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In-situ TEM Observation of Dislocation Emission, Multiplication and Motion Induced by Anodic Dissolution in Type 310 Stainless Steel

Yizhong HUANG , Qizhi CHEN and Wuyang CHU (Dept. of Materials Physics , Univrsity of Science and Technology Beijing , Beijing 100083 , China)(To whom correspondence should be addressed)

材料科学技术（英文）

A special constant deflection device for TEM has been designed and then the dislocation configuration change ahead of a loaded crack tip after corrosion or anodic dissolution for some time but before the initiation of SCC can be observed in TEM. The results showed that anodic dissolution during SCC of a type 310 stainless steel in deionized water could promote dislocation emission,multiplication and motion before the initiation of SCC.

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Dissolution-facilitating Dislocation Emission, Motion and Initiation of SCC in 310 Stainless Steel

Yizhong HUANG , Qizhi CHEN and Wuyang CHU(Dept. of Materials Physics , University of Science & Technology Beijing , Beijing 100083 , China)

材料科学技术（英文）

Using a special constant deflection device, the in situ TEM observations of dislocation emission,motion and the initiation of nanocrack in 310 stainless steel in water were carried out. The results show that SCC in thin foil specimen of 310 stainless steel can occur in water. A nanocrack initiated in the DFZ or at the blunt crack tip in corrosion solution after dislocation emission,multiplication and motion, which were induced by the localized anodic dissolution, reached a critical condition. The nanocrack propagated by a cleavage mode because of the influence of the corrosion solution.

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