Abstract
The Electron Backscattered Diffraction (EBSD) was used to study the distribution of low and high angle boundaries and coincidence site lattice (CSL) grain boundaries of 316L cladding, which were in four different conditions (explosive condition, 580 °C–3 h, 720 °C–1.5 h and 900 °C–0.5 h). Polarization curves and intergranular corrosion tests were used to test the corrosion resistance of 316L stainless steel composite plate in four conditions. The results showed that there were substructures in explosive samples, and the internal substructures gradually disappear after heat treatment. The fraction of low-angle grain boundaries of the explosive condition, 580 °C, 720 °C and 900 °C samples were 15.76%, 3.77%, 2.32% and 5.52%, respectively. The corrosion potential of 316L treated by 900 °C–0.5 h was the highest (−0.196 V). The result of intergranular corrosion test shows that the sum of two stages of 900 °C–0.5 h heat treatment was the lowest (274.048 g.(m2.h)−1). The quantity and the fraction of special grain boundaries of different conditions can influence the corrosion resistance of 316L composite plate. The fraction of low ΣCSL (CSL ≤ 29) grain boundaries of sample treated by 900 °C–0.5 h is the highest (67%), meanwhile, its corrosion resistance is the most excellent.
Published Version
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