Mechanism of stress corrosion cracking initiation and coalescence of Ni alloy 600.

What is it about?

This work is concerned with the mechanism of intergranular stress corrosion cracking (IGSCC) initiation and coalescence of thermally sensitized Ni alloy using in situ optical microscopy and electron backscatter diffraction (EBSD). The cracking behavior of the grain boundary monitored from the in situ observation along the cracking path was compared with EBSD-derived parameters such as local misorientation, Schmid factor, Schmid factor mismatch, and GB characteristics; and geometric and microstructural factors such as plastic strain, normal/residual stress, and GB characteristics. From analysis of the distribution of EBSD-derived parameters of the cracked and the intact GBs, dominant factors playing an important role in each cracking step are discussed in terms of local strain, normal/residual stress, and grain boundary characteristics.

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Why is it important?

This paper is important because it can be understood the concept of crack initiation of Ni alloy 600 for nuclear power plant.

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