根据错配位错理论 ,提出了对钢中MnS与奥氏体之间半共格界面比理论计算方法 ,包括比界面能σ1,侧面上的比界面能σ2 ,MnS沉淀初期侧面上的比界面能σ′2 和平均比界面能的计算。当MnS尺寸很小时(≤ 10 0nm)MnS长短轴比为 5 3,当继续长大时 ,长短轴比值降低至 1 5左右 According to the theory of misfit dislocation, a semi-coherent interfacial ratio calculation method between MnS and austenite in steel is proposed, including specific interface energy σ1, specific interface energy σ2 on the side surface, specific interface on the initial side of MnS precipitation Calculation of the interfacial energy σ2 and the average ratio. When the size of MnS is very small (≤10 0nm), the ratio of MnS length to short axis is 53. When the length of MnS is continued to grow, the ratio of length to short axis is reduced to about 15