Stress corrosion crack propagation affected by microstructures for nuclear steam turbine rotor steels in the simulated environment

Journal of Materials Research and Technology

Yuhui Huang¹  Shuxian Lin²  Shuo Weng³  Fu-Zhen Xuan⁴ 

[1] Machinery Industry Key Laboratory for Mechanical Strength and Reliability Evaluation of Auto Chassis Components, University of Shanghai for Science and Technology, Shanghai, 200093, China;Shanghai Technology Service Platform of Reliability Evaluation for New Energy Vehicle, China;School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China;School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China;

关键词: CrNiMoV steel;    Stress corrosion crack;    Propagation path;    Crack growth rate;   

DOI  :  

来源: DOAJ

【 摘 要 】

The propagation behavior of stress corrosion cracking (SCC) for two CrNiMoV steels in the simulated environment of low-pressure nuclear steam turbine rotor was systematically investigated by microstructural characterizations, electrochemical measurements, slow strain rate tensile tests, and crack growth rate (CGR) measurements. The results showed that both the corrosion susceptibility and stress corrosion susceptibility increased with the increase of localized residual strain, yield strength, and the decrease of grain size. With the higher stress corrosion susceptibility, the SCC CGR of Steel A was higher than Steel B in the corrosive solution at 80 °C, however, at 180 °C the SCC CGR of Steel A was lower than Steel B under the lower applied K. The change of SCC CGR was strongly affected by crack branches, crack deflections and plastic deformation during the SCC propagation, which may have some correlations with the microstructural distribution.

【 授权许可】

Unknown