P92钢625℃持久性能分段特征与各段中M₂₃C₆及Laves相相参数的定量变化研究

来源期刊：金属学报2010年第4期

论文作者：彭志方 蔡黎胜 彭芳芳 胡永平 陈方玉

文章页码：429 - 434

关键词：P92钢； 持久性能分段； M₂₃C₆相； Laves相

Key words：P92 steel； multi-region analysis for creep-rupture property； M₂₃C₆ phase； Laves phase

摘    要：研究了P92钢在625℃下加载应力与断裂时间关系曲线的分段特征以及各试样中M₂₃C₆及Laves相参数的定量变化.结果表明,根据该钢在625℃,110-180 MPa条件下的持久实验得到的应力-断裂时间关系曲线的变化趋势,可将该曲线分为高应力-短时段(180-150 MPa,30-454 h)和低应力-长时段(140-110MPa,2881-10122 h)两个特征段;在高应力-短时段,M₂₃C₆相颗粒聚集与粗化占主导;在低应力-长时段,Laves相及M₂₃C₆相颗粒并行聚集与粗化;相成分、相含量及相间元素分配量(相参数)随时间及应力而变化.

Abstract: In the present study,the multi-segment feature of stress vs rupture-time plot and the corresponding quatitative change of phase parameters of M₂₃C₆ and Laves in each segment were investigated for P92 steel samples subjected to 625℃ creep-rupture tests.The results indicate that the stress vs rupture-time plot obtained from the test results can be divided into two segments (higher stress level and shorter rupture time segment:180-150 MPa/30-454 h,and lower stress level and longer rupture time segment:140-110 MPa/2881-10122 h) respectively,and the microstructural evolution is closely related to the feature of each segment.In the higher stress level and shorter rupture time segment the M₂₃C₆ particles are coarsened,while in the lower stress level and longer rupture time segment both M₂₃C₆ and Laves phases are coarsened,but the latter is predominantly.The average composition, the amount and the elemental partitioning of each alloy phase called phase parameters can be determined by a multiphase separation method developed.