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51318-11112- Effect of Slow Strain Rate on Stress Corrosion Cracking of CrNiMoV weld joint in sodium chloride solution at 180 ℃

The stress corrosion cracking (SCC) susceptibility of 30Cr2Ni4MoV rotor steel welded joint in a 3.5 wt.% NaCl solution at 180 °C was investigated using slow strain rate tensile (SSRT) tests at different strain rates.

 

Product Number: 51318-11112-SG
Author: Yuhui Huang / Linghua Luo / Yuqing Ouyang / Fu-zhen Xuan
Publication Date: 2018
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 The stress corrosion cracking (SCC) susceptibility of 30Cr2Ni4MoV rotor steel welded joint in a 3.5 wt.% NaCl solution at 180 °C was investigated using slow strain rate tensile (SSRT) tests at different strain rates. The result revealed a significant reduction of ductility with slower strain rates, but little effect of strain rate on tensile strength was observed. The reduction in area decreased and the percentage of SCC area on the fracture surface increased with the strain rate decreasing, which indicated higher SCC susceptibility. Although the strain rates greatly influenced the SCC behavior in the welded joint, all the specimens fractured in nearly the same position of the weld metal (WM). This is likely to be ascribed to the lowest strength limit in WM among the welded joint and the SSRT tests with the strain rate of 10-7 s-1 are still dominated by mechanical factor.

Key words: Stress corrosion cracking, weld joint, slow strain rate, finite element analysis.

 The stress corrosion cracking (SCC) susceptibility of 30Cr2Ni4MoV rotor steel welded joint in a 3.5 wt.% NaCl solution at 180 °C was investigated using slow strain rate tensile (SSRT) tests at different strain rates. The result revealed a significant reduction of ductility with slower strain rates, but little effect of strain rate on tensile strength was observed. The reduction in area decreased and the percentage of SCC area on the fracture surface increased with the strain rate decreasing, which indicated higher SCC susceptibility. Although the strain rates greatly influenced the SCC behavior in the welded joint, all the specimens fractured in nearly the same position of the weld metal (WM). This is likely to be ascribed to the lowest strength limit in WM among the welded joint and the SSRT tests with the strain rate of 10-7 s-1 are still dominated by mechanical factor.

Key words: Stress corrosion cracking, weld joint, slow strain rate, finite element analysis.

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