5th International High Manganese Steel Conference - HMNS 2022

Understanding the deformation behavior of metals over a wide range of strain rates is of critical importance in a variety of engineering applications, such as vehicle collision, projectile penetration, explosion shock, and so on. Decades ago, studies on the strain rate dependent deformation behavior of various metals, including bcc metals (e.g. pure iron), fcc metals (e.g. Cu, Ni), and hcp...

While excellent compromise of strength and ductility of Medium Mn third generation steels are well known and deeply studied, the understanding of intergranular brittleness observed at different stages of the manufacturing process remains a major challenge for the industrialization of these new steels. Recent studies carried out at ArcelorMittal on a third generation Medium Mn 0.15C-4Mn-1.5Si...

Press hardening of manganese-boron steels is one of the most efficient production processes for high strength automotive components. However, the residual formability of these sheet components is greatly limited by the formation of fully martensitic microstructure during in-die quenching, which makes them only to a limited extent suitable for crash-relevant anti-intrusion parts of the vehicle...

The effect of QP heat treatment on the phase transformation of Fe-8Mn-2.5Al-0.5Si-0.2C-1.6Cu (in wt.%) medium manganese steel was studied by thermal dilatometer and EBSD characterization. It was found that the key factor determining the microstructure (phase content) of QP heat treatment of medium manganese steel is quenching temperature. When the quenching temperature is low, a small amount...

Quenching and partitioning (Q&P) process has shown a great potential to achieve enhanced tensile properties in advanced high strength steel (AHSS). It is primarily attributed to the retained austenite in martensitic matrix that exhibits TRIP effect. In order to obtain austenite in the final microstructure, the cold-rolled steel is austenitized and then quenched to the temperature between Ms...

During the last years, Quenching and Partitioning (Q&P) steels have gained strong interest in the steel industry due to their promising lightweight potential and crashworthiness. With their microstructure consisting of tempered martensite (α’’) and C-enriched retained austenite (RA), they are characterized by balanced ductility characteristics, which close the gap between the conventional Dual...

In a thermal cycle consisting of a quenching and partitioning (Q&P) process, followed by a subsequent galvannealing process, the effect of Si and Al especially on the retained austenite in the microstructure was investigated by two alloy concepts 0.2C-4Mn-1.5Si and 0.2C-4Mn-1.5Al. Thereby the influence of a replacement of the alloy element Si by Al and their carbide retarding effect was...

As medium manganese steels are often treated in the intercritical domain to obtain bimodal retained austenite and ferrite microstructures, the application of a quenching and partitioning treatment to a medium manganese steel also promotes the retention of austenite at room temperature via carbon partitioning from martensite to austenite and by the austenite stabilizing effect of manganese in...