The effect of MnS and its size on the heterogeneous nucleation and precipitation of Bismuth was investigated. The results show that bismuth segregates at grain boundaries and suppresses the growth of grains in steel without MnS inclusion. While in steel containing MnS inclusion, bismuth segregates at the MnS/substrate interfaces and MnS can act as an effective nucleus for the heterogeneous nucleation of bismuth. The segregation degree of bismuth is reduced in steel with MnS inclusion, which may be because of the fact that MnS particles provide more interfaces for bismuth to distribute. Moreover, according to the experimental results, the optimum size of MnS for the heterogeneous nucleation of bismuth is 1–2.72 μm in diameter.

研究了MnS及其尺寸对铋异质形核和析出的影响。结果表明，铋在晶界处偏析并抑制了不含MnS的钢中晶粒的生长。在含MnS夹杂物的钢中，铋偏析在MnS /基体界面上，而MnS可以充当铋异质成核的有效核。含有MnS的钢中铋的偏析度降低，这可能是因为MnS颗粒为铋提供了更多的界面。此外，根据实验结果，用于异质铋形核的MnS最佳尺寸为1-2.72μm。