Zieliński Adam, Sroka Marek, Dudziak Tomasz
Institute for Ferrous Metallurgy, K. Miarki 12-14, 44-100 Gliwice, Poland.
Institute of Engineering Materials and Biomaterials, Silesian University of Technology, Konarskiego 18a, 44-100 Gliwice, Poland.
Materials (Basel). 2018 Oct 30;11(11):2130. doi: 10.3390/ma11112130.
Inconel 740H is a nickel-based alloy for pressure components of ultra-supercritical boilers. Its chemical composition and strengthened matrix, as well as corrosion resistance, provide the highest creep resistance among the materials recommended for use in high-performance pressure components of power units. This paper investigates the changes in the microstructure and mechanical properties after ageing at 700 and 750 °C for 1000, 10,000, 20,000, and 30,000 h. Observation of the microstructure was performed using scanning and transmission electron microscopy. The identification of existing precipitates was conducted by X-ray phase analysis. The effects of time and ageing at elevated temperatures on the mechanical properties and precipitation process in the test alloy are discussed. The presented results are part of the material characteristics of the new-generation alloys to be used in the design of pressure equipment for steam boilers, as well as in diagnostic work during operation.
Inconel 740H是一种用于超超临界锅炉受压部件的镍基合金。其化学成分、强化基体以及耐腐蚀性，使其在推荐用于动力装置高性能受压部件的材料中具有最高的抗蠕变性。本文研究了在700和750℃下时效1000、10000、20000和30000小时后微观结构和力学性能的变化。使用扫描电子显微镜和透射电子显微镜对微观结构进行观察。通过X射线相分析对现有析出相进行鉴定。讨论了时间和高温时效对试验合金力学性能和析出过程的影响。所呈现的结果是新一代合金材料特性的一部分，可用于蒸汽锅炉压力设备的设计以及运行期间的诊断工作。
