Mechanical and Physical Characters of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames
Chemical composition, metallurgical photos, macro- and micro-hardness values, macrostructures, inclusions, denseness, mechanical properties are experimentally investigated on the grade B cast steel for the bogie frames of Chinese railway rolling wagons. Results reveal that the material consists of ferrites and pearlites. Micro-hardness values of the ferrites are significant lower those of pearlites to indicate the ferrites is the weakest phase of material. Casting flaws are mainly point-network like eutectic sulfur compounds and polygonal sphere like Al2S3 compounds. Lower Young's modulus, higher proportion of yielding to ultimate strengths, higher reduction of area, and a lower elongation than those of conventional ferrous alloys are exhibited. These characters are contributed to the non-sharp cast flaws. The flaws play roles of two effects. One is to benefit anti-vibration capacity and fracture roughness. And another is to decrease the mechanical strengths.
L.Y. Xie, M.N. James, Y.X. Zhao and W.X. Qian
Y. X. Zhao and B. Yang, "Mechanical and Physical Characters of the Cast Steel for Chinese Railway Rolling Wagon Bogie Frames", Advanced Materials Research, Vols. 118-120, pp. 90-94, 2010