Study on the characteristics and high-temperature dissolution mechanism of eutectic carbides in medium-alloy steel

• DOI: 10.1016/j.jmrt.2024.06.083
• Publication Date: 2024-06-13T00:10:41Z
• Authors: Yu Ji; Chao Yang; Tingting Xu; Leqian Xu; Yang Li; Chundong Hu; Han Dong
• Keywords: Supercooling; Dendrite (mathematics)

In this study, the high-temperature evolution of eutectic carbides in a medium-alloy steel was investigated as well their precipitation mechanism. Results revealed that MC and M6C appeared during final solidification due to segregation Mo V melt undercooling. These consist blocky shapes with varying orientations, rod-like same orientation. Further investigation confirmed (MC M6C) exhibited an intergrowth behavior. The cooling rate had direct influence on secondary dendrite arm spacing (SDAS), which decreased from 180 130 μm ranged 0.6 21.9 °C/min. After holding for 0, 25, 50, 80 h, respectively, volume percentage significant decreasing trend 2 0.2%. Additionaly, irregular morphology after 0–50 transformed into shape small size distributed along grain boundaries h. This phenomenon attributed mutual diffusion between Mo, V, other alloying elements Fe element matrix.