Investigation of stress corrosion cracking of the cast and forged steel in water |
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Authors: | Wu-Yang Chu Chi-Mei Hsiao Wen-Xue Li Yan-Guo Zhang |
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Affiliation: | (1) Department of Metal Physics, Beijing University of Iron and Steel Technology, China;(2) Chang-Zhi Steel Company and Central Iron and Steel Research Institute, China |
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Abstract: | The aqueous stress corrosion behavior of cast steel and forged steel of the same heat has been examined. It was shown that
the activation energy of crack growth of both cast and forged steels was identical,i.e., Q = 5540 cal/mol, and was comparable with the apparent diffusion activation energy of hydrogen in the steel. Theda/dt for cast and forged steel increased under both cathodic and anodic polarization conditions. Correspondingly, the steady-state
hydrogen permeation flux increased steeply with the increase of polarizing current under either cathodic or anodic polarization.
The influences of the polarization upon theda/dt and the hydrogen permeation flux were similar. TheK
ISCC
of the cast steel was larger than that of the forged steel. This may be due to the observation that the steady-state permeation
flux for the forged steel was twice as large as that of the cast steel. For both cast and forged steels the fracture modes
were clearly dependent uponK
I
at the crack tip, and a transition from dimple to quasi-cleavage or intergranular was observed on the fracture surfaces with
decreasingK
I
.
Formerly Students at Beijing University of Iron and Steel Technology |
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Keywords: | |
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