Characterization of Long-term Service Coal Combustion Power Plant Extreme Environment Materials

The technical goal of this project is to develop a comprehensive database of mechanical properties, alloy microstructures, and to a lesser extent, the oxidation/corrosion behavior of coal-fired power plant components, such as boiler tubing, steam headers and steam piping, which have been in long-term service (at least 100,000 operating hours, and preferably more than 200,000 operating hours) under the operating conditions of high temperatures and high mechanical stresses where creep, fatigue, steam-side oxidation, and fireside corrosion are life-limiting factors. The components included in the database will include the following types of high temperature alloys: creep strength enhanced ferritic (CSEF) steels, 300-series H-grade stainless steels, and dissimilar metal welds (DMWs).

本项目的技术目标为构建一套涵盖燃煤发电站组件力学性能、合金微观组织，以及相对次要的氧化/腐蚀行为的综合数据库。所涉组件包括锅炉管材、蒸汽集箱与蒸汽管道，此类组件均在高温、高机械应力的服役环境中长期运行（至少10万运行小时，理想工况下应超过20万运行小时），而蠕变、疲劳、蒸汽侧氧化与炉侧腐蚀是制约其服役寿命的关键因素。本数据库收录的组件将涵盖以下几类高温合金：蠕变强化铁素体（creep strength enhanced ferritic, CSEF）钢、300系列H级不锈钢，以及异种金属焊缝（dissimilar metal welds, DMWs）。