1Mo steel

The present study systematically varied the concentrations of B (0–100 ppm) and N (20–500 ppm) in modified 9Cr-1Mo steel to understand the combined effect of B and N addition on the microstructural stability and the creep resistance (650 °C, 120 MPa). The Auger Electron Spectroscopic analysis reveals the enrichment of B within the M23C6 precipitates at the vicinity of prior-austenite grain boundaries in B added steels both in normalized and...