Investigation on the hot ductility of Q235 low-carbon steel with boron addition Jixuan

We tested the mechanical properties of B-containing steel at 600-1300 degrees C using Gleeble 1500, and the hot ductility was investigated according to the reduction in area (RA). The fractured specimens were examined using scanning electron microscopy. The results indicate that boron strongly influences the hot ductility of B-containing steel in comparison with B-free Q235 steel. Boron could expand the low temperature embrittlement range from 750-850 degrees C to 700-1000 degrees C, and lead to a worse hot ductility at 1150 degrees C, related to its re-melting property. The reduction in area is as low as 18% at 1300 degrees C, and the high temperature embrittlement zone is inevitable given the existence of residual solute phase between dendrites.