On the mechanical properties and deformation mechanisms of manganese sulphide inclusions

Manganese sulphide (MnS) inclusions are present in many steels. Some are deliberately introduced to increase machinability (Ånmark et al., 2015 [1]), for example in case-hardened 16MnCrS5. Others are present to the detriment of mechanical behaviour, causing anisotropic properties, a reduction in fatigue resistance as well as the formation of deformation-induced voids during forming. In order to improve the performance of MnS-containing steels, the mechanical properties and deformation mechanisms of these inclusions need to be understood. Due to their small size, micro-mechanical testing using nanoindentation and micropillar compression was performed in order to study the properties of MnS.1101¯10-type slip systems were, in accordance with literature, found as the primary slip system. For specific orientations with low Schmid factors for these systems, however, slip on {100} planes could be activated in micropillar compression, and for both obtained systems, the critical resolved shear stresses for their activation was measured. These findings were subsequently confirmed by electron backscatter-diffraction on cross-sections of deformed micropillars.

Abstract licence: CC BY-NC-ND

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