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系统总结了运行 0万 h、1 0 .4万 h、1 4.7万 h、1 5 .3万 h的主蒸汽“薄壁管”的金相组织、力学性能及碳化物中合金元素析出量变化规律 ;对运行达 1 5 .3万 h的老化材料采用 X光衍射、电镜及扫描电镜损伤分析等手段揭示了其老化机理 ;结合运行1 5 .3万 h管焊口持久强度试验结果给出材质寿命评定结果
The microstructure of main steam “thin-walled tube” operating at 0h, 104k, 14000h, 15h and 30h is systematically summarized. The mechanical properties and the precipitation of alloying elements in carbide The aging mechanism of 15 5 000 h aging materials was revealed by means of X-ray diffraction, electron microscope and scanning electron microscope (SEM), and the result of long-term strength test Material life assessment results