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Effects of Nitrogen and Precipitates on the Mechanical Properties of 26Cr-2Mo Superferritic Stainless Steel Welds  

황의순 (한양대학교 공과대학 재료공학부, 철강공정 및 응용연구소)
이하미 (한양대학교 공과대학 재료공학부, 철강공정 및 응용연구소)
김성욱 (한양대학교 공과대학 재료공학부, 철강공정 및 응용연구소)
서영대 (한양대학교 공과대학 재료공학부, 철강공정 및 응용연구소)
이창희 (한양대학교 공과대학 재료공학부, 철강공정 및 응용연구소)
안상곤 (POSCO 기술연구소)
이용득 (POSCO 기술연구소)
Publication Information
Journal of Welding and Joining / v.20, no.5, 2002 , pp. 63-71 More about this Journal
Abstract
One of the shortcoming of ferritic stainless steels is their limited toughness. The most important factor governing the toughness of ferritic stainless steels is hewn to be their interstitial contents. Due to the limited solubility of carbon and nitrogen in the ferrite matrix, it is difficult to avoid carbide and nitride precipitates. In the study, the role of nitrogen on the toughness of 260r-2Mo superferritic stainless steel welds has been investigated using alloys containing various nitrogen levels between 100 and 1640 ppm. Mechanical properties of weld metals have been evaluated by microhardness, Charpy impact test and notch tensile test. The alloys are mainly embrittled by the grain boundary and intragranular nitride precipitation. Grain boundary precipitates are considered to be more deleterious than intrauanular nitrides. Fracture mechanism have been elucidated through microscopic evaluation of notch tensile test
Keywords
Toughness; 26Cr-2Mo Superferritic stainless steel; Carbide; Intragranular/intergranular nitride; Precipitates;
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