Fe-9.7Cr-2.65Mn-xC-0.22V-2W-0.1Ta-1.5Si-yN马氏体耐热钢相图计算  

Thermodynamic Calculation of the Vertical Sections in the Fe-9. 7Cr-2. 65Mn-xC-0. 22V-2W-0. 1Ta-1. 5Si-yN Martensitic Heat Resistant Steels

作　　者：孙佳[1] 张玉妥[1] 王培[2] 

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]中国科学院金属研究所,沈阳材料科学国家(联合)实验室,辽宁沈阳110016

出　　处：《沈阳理工大学学报》2014年第5期53-57,共5页Journal of Shenyang Ligong University

摘　　要：利用Thermo-Calc软件和相关数据库对Fe-9.7Cr-2.65Mn-xC-0.22V-2W-0.1Ta-1.5Si-yN马氏体耐热钢随N含量变化的相分数进行计算。结果发现,当保持x+y=0.24wt.%时,随着N的质量分数从0.015增加到0.10wt.%时,相图没有发生实质性的变化;但对室温组织和碳化物Cr23C6、TaC和VN的析出产生了显著的影响,从而改变了Fe-9.7Cr-2.65Mn-xC-0.22V-2W-0.1Ta-1.5Si-yN马氏体耐热钢奥氏体化后的析出序列。当N含量升高到0.085wt.%时,出现了新相Cr2N。XRD及萃取实验结果与计算相符。这些计算结果可为Fe-9.7Cr-2.65Mn-xC-0.22V-2W-0.1Ta-1.5Si-yN马氏体耐热钢的成分设计、热处理工艺设计和显微组织观察等提供依据。The phase fraction diagrams varying with the nitrogen content in the Fe-9. 7Cr- 2. 65Mn-xC-0. 22V-2W-0. 1Ta-1.5Si-yN martensitic heat resistant steels have been calculat- ed by the Thermo-Calc software and Fe-based database. It has been shown that when the x ＋y =0. 24wt. % with the increasing of N content from 0. 015 to 0.10% （mass fraction）, the phase region has not changed substantially, but the room temperature organization and the precipitation of the Cr23 C6, TaC and VN phase has been affected, and the precipitation consequence in the Fe-9. 7Cr-2.65Mn-xC-0. 22V-2W-0. 1Ta-1.5Si-yN martensitic heat re- sistant steels has changed. As the N content reached 0. 085wt. % ,a new phase Cr2N precipi-tates. The XRD experiments results are all well consistent with the calculation results. The thermodynamic calculation could provide the basis for the design of the alloy, heat treat- ment and the microstructure observation of the Fe-9. 7Cr-2.65Mn-xC-0. 22V-2W-0. 1Ta- 1.5 Si-yN martensitic heat resistant steels.

关 键 词：马氏体耐热钢 相图计算 析出相 

分 类 号：TG142[一般工业技术—材料科学与工程]