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http://dx.doi.org/10.12656/jksht.2020.33.2.57

The Effects of Surface Oxidation Occurring during Delivery from an Annealing Furnace to a Water Bath on the Microstructure and Tensile Properties of TWIP Steel  

Oh, Seon-Keun (Department of Materials Science and Engineering, Yonsei University)
Lee, Young-Kook (Department of Materials Science and Engineering, Yonsei University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.33, no.2, 2020 , pp. 57-64 More about this Journal
Abstract
In the present study, we investigated whether the surface oxidation of C-bearing TWIP steel ℃curs in the air during specimen delivery from an annealing furnace to a water bath and how the microstructure and tensile properties are influenced by surface oxidation. A cold-rolled Fe-18Mn-0.6 (wt%) steel was exposed in the air for 5 s after annealing at various temperatures (750℃, 850℃ and 1000℃) for 10 min in a vacuum, and then water-quenched. For comparison, another specimen, which had been quartz-sealed in a vacuum, was annealed at 1000℃ for 10 min and immediately water-quenched without exposure to air. The 750℃ and 850℃-annealed specimens and the quartz-sealed specimen showed a γ-austenite single phase in the entire specimen due to negligible surface oxidation. However, the 1000℃-annealed specimen exhibited a dual-phase microstructure consisting of ε-martensite and γ-austenite at the sub-surface due to decarburization. Whereas the specimens without decarburization revealed high elongations of 70-80%, the decarburized specimen exhibited a low elongation of ~40%, indicating premature failure due to cracking inside the decarburized layer with ε-martensite and γ-austenite.
Keywords
TWIP steel; Tensile properties; Decarburization; Oxidation; Microstructure;
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