Investigation on microstructure of weld metal of HR3C heat resistantsteel afterservice for 50000 hours

2019 3rd International Workshop on Renewable Energy and Development

能源学;生态环境科学

Xinmei, Li^1 ; Zhongwen, Zhang^1 ; Xiulian, Li^2 ; Baoshuai, Du^1 ; Wen, Li^3 ; Shuai, Suo^3 ; Yuzhong, Wei^4

Shandong Electric Power Research Institute, Shandong Electric Power Corporation, Jinan, Shandong

250002, China^1

Shandong Labor Vocational and Technical College, Jinan

250022, China^2

Shandong Power Industry Boiler and Pressure Vessel Inspection Center Co. Lid., Shandong Jinan

25002, China^3

Huadian Zouxian Electric Power Co. Lid., Shandong Jining

273522, China^4

关键词: Cellular dendrites;    Crystal boundary;    Dendritic crystal;    High intensity;    Highly stables;    Hours of services;    M23C6 carbides;    Small particles;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/267/3/032044/pdf
DOI  :  10.1088/1755-1315/267/3/032044

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This paper studied the microstructure of the HR3C steel-welded metal having serviced for 500 hours via metalloscopy, scanning electron microscopy and Energy Disperse Spectroscopy (EDS). As the result shows, the HR3C steel-welded metal remains the cellular-dendrite structure after 500 hours of service, with the number of its precipitated phases increased and its size enlarged. The M23C6 carbide is distributed in the strip or lump pattern along the boundaries of afterbirth-like crystals and dendritic crystals, while it is distributed in the form of small particles close to the crystal boundaries. Cu-rich phase, NbCrN- and Nb (C, N) - precipitated phases are highly stable and small, which accounts for the main reason why the HR3C steel welding joint presents high intensity.