Abstract
Titanium and magnesium additions singly and together were examined in 4130. A thermal analysis system measured the cooling rate of molten steel samples. These curves were analyzed for changes in phases evolved and phase reactions. The samples were also sectioned to determine the solidification structure. All additions refined the structure; however, magnesium and titanium additions together resulted in the finest structure. The peritectic reaction temperature was found to decrease with the additions. This decline may indicate an increase in the δ-ferrite stability due to favorable nucleation of that phase. The solidus temperature also appeared to decline. Inclusion analysis found TiN particles in the magnesium/titanium-containing sample. Only titanium-containing oxides were observed in the titanium-only samples. It appeared that the addition of magnesium made the formation of TiN more favorable.
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Acknowledgments
The author wishes to thank several people for their support of this work. First, the Office of Naval Research’s support through Award Number N000141712766 is graciously acknowledged. MeltLab’s continued programming and technical discussion help has significantly contributed to the success of this research. Tyler Schramski, Hunter Towalski, Het Kapadia, and Kaylee Konwinski tirelessly worked in the laboratories providing data and sample preparation assistance. FOSECO’s countless donations of various consumables for our foundry are also appreciated. Finally, Jennie Tuttle’s editorial and personal support have, and continue to be, the foundation of any work by the author.
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Tuttle, R. Thermal Analysis Experiments in Titanium and Magnesium Additions to 4130 Steel. J. of Materi Eng and Perform 29, 5913–5922 (2020). https://doi.org/10.1007/s11665-020-05065-5
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DOI: https://doi.org/10.1007/s11665-020-05065-5