Effect of Molybdenum Contents on Hardenability and Precipitation Behaviors in B-added Steels Austenitized at High Temperature

The effect of molybdenum (Mo) contents on hardenability and precipitation behaviors in Mo-B simultaneously added steels were investigated placing a focus high austenitizing temperature. 0.5% Mo - 11 ppm B steel austenitized at 1150°C was decreased compared with that 950 °C, whereas 1.0% 10 1.5% 9 less affected by temperature than steel. Fe23(C, B)6 increasing also revealed to be suppressed – These results indicate the improved addition retarding still appear B-added Furthermore, start increased 1150 °C. This result implies non-equilibrium segregation mechanism during cooling from enhances amount segregated grain boundaries leading promotion borides region. However, is presumed fix part thermal vacancies as Mo-V complex resulting suppression cooling, which speculated inhibit precipitation. Thus, combined presumably maintained even