Proceedings of the Korean Society for Technology of Plasticity Conference (한국소성가공학회:학술대회논문집)
- 2009.05a
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- Pages.274-277
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- 2009
저탄소 마르텐사이트 강의 냉간압연과 온간압연을 통한 미세조직 개질
- Lee, Jong-Cheol ;
- Gang, Ui-Gu ;
- Lee, Jung-Won ;
- O, Chang-Seok (KIMS) ;
- Kim, Seong-Jun (KIMS) ;
- Nam, Won-Jong
- Published : 2009.05.07
Abstract
There have been a number of works on manufacturing ultrafine grained steels with average ferrite grain sizes of smaller than a few micrometers to develop beneficial high strength steels. Among microstructures in low carbon steels, lath martensite is known to be useful to produce an ultrafine grained ferrite matrix and finely globular cementite particle. Thus, severe plastic deformation and subsequent annealing at lower temperature of lath martensite would become an effective way to produce ultrafine grained steels. However, most ultrafine grained steels exhibited a total elongation of a few per cent in tensile tests. Such a defect is one of the primary factors restricting the potential applications of ultrafine grained steels. Therefore, the improvement of the strength-elongation balance is required for the application of ultrafine grained structural steels. In this study, the effect of deformation temperatures on microstructure, such as ferrite grain size and the distribution of cementite particles, and mechanical property of lath martensite steels, was investigated. Specimens were fabricated through cold rolling or warm rolling and subsequent annealing.