Fedorova, I, Liu, F, Grumsen, F B, Cao, Y, Mishin, O V & Hald, J 2018, ' Fine (Cr,Fe) 2 B borides on grain boundaries in a 10Cr–0.01B martensitic steel ', Scripta Materialia, vol. 156, pp. 124-128 . https://doi.org/10.1016/j.scriptamat.2018.07.021
A 10Cr creep resistant martensitic steel with 108 ppm B was normalized at 1100 °C for 1 h and air cooled. Fine (Cr,Fe)2B borides were observed on the majority of prior austenite grain boundaries, all of which were high angle boundaries, as revealed by EBSD-based reconstruction of parent austenite grains. Some high angle boundaries including twin boundaries were boride-free. Segregation of boron to austenite grain boundaries during slow cooling from 1100 °C led to boride nucleation and growth. Their size increased with decreasing cooling rate. Borides were verified by atom probe tomography, auger spectroscopy, transmission and scanning electron microscopy.
