Experimental investigation on segregation and remelting behaviors of boron-containing steel with low carbon

Publication date: March 2019Source: Results in Physics, Volume 12Author(s): Hangyu Zhu, Jian Sun, Wei Wang, Weisheng Wang, Jialiu Lei, Zhengliang XueAbstractBoron in low carbon steel can improve hardenability and hot ductility remarkably. However, defects including cracks, internal half way cracks, and even breakouts commonly appear during the continuous casting process, due to the segregation and remelting behaviors of boron-containing steel. In the present investigation, morphology characteristics around the crack were observed by optical microscope (OM). The segregation and distribution of boron around grain boundary were observed by secondary ion mass spectroscopy (SIMS), and the remelting phenomenon around the crack was observed by the high temperature confocal laser scanning microscope (CLSM). Results show that BN particles are detected in the crack region, Boron is concentrated at grain boundaries. Due to the boron segregation, liquid phase is observed at 1420–1400 °C and 1340–1330 °C in cooling process with boron content even of 0.0013 wt%. The low and high temperature brittle zones are revealed based on boron segregation and remelting behavior.

Source: Results in Physics - November 25, 2018 Category: Physics Source Type: research