Does anyone know what the role of magnesium is in the chemical composition of steel? Does it increase the corrosion resistance of steel?
Magnesium has little solubility in molten steel as same as calcium. Magnesium takes almost no outstanding role for property of steel but it works for improving cleanliness and controlling the morphology of inclusions, as desulfurizer and deoxidizer agent.
Magnesium is used in alloys because it is a light metal, which improves the mechanical properties of steels. At the same time, the strength and hardness also increase, while the relative elongation and impact toughness decrease. It is also used in alloys with iron, which improves its strength and ductility. In addition, magnesium mixed with lime is injected into liquid blast iron, improving the mechanical properties of steel. However, its use in alloys has decreased due to its tendency to corrode at high temperatures. The main application of steels with the presence of Mg is present in the production of sheet materials for ships, storage tanks, boilers, bridge structures, etc. due to the improved welding properties.
The effects on mechanical properties by magnesium addition in steel is expected as the results of grain refining accompanied by precipitation strengthening or dispersion strengthening when the fine inclusions are scattered in the matrix. The effects would not be considered to come directly from atomic magnesium itself because of less solubility into steel.@
Dear Hamed Bahmanabadi thank you for your interesting technical question. In addition to the links which have already been suggested, please also have a look at the following potentially useful article which might help you in your analysis:
Effects of Magnesium on Wear Resistance of H13 Steel
https://www.jim.or.jp/journal/e/pdf3/55/07/1104.pdf
This article is freely available as public full text (see attached pdf file).
Also please see:
Effect of magnesium addition in low carbon steel part 2: toughness and microstructure of the simulated coarse-grained heat-affected zone
Article Effect of magnesium addition in low carbon steel part 2: tou...
Unfortunately this paper has not been posted as public full text on RG, but perhaps you can access it though your institution. Alternatively you can request the full text directly from the authors via RG.
Good luck with your research and please stay safe and healthy!
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