中国电机工程学报2011，Vol.31Issue(8)：108-113,6.
先进超超临界机组用Inconel740合金的组织稳定性研究
Study on Microstructure Stability of Inconel 740 for Advanced Ultra Supercritical Unit
摘要
Abstract
Microstructures of Inconel 740, a new type nickel-based superalloy for advanced ultra supercritical steam boiler tubing, at different heat treatment conditions including solution treatment, precipitation treatment and ageing at 750 ℃ for 300, 1 000 and 3 000 h were investigated by using SEM (scanning electron microscope), FEG-SEM(field emission gun scanning electron microscope), TEM(transmission electron microscope) and EDS(X-ray energy dispersion spectroscopy). The results indicate that the grain size is about ASTM No.3 to 4, many large primary (Nb,Ti)C and TiN precipitate in the matrix randomly and gamma prime phase nucleate after solution treatment. After precipitation treatment, a lot of M23Q carbide and a little of G phase precipitate at grain boundaries, gamma prime phases precipitate coherently in the grains. Gamma prime phases grow with Ostwald ripening rule during ageing at 750 °C, G phase become dominant on grain boundary after long term exposure, eta phase begin to precipitate along gamma grain boundary at 300 h, grow with ageing time and tend to show Widmanstatten pattern after 3 000 h. Microstructure stability of Inconel 740 requires further improvement.关键词
先进超超临界/高温合金/Inconel 740/时效/组织分类
能源科技引用本文复制引用
张红军,周荣灿,侯淑芳,郭岩..先进超超临界机组用Inconel740合金的组织稳定性研究[J].中国电机工程学报,2011,31(8):108-113,6.基金项目
中国华能集团公司科技项目(HNKJ08-H16). （HNKJ08-H16）
