석출강화형 극저탄소강의 특성에 대한 고찰 (Characteristics of Precipitation Hardened Extra Low Carbon Steels)

서지정보

· 발행기관 : 대한금속·재료학회
· 수록지 정보 : 대한금속·재료학회지 / 46권 / 10호 / 609 ~ 616페이지
· 저자명 : 윤정봉, 김성일, 김인배

초록

Conventional bake-hardenable(BH) steels should be annealed at higher temperatures because of the
addition of Ti or/and Nb which forms carbides and raises recrystallization start temperature. In this study, the
development of new BH steels without Ti or Nb addition has been reviewed. The new BH steels have nearly
same mechanical properties as the conventional BH steels even though it is annealed at lower temperature. The
steels also show smaller deviation of the mechanical properties than that of the conventional BH steels because
of the conarol of solute carbon content during steel making processes. The deviation of mechanical properties
in conventional BH steels is directly dependent on the deviation of solute carbon which is greatly influenced by
the amount of the carbide formers in conventional BH steels. Less alloy addition in the newly developed BH
steels gives economical benefits. By taking the advantage of sulfur and/or nitrogen which scarenge in Interstitial-
Free or conventional BH steels, fine manganese sulfides or nano size copper sulfides were designed to precipitate,
and result in refined ferrite grains. Aluminum nitrides used as a precipitation hardening element in the
developed steels were also and resull in fine and well dispersed. As a result, the developed steels with less
production cost and reduced deviation of mechanical properties are under commercial production. Note that the
developed BH steels are registered as a brand name of MAFE® and/or MAF-E®.

영어초록

Conventional bake-hardenable(BH) steels should be annealed at higher temperatures because of the
addition of Ti or/and Nb which forms carbides and raises recrystallization start temperature. In this study, the
development of new BH steels without Ti or Nb addition has been reviewed. The new BH steels have nearly
same mechanical properties as the conventional BH steels even though it is annealed at lower temperature. The
steels also show smaller deviation of the mechanical properties than that of the conventional BH steels because
of the conarol of solute carbon content during steel making processes. The deviation of mechanical properties
in conventional BH steels is directly dependent on the deviation of solute carbon which is greatly influenced by
the amount of the carbide formers in conventional BH steels. Less alloy addition in the newly developed BH
steels gives economical benefits. By taking the advantage of sulfur and/or nitrogen which scarenge in Interstitial-
Free or conventional BH steels, fine manganese sulfides or nano size copper sulfides were designed to precipitate,
and result in refined ferrite grains. Aluminum nitrides used as a precipitation hardening element in the
developed steels were also and resull in fine and well dispersed. As a result, the developed steels with less
production cost and reduced deviation of mechanical properties are under commercial production. Note that the
developed BH steels are registered as a brand name of MAFE® and/or MAF-E®.

참고자료

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