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Your search keyword '"Hyoung Seok Park"' showing total 2 results
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1. Hydrogen absorption, desorption and embrittlement of Zn and ZnNi-electrodeposited bolts

Author

Sang-Hyun Yu, Ahjeong Lyu, In-Seok Jang, Hyoung Seok Park, Min Jang, Kee Yang Lee, and Young-Kook Lee

Subjects
Automotive bolt, Zinc, Electrodeposition, Hydrogen absorption, Hydrogen embrittlement, Mining engineering. Metallurgy, TN1-997
Abstract

The H contents and H embrittlement (HE) of Zn- and ZnNi-electrodeposited SCM435 bolts were quantitatively evaluated before and after baking. The Zn-coated bolt possessed higher H contents than the ZnNi-coated bolt in as-electrodeposited and baked states. H atoms were strongly trapped inside the coating layers. The Zn-coated bolt underwent flaking of coating layer during baking at temperatures above 200 °C due to H effusion through the brittle δ phase. The Zn-coated bolt exhibited no HE regardless of baking despite of its high H content due to no permeation of H into the steel substrate during electrodeposition and tensile deformation.

Published
2021
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2. Study of the decomposition behavior of retained austenite and the partitioning of alloying elements during tempering in CMnSiAl TRIP steels

Author

Sung-Il Kim, Jae Bok Seol, Chan Gyung Park, Hyoung-Seok Park, and Nam-Suk Lim Lim

Subjects
Austenite, Materials science, Cementite, Bainite, Mechanical Engineering, Metallurgy, Atom probe, Plasticity, law.invention, chemistry.chemical_compound, chemistry, Mechanics of Materials, Transmission electron microscopy, law, Ferrite (iron), lcsh:TA401-492, General Materials Science, lcsh:Materials of engineering and construction. Mechanics of materials, Tempering
Abstract

Tempering approach is designed for better understanding the effects of heat treatment induced by production process when manufacturing on the transformation-induced plasticity steels containing 1.0 wt.% Al. Specific attention is placed on the roles of tempering temperature and the holding time on the decomposition of retained austenite and the redistribution of alloying elements. Using transmission electron microscopy, we found the retained austenite was decomposed into ε-carbide and ferrite in the steels tempered at 300 °C for 9 h. An increase in the temperature of 400 °C and the holding time over 3 h accelerate the nucleation kinetics of cementite formation, leading to the deteriorated thermal stability of austenite. In addition, atom probe tomography studies confirmed the partitioning tendency of alloying elements across the ferrite/cementite interfaces as well as the compositional spikes of Mn at the interfaces during tempering over 400 °C for 9 h. Keywords: Transformation-induced plasticity steels, Retained austenite, Decomposition, Atom probe tomography

Published
2015

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