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对600℃超超临界电站锅炉过热器/再热器用Super304H耐热不锈钢的长期组织稳定性进行了研究.将Super304H管材经650℃、104h长期时效后,用扫描电镜、透射电镜和原子层析技术综合分析了Super304H中析出相的行为,包括相析出初期的原子聚集,析出相的本质、成分、形态以及尺寸大小和分布.结果表明,Super304H中主要析出相为富Cu相、MX和M23C6.随时效时间的延长,M23C6颗粒很快粗化,特别是在晶界处逐渐由颗粒状长大成连续状,而减弱了应有的强化效应;晶内弥散析出,尺寸为150nm左右的MX相数量明显增多,特别是尺寸细小(3～35nm)的富铜相,均匀弥散分布.说明Su-per304H中起主要强化作用的是富铜相,其次是MX相和一部分M23C6碳化物.
The long-term stability of Super304H heat-resistant stainless steel for superheater / reheater of supercritical power plant at 600 ℃ was investigated.The long-term aging stability of Super304H steel was studied by scanning electron microscopy, transmission electron microscopy and atomic layer analysis The results show that the main precipitates in Super304H are Cu-rich phase, MX and M23C6. All the samples are stable and stable in super304H. M23C6 particles coarsen quickly, especially in the grain boundaries gradually grow from granular to continuous shape, and weakened due to the strengthening effect; intracrystalline dispersion, the size of about 150nm MX phase significantly (3 ~ 35nm) Cu-rich phase, indicating that Su-per304H plays a major role in the strengthening of the copper-rich phase, followed by the MX phase and part of the M23C6 carbide.