Influence of thermal-deformation history on evolution of secondary phases in P91 steel
Influence of thermal-deformation history on evolution of secondary phases in P91 steel
复制标题
热变形历史对 P91 钢第二相演化的影响
DOI：
10.1016/s0921-5093(02)00768-2
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发表时间：
2003
期刊：
影响因子：
6.4
通讯作者：
A. Výrostková
中科院分区：
文献类型：
--
作者：
V. Homolová;J. Janovec;P. Záhumenský;A. Výrostková
采用透射电镜研究了853、893和923 K退火后P91钢的热变形历史对二次相演变的影响。计算了与所研究钢相对应的Fe-Cr-V-Mo-Ni-Nb-Mn-N-C体系的相平衡。计算使用热力学数据库程序thermal - calc进行。m23c6和MX相在所有条件下均得到了实验鉴定。Laves相只存在于853和893 K退火时间较长的条件下，以及923 K / 1000 h退火的非变形条件下。热力学计算表明m23c6和MX在853、893和923 K时为平衡相。Laves相的实验结果与计算结果的差异表明，所研究的钢在853和893 K时效5000 h后没有达到平衡，或者应该修改该相的热力学模型。m23c6碳化物的Cr/Fe比在初始变形和未变形条件下的温度依赖性也表现出相反的趋势。
The influence of thermal-deformation history on the evolution of secondary phases in P91 steel annealed at 853, 893, and 923 K was studied by means of transmission electron microscopy. Calculations of phase equilibria for a Fe–Cr–V–Mo–Ni–Nb–Mn–N–C system corresponding to the investigated steel were also carried out. The calculations were performed using the thermodynamic database program Thermo-Calc. M23C6and MX phases were identified experimentally in all conditions investigated. Laves phase was only found in conditions annealed for longer times at 853 and 893 K and in the non-deformed condition annealed at 923 K per 1000 h. The thermodynamic calculations revealed M23C6and MX as equilibrium phases at 853, 893, and 923 K. The discrepancy between experimental and calculated results concerning the Laves phase indicates that either the investigated steel has not achieved equilibrium after aging for 5000 h at 853 and 893 K or the thermodynamic model for this phase should be modified. Also the temperature dependencies of the Cr/Fe ratio for M23C6carbide showed opposite tendencies for originally deformed and non-deformed conditions.