What is it about?
During the inter-critical annealing of the Medium-High Mn steels with austenitic-martensitic structure, Mn tends to partition from martensite to austenite. On the other hand, the Mn concentration of austenite plays an important role in determining the austenite stability and consequently the mechanical properties of the steel after annealing. Therefore, the estimation of the Mn partitioning in these steels is essential. In this regard, this research introduces a cost-effective method to trace the Mn partitioning, which is based on the dependence of the Curie temperature on the Mn concentration of the martensite as the magnetic phase.
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Why is it important?
The Mn concentration is usually determined by means of atom probe tomography (APT) or energy-dispersive spectroscopy (EDS) in transmission electron microscope (TEM), which both are time-consuming and require special specimen preparation. On the other hand, the introduced method in the current research employs the dilatometry experiments, which is much faster compared to the previous technics.
Perspectives
As the industrial point of view, the cost-effective and time-saving methods are often appreciated. In the case the accurate estimation of Mn concentration would not be needed, the introduced method will be interested.
Pedram Dastur
The Complex Laboratory of Hot Deformation & Thermo-Mechanical Processing of High Performance Engineering Materials, School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran, Iran
Read the Original
This page is a summary of: Nanoscale partitioning of Mn between austenite and martensite revealed by Curie temperature variations, Philosophical Magazine Letters, May 2018, Taylor & Francis,
DOI: 10.1080/09500839.2018.1465238.
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