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고장력 냉연강판에서 미세조직에 대한 연속어닐링 조건의 영향
정우창 ( Woo Chang Jeong ) 한국열처리공학회 2004 熱處理工學會誌 Vol.17 No.5
N/A The effect of the annealing parameters on microstructures were examined in a cold-rolled high strength steel containing 0.1% C, 0.5% Si, 1.5% Mn, and 0.04% Nb. It was impossible to avoid martensite in the microstructure even though the continuous annealing parameters were controlled. This indicates that the alloying elements such as silicon and manganese contributing to manganese equivalent (Mn_(eq)) should be reduced to pro-duce the ferrite-pearlite microstructure for the solid solution and precipitation hardened steel. It was found that a decrease in the rapid cooling temperature to 520℃ was effective to change the microstructure from ferrite-martensite to ferrite-pearlite-martensite. Typical dual-phase properties exhibiting a low yield ratio and a continuous yielding behavior were obtained when the rapid cooling temperature was in the range of 680℃ to 600℃. The critical volume fraction of martensite for the typical properties of dual-phase steel was about 11 percent.