Comparison With Microstructure and Property of Low Carbon Steel With and Without Boron Produced by Compact Strip Production

摘要

The effect of boron in hot strip of low carbon steel produced by CSP in order to reduce the strength to some degree was investigated in steels with different boron contents, the effect of which is quite different from that in high strength low alloy steel. The mechanical properties and development of microstructure of the hot strip were studied using optical microscopy and tensile tests. By means of an electrolytic dissolution technique and Thermo -Cal calculation, the precipitates containing boron were analyzed and detected. From electron back-scattered diffraction analysis, it can be known that whether the microstructure recrystallized or not. Furthermore, the effect of boron segregation on recrystallization or non-recrystallization conditions can be distinguished. A comparison was made among the segregation behaviors of the boron in steels with or without boron contents. The non -equilibrium segregation of boron during processing is discussed on the basis of the forming complexes with vacancies that migrate to the boundaries prior to annihilation.