Abstract
Stress corrosion cracking (SCC) is extremely detrimental to the long-term applications of high-strength low-alloy steels. In this work, the critical effects of the dimension and morphology of the non-metallic inclusions on the SCC susceptibility and pitting corrosion were investigated. With the trace-element regional supply method, the inclusions are transformed from the detrimental sharp-edged (Ti, V)N and enormous MnS into globular or elliptical Al2O3 and multicomponent inclusions with small dimensions (3.41 ± 2.36 μm) and high equivalent shape factor (0.93 ± 0.02) in the in-situ nanoparticles strengthened steel. As a result, the corrosion current, depth and diameter of pits, and roughness of the surface were reduced with suppression of pitting corrosion. The superior SCC resistance in the in-situ nanoparticles strengthened steel was obtained by inclusion refinement. The strategy of inclusion refinement by in-situ nanoparticles is beneficial for designing SCC resistant steels.
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