Experimental and numerical study of micromechanical damage induced by MnS-based inclusions

0561614 - ÚFM 2023 RIV CH eng J - Journal Article
Tinoco Navaro, Hector Andres - Fintová, Stanislava - Heikkila, I. - Herrero, D. - Vuoristo, T. - Dlouhý, Ivo - Hutař, Pavel
Experimental and numerical study of micromechanical damage induced by MnS-based inclusions.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 856, OCT (2022), č. článku 144009. ISSN 0921-5093. E-ISSN 1873-4936
EU Projects: European Commission(XE) 747266 - RFCS-02-2016
Program: INNOFAT
Institutional support: RVO:68081723
Keywords : Inclusions * MnS * Microtensile tests * Fatigue * Finite element analysis * Nanoindentation
OECD category: Materials engineering
Impact factor: 6.4, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0921509322013880?via%3Dihub

The study is focused on the characterization of three microalloyed 38MnSiV6 steel variants in terms of microstructure, mechanical properties, and crack initiation. Conventional steel was used as reference material, while the two other variants with reduced sulfur content and Bi or Se addition were prepared. To determine the influence of the non-metallic inclusions present in the rolled round bars, hardness, tensile, impact toughness, and fatigue properties were examined longitudinally and transversally to the rolling direction. To describe the local strain and deformation around the inclusions during the microtensile tests, scanning electron microscope monitoring was adopted. Finite element analysis was applied to model strain/stress localization around inclusions during the microtensile tests. Modeling was performed in two solutions stages involving a macro-model (microtensile sample) and micro-model (inclusions). The comparison of the numerical analysis with the microstructural observations during microtensile tests showed a good agreement. The MnS and MnSeS inclusions were responsible for the intensive strain localization and subsequent crack initiation, while the Bi-MnS inclusions were not involved in this process.
Permanent Link: https://hdl.handle.net/11104/0334353