Dong-Woo Suh

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Adding a large amount of light elements such as aluminum to steels is not a new concept recalling that several Fe-Al-Mn-C alloys were patented in 1950s for replacement of nickel or chromium in corrosion resistance steels. However, the so-called lightweight steels or low-density steels were revisited recently, which is driven by demands from the industry(More)
The mechanical stability of austenite in steels which rely on transformation–induced plasticity is usually attributed to its chemical composition, size and shape. We demonstrate here that another factor, the partitioning of strain between phases with different mechanical properties, can dramatically influence the stability.
There are precise observations which indicate the reluctance of excess carbon within bainite or martensite to partition into adjacent austenite in spite of prolonged heat treatment at temperatures where carbon is mobile. To explain this, we report the first calculations of the solubility of carbon in tetragonal ferrite that is in equilibrium with austenite.(More)
Calculations indicate that the introduction of hydrogen into the body–centred cubic and face-centred cubic allotropes of iron in both cases reduces the {100} surface energy. The reduction is rather small in magnitude so this mechanism cannot present the major cause of the well–known hydrogen embrittlement phenomenon. Consistent with the theory of grain(More)
BACKGROUND Diphenylcyclopropenone (DPCP) immunotherapy has been used to treat warts, particularly in patients, such as children, who cannot endure treatment-related pain and in patients with large numbers of warts. However, the efficacy of DPCP immunotherapy remains subject to much controversy. Specifically, cure rates and treatment durations have varied(More)
Cementite dissolution in hypereutectoid steels containing Cr is analyzed using dilatometry combined with the consideration of the carbon content in the austenite. The results suggest that the austenite transformed from the mixture of ferrite and cementite can be approximated to have a carbon content corresponding to equilibrium with ferrite. The overall(More)
We report the mechanistic explanation of the variation in Lüders strain in finegrained transformation-induced plasticity assisted steel. The austenite stability is demonstrated to have a profound influence on the Lüders strain. Furthermore, it is shown unambiguously using a thermodynamic analysis that the transformation of austenite is strain-induced. The(More)
The interphase precipitation of carbides has been studied in two microalloyed steels containing Ti and Nb, but only one of which contains molybdenum. The precipitates obtained are, therefore, (Ti,Nb)C and (Ti,Nb,Mo)C respectively. It is found that molybdenum significantly reduces the size of the carbide precipitates and also strongly retards their(More)
502 Ann Dermatol Received November 22, 2012, Accepted for publication December 5, 2012 Corresponding author: Bark-Lynn Lew, Department of Dermatology, Kyung Hee University Hospital at Gangdong, 892 Dongnam-ro, Gangdong-gu, Seoul 134-727, Korea. Tel: 82-2-440-7329, Fax: 82-2-4407336, E-mail: bellotte@hanmail.net This is an Open Access article distributed(More)