Effect of chromium concentration on microstructure and properties of Fe-3.5B alloy

▶ With the increasing chromium additions, the boride changes from Fe2B to (Fe,Cr)2B-type boride. ▶ The matrix of Fe-3.5B alloy transforms to supersaturated α-(Fe,Cr) solid solution when high chromium concentration is added. ▶ The fracture toughness of boride increases with the increase of chromium addition. ▶ Secondary phase precipitates during the heat treatment of Fe-3.5B alloy with various chromium concentrations.