Research of intergranular corrosion properties of heat affected zone for HR3C steel after aging treatment

2019 2nd International Conference on Advanced Materials, Intelligent Manufacturing and Automation

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

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

250002, China^1

Institute of Materials Science and Engineering, Ocean University of China, Shandong, Qingdao

266100, China^2

Shandong Labor Vocational and Technical College, Jinan

250022, China^3

Huadian Zouxian Electric Power Co. Lid., Shandong, Jining

273522, China^4

关键词: Aging time;    Aging treatment;    Double-loop;    Intergranular corrosion susceptibilities;    Potentiokinetic;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/569/2/022023/pdf
DOI  :  10.1088/1757-899X/569/2/022023

来源: IOP

【 摘 要 】

The intergranular corrosion susceptibility of heat affeceed zone(HAZ) for HR3C steel after aging at 600°C was investigated using electrochemical double-loop potentiokinetic reactivation. Experimental results show that HAZ has intergranular corrosion susceptibility after aging at 600°C. At the initial stage precipition of M23C6 along grain boundaries occurs rapidly, which leads to formation of Cr-depleted in the grain boundary and the increase of intergranular corrosion susceptibility. With the increase of aging time, the Ra value of HAZ rapidly increase. Intergranular corrosion of HAZ after aging occur due to the precipitation of M23C6 along grain boundaries, not only the precipitation of M23C6 along grain boundaries caused poor Cr, but the precipitation of M23C6 inside the grains also results in the formation of Cr-depleted zone and subsequent corrosion.