Graduate Institute ofFerrous Technology



[SSL] Prof. Sung-Joon Kim: Fe-Zn reaction and its influence on microcracks during hot tensile
GIFT 18-12-31 16:28


Fe-Zn reaction was investigated by annealing a galvanized 22MnB5 steel sheet at 500–900 ° C for 5 min. The observed Fe-Zn intermetallic compounds within the coating depended on the annealing temperature. As the temperature increased, the coating phase changed from δ via Γ1 to Zn-rich ferrite. At the temperature lower than or equal to 700 ° C, Zn seems to have diffused along the grain boundaries of substrate, which formed fine Zn-rich ferrite grains. Annealing at higher temperature produced coarse Zn-rich ferrite grains which contributed to significant thickening of the coating layer. By tensile straining at the annealing temperature, it was found that the fine Zn-rich ferrite along the grain boundaries was the origin of the microcracks in the substrate.

2019 Surf.Coating 강지현.pdf 107회 (3.1M) 2018-12-31 16:28:52

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[CTL] Prof. Jung-Wook Cho: oxide metallurgy during AM

 In laser metal deposition (LMD) process, meltpool oxidation is inevitable due to high working temperature, which results in finely dispersed non-metallic inclusions in the steel matrix. In this paper, cha…

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