Micromechanical testing for quantitative characterization of apparent slip system: Extinction of persistence of slip in carbon bearing Fe-3% Si

The effect of carbon on the persistence of the slip in Fe-3 mass% Si was investigated. We applied micro-sized cantilever bending tests to obtain psi-chi relationships that enable quantitative analysis of the persistence of the slip. It was demonstrated that the result from decarburized specimens using this method is consistent with those obtained in previous studies from bulk-sized tensile test specimens. This novel method eliminates the difficulty of preparing bulk-sized single-crystal specimens for investigating the persistence of the slip. The persistence of the slip weakened in aged specimens containing 0.016 mass% C and disappeared in quenched specimens with the same carbon content, where wavy slip bands were observed. The reason for these changes in the macroscopically apparent slip plane is explained by the assumption that the frequency of nucleating kink-pair in the competitive {110} planes is a function of the resolved shear stress.

Automated summary

The effect of carbon on the persistence of slip in Fe-3 mass% Si was studied using micro-sized cantilever bending tests. The obtained psi-chi relationship allowed for quantitative analysis of slip persistence. The results from decarburized specimens were consistent with previous studies using bulk-sized tensile test specimens, providing an alternative method for investigating slip persistence. The slip persistence weakened in aged specimens containing 0.016 mass% C and disappeared in quenched specimens with the same carbon content, indicating a relationship between slip persistence and resolved shear stress in competitive {110} planes.