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Cite this article:
. . Acta Metall Sin, 2007, 43(10): 1082-1090 .
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Abstract The experimental steel is a kind of Nb、Ti complex microalloyed steel produced by using thin slab casting and direct rolling process. Comprehensive microstructural analyses were conducted and strengthening mechanisms were studied for its two hot rolled coils: coil 059 with higher yield strength and coil 066 with lower yield strength. The results show that both coils mainly consist of ferrite microstructure. The ferrite of coil 059 presents non-ploygonal ferrite morphology which is with finer grain size and higher dislocation density. Both coils have the same precipitation characters. A large number of complex star-like precipitates exist in both coils, which have an average size of 140~150nm and account for 50% Nb of the total. Ferrite grain refinement strengthening is the first mechanism contributing 43~46% to total yield strength. Precipitation strengthening effect is weak, whether in coil 059 with higher yield strength or in coil 066 with lower yield strength, which only accounts for 4~6% of total yield strength. Dislocation strengthening and grain refinement strengthening makes coil 059 with the higher yield strength.
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Received: 04 December 2006
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