Abstract: Simulated calculation and analysis on equilibrium precipitated phases MBC6 and ferrite as well as non-equilibrium solidification of martensitic stainless steel 9Cr18Mo ( % ： 0. 95 〜1. 10C, 16. 6 ~ 18. 0Cr, 0. 4 - 0. 7Mo) have been carried out by using Thermo-Calc thermodynamic calculation software. Results show that during solidification the segregation of C, Cr, Mo and Fe in steel 9Cr18Mo is rather serious, the C and Cr content in steel have definite effect on the precipitated amount of M₂₃C₆ and the elements such as Cr and Fe content in M₂₃C₆ and in matrix, while the change of Mo content in steel only effects on the precipitated amount of M₂₃C₆ and the Cr and Mo content in M₂₃C₆.

Key words: Martensitic Stainless Steel 9Crl8Mo, Precipitated Phases, Thermodynamic Calculation

摘要： 采用Thermo-Calc热力学计算软件,对9Cr18Mo马氏体不锈钢(%:0.95～1.10C、16.0～18.0Cr、0.4～0.7Mo)平衡析出相M₂₃C₆和铁素体以及非平衡凝固进行了模拟计算分析。结果表明,凝固时9Cr18Mo钢中C、Cr、Mo和Fe偏析都比较严重;C和Cr含量对M23C6析出量以及M₂₃C₆与基体中的Cr、Fe含量有一定的影响;而Mo含量的变化仅对M₂₃C₆析出量以及M₂₃C₆所含Cr、Mo元素有所影响。

关键词: 9C18Mo, 马氏体不锈钢, 析出相, 热力学计算