Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effect of Nb Contents and Processing Parameters on Dynamic Recrystallization Behavior of 0.15C-0.2Si-0.5Mn Low-Carbon Steels

0.15C-0.2Si-0.5Mn 저탄소강의 동적 재결정 거동에 미치는 Nb 첨가와 공정 변수의 영향

  • Lee, Sang-In (Department of Materials Science and Engineering Seoul National University of Science and Technology) ;
  • Seo, Ha-Neul (Department of Materials Science and Engineering Seoul National University of Science and Technology) ;
  • Lee, Jae-Seung (Pohang Research Lab, Technical Research Laboratories, POSCO) ;
  • Hwang, Byoungchul (Department of Materials Science and Engineering Seoul National University of Science and Technology)
  • 이상인 (서울과학기술대학교 신소재공학과) ;
  • 서하늘 (서울과학기술대학교 신소재공학과) ;
  • 이재승 (포스코 기술연구원 포항연구소) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2016.07.08
  • Accepted : 2016.08.11
  • Published : 2016.09.30
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Abstract

In this study, the effect of Nb contents and processing parameters on dynamic recrystallization behaviour of 0.15C-0.2Si-0.5Mn low-carbon steels was investigated. Three kinds of steel specimens with different Nb contents were fabricated and then high-temperature compressive deformation test was conducted by varying reheating temperature (RT), deformation temperature (DT), and strain rate (SR). The Nb2 and Nb4 specimens containing Nb had smaller prior austenite grain size than the Nb0 specimens, presumably due to pinning effect by the formation of carbides and carbonitrides precipitates at austenite grain boundaries. The high-temperature compressive deformation test results showed that dynamic recrystallization behavior was suppressed in the specimens containing Nb as the strain rate increased and deformation temperature decreased because of pinning effect by precipitates, grain boundary dragging effects by solute atoms, although the compressive stress increased with increasing strain rate and decreasing deformation temperature.

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