Effects of Nitrogen in 9Cr-3W-3Co Ferritic Heat Resistant Steels Containing Boron.

Many researchers revealed that the addition of small amount of boron (B) significantly improves the creep strength of ferritic heat resistant steels. However the mechanism for such an effect caused by B has not been clarified yet. In the present study, the effect of nitrogen (N) on the behavior of B in 9Cr-3W-3Co base steels was examined using Alpha-particle Track Etching (ATE), Scanning Electron Microscopy (SEM), Transmission Electron...