Medium-Mn Steels, a Promising Type of the 3rd Generation Steels
A special issue of Metals (ISSN 2075-4701).
Deadline for manuscript submissions: closed (31 March 2019) | Viewed by 32454
Special Issue Editor
Special Issue Information
Dear Colleagues,
As demonstrated more than a decade ago, ferrite-austenite and martensite-austenite steel microstructures can provide enhanced strength-ductility combinations, improved with the increasing austenite fraction. In addition to the amount of austenite, its stability under deformation is of high importance concerning the transformation-induced plasticity and possible twinning-induced plasticity effects and thereby high ductility.
Fully austenitic TWIP-steels have outstanding properties in terms of strength and ductility combination, but there is a serious problem in terms of mass production of these steel: the high costs not only of the raw materials, but also of the production process. Further, certain embrittlement phenomena have limited their application. For these reasons, the Mn content in the steel needs to be reduced to an industrially appropriate level.
Indeed, medium-Mn steels containing 3%–11% Mn have reached much attention lately. Excellent properties of medium-Mn steels were invented and reported already in the early 1970s, but the interest has recently exploded with respect, particularly, to automotive applications. As such, a material, medium-Mn high-strength and ultra-high strength steels was developed in order to enable lightweight car body design and improved passenger safety features. However, the optimization of medium-Mn steel has, up to now, not been fully addressed due to the complexity of their mechanical properties, which are sensitively dependent on their chemical composition and processing conditions. Despite the apparent success in achieving the desired base metal mechanical properties, very few studies have been performed on the effects of fabrication processes, such as welding, forming, etc.
The exploitation of medium-Mn steels is far from mature and the subject is both scientifically and technologically fascinating. In order to provide an overview on the current state-of-the-art of these advanced steels, a Special Issue of Metals is commissioned and we invite contributions covering different aspects of medium-Mn steels.
Prof. L. Pentti Karjalainen
Guest Editor
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Keywords
- Medium-Mn steel
- Alloying
- Processing
- Austenite
- Retained austenite stability
- Strength
- Ductility
- Fabrication properties
- Automotive applications
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