Research progress on high temperature materials for 700°C ultra-supercritical coal-fired units

2018 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

材料科学;无线电电子学;计算机科学

Gong, Weiwei^1 ; Zhang, Tao^1 ; Zheng, Jianjun^1 ; Chen, Hao^1

Inner Mongolia Electric Power Research Institute, Hohhot

010000, China^1

关键词: Firepower generators;    High temperature materials;    Inconel 617 alloy;    Main steam pipes;    Material research;    Microstructures and mechanical properties;    Supercritical coal-fired units;    Water cooled wall;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/439/5/052014/pdf
DOI  :  10.1088/1757-899X/439/5/052014

来源: IOP

【 摘 要 】

Nowadays, material research worldwide for 700°C ultra-supercritical firepower generator units (USC-FPGUs) is focus on the evolution of microstructures and mechanical properties as well as the research progress of high-temperature materials, which are used for fabricating water-cooled wall, superheater/reheater tube, main steam pipe and high-temperature steam header. HCM12 steel and Inconel 617 alloy are suited for high-temperature segment of water-cooled wall. Inconel 740H alloy developed from Inconel 740 alloy after modification is the preferred material for superheater/reheater, main steam pipe and high-temperature steam header due to its excellent persistent creep strength and welding performance. In future research, it is necessary to further verify the high-temperature persistent strength and creep strength of the aforementioned materials through practice. Meanwhile, the optimum hot working process should be exploited to improve the hot-workability and welding performance as well as reduce the cost of materials.