Research on Influence of Grain Boundaries on the Mechanical Properties of 460MPa Refractory Steel used for High-Strength Building Structures

Abstract In this paper, the microstructure of Mo-type seismic refractory steel for building g, as well different boundary densities and ratios, are combined with elevated-temperature mechanical properties analysis to explore laws high-temperature performance. The results show that salt water cooling (SWC) (WC) can obtain lath bainite a higher content, oil (OC) lower rate multiphase + bulk ferrite. characterization when sample contains more high angle grain boundaries (Block High-Packet boundaries), dislocation density is high, it make have better at room temperature. When content low interfacial energy twin (Σ3 boundary, which mainly composed V1/V2 variant pair) will stability after temperature tempering, decrease slightly, ensuring has