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1.前言 在蒸气条件为650℃、350大气压的超超临界压力发电设备中,能达到兼顾提高高温蠕变强度和抗水蒸气氧化性是目前主要的研究课题。目前,在改善抗水蒸气氧化性方面,添加Si表明是有效果的。但是也有报导,添加过量的Si,促使了碳化物的内聚粗大化和金属间化合物的拆出,使蠕变强度等力学性能变差。因此,在兼顾蠕变强度与抗水蒸气氧化性方面,改善在高Si组成方面的组织稳定性,或低Si组成方面的抗氧化性的改善成为研究重点。
1. Introduction In the ultra-supercritical pressure power generation equipment with steam conditions of 650 ° C and 350 atm, it is currently the main research topic that both high temperature creep strength and water vapor oxidation resistance can be achieved. At present, addition of Si is effective in improving the resistance to water vapor oxidation. However, it has also been reported that the addition of excess Si promotes the cohesion and coarsening of carbides and the removal of intermetallic compounds, which deteriorates the mechanical properties such as creep strength. Therefore, improvement of the structural stability in the high-Si composition or the improvement of the oxidation resistance in the low-Si composition has been the focus of attention in both the creep strength and the resistance to water vapor oxidation.