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http://dx.doi.org/10.12656/jksht.2015.28.1.1

Ductile-to-Brittle Transition Behavior of Two Austenitic Fe-18Cr-10Mn Alloys with the Combined Addition of Nitrogen and Carbon  

Lee, S.Y. (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Kim, B.Y. (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Hwang, B. (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korean Society for Heat Treatment / v.28, no.1, 2015 , pp. 1-6 More about this Journal
Abstract
The ductile-to-brittle transition behavior of two austenitic Fe-18Cr-10Mn alloys with the combined addition of nitrogen and carbon was investigated in this study. The alloys exhibited a ductile-to-brittle transition behavior because of unusual brittle fracture at low temperatures unlike conventional austenitic alloys. The alloy with higher carbon content had higher yield and tensile strengths than that with lower carbon content due to the solid solution strengthening effect resulting from carbon addition. However, the increase in carbon content promoted the occurrence of intergranular fracture, and thus deteriorated the impact toughness. In order to develop successfully the austenitic Fe-18Cr-10Mn alloys with the excellent combination of strength and toughness in the future, therefore, more systematic studies are required to find the appropriate amount and ratio of nitrogen and carbon.
Keywords
Ductile-to-brittle transition; Low-temperature brittle fracture; Austenitic alloys; Carbon; Impact toughness;
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