摘要
利用Thermo-Calc软件和相关数据库对Fe-18Cr-18Mn-C-Mo(Si)-N合金系在氮气压力为100kPa下随N含量变化的变温截面进行了计算.结果发现,随着C的质量分数从0增加到0.12%时,γ相区没有发生明显的变化,但对碳化物M23C6的析出产生了显著的影响,从而改变了高氮钢奥氏体化后的析出序列.当继续添加质量分数为2%的Mo时,γ/α+γ相边界向右侧移动,不但存在碳化物M23C6还有碳化物M6C.当添加不同含量的Si时,γ相区明显缩小,而且碳化物M23C6的析出温度与成分也发生了很大的变化.Fe-18Cr-18Mn-0.09C-0.8Si-0.5N钢的奥氏体化温度及Cr2N相析出温度与该合金系的热力学计算结果符合,表明这些计算结果可为Fe-18Cr-18Mn-C-Mo(Si)-N合金系的成分设计及热处理工艺提供依据.
The vertical sections varying with the nitrogen content under standard atmosphere in the Fe-18Cr- 18Mn-C-Mo（Si） -N system have been calculated by the Thermo-Calc software and Fe-based database. It has been shown that with the increasing of C content from 0 to 0. 12% （mass fraction）, the γ phase field has not changed obviously; but the precipitation of the M23 C6 phase has been affected, and the precipitation consequence in the high nitrogen steel austenitized has been changed. After 2% Mo （ mass fraction） was added further, γ/α ＋ γ phase boundary moved to the right; not only M23 C6 phase but M6C phase existed. With the different Si content, γ phase field has shrunk obviously, and the precipitation temperature and the composition of the M23 C6 carbide changed greatly. The experimental data about the austenitizing temperature and the precipitation temperature of Cr2N phase in the Fe-18Cr-18Mn-0. 09C-0.8Si-0. 5N steel are consistent with the thermodynamic calculation results. So it has been proven that the thermodynamic calculation could provide the basis for the design of the alloy and heat treatment in Fe-18Cr-18Mn-C-Mo（ Si）-N system.
出处
《材料与冶金学报》
CAS
2007年第1期45-49,共5页
Journal of Materials and Metallurgy
基金
国家自然科学基金(No.50534010)
国家基础研究计划(No.2004CB619103)
