5th International High Manganese Steel Conference - HMNS 2022

Influence of nitrogen and carbon on mechanical properties of TWIP steels depending on grain size has been controversially discussed. In addition, especially in high manganese steels, the temperature dependence of the stacking fault energy can lead to the activation or suppression of different deformation mechanisms during a pre-deformation. In this way, a complex interaction between...

Hadfield steel shows high strain hardening which can be linked to its ability to form twins during mechanical loading. Twinning in Hadfield steel is well documented. However, detwinning in Hadfield steel is only barely investigated but might be an essential effect as during cyclic loading detwinning provides an additional contribution to plastic deformation.
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In order to reduce the vehicles weight constructors are focusing on stronger or lighter materials.
High Mn lightweight steels could be a response to both demands due to high mechanical properties (Yield Strength up to almost 1000 MPa) and low density (15% lower than a standard Hadfield steel and 16% lower than a typical stainless austenitic steel like AISI 306L).
Lightweight steels undergo...

The aim of the presentation is the explanation and description of structural phenomena occurring in high manganese steels with TWIP effect during dynamic deformation, taking into account the heat generated during the deformation and structure changes depending on the stacking- fault energy (SFE) affected by chemical composition. It has been assumed that the ability to activate specific...

The transformation stasis (TS) phenomenon refers to the occurrence of incomplete transformation by exhaustion of a driving force while a phase transformation proceeds, which was observed during isothermal bainitic transformation. However, in the present study, the TS phenomenon was observed during athermal γ austenite → ε martensitic transformation in a high Mn alloy. Namely, γ → ε martensitic...

Metal additive manufacturing (AM) received enhanced scientific and industrial importance during the last decades, mostly due to the geometrical flexibility offered by AM. The development of novel, process-adapted metallic alloys is a key for further industrial implementation of AM. We address the computational and experimental development of new high-manganese steels with properties superior...

High-manganese steels (HMnS), which are the member of advanced high-strength steel (AHSS) class, stand out due to their ability to exhibit both high strength and ductility. They are identified as promising alloys for additive manufacturing, which is a novel method enabling the production of metallic structures with complex geometries such as lattice (cellular) structures for lightweight...

In situ tensile and reversed cyclic tests were run on a TWIP steel in a SEM, with High-Resolution Digital Image Correlation (HR-DIC) measurements of the plastic strain field in a few selected grains prone to twinning, with a spatial resolution between 150 and 250nm, or under an AFM, with measurements of surface steps height at emerging deformation twins. Evidences of detwinning upon load...