Abstract
The influence of boron on solid-state phase transformation temperatures and grain size in IF steel was investigated. The results show that boron can segregate at the grain boundaries of the IF steel doped with boron during the cooling process. Compared with the specimen without boron, the grain size of specimen with 34-ppm boron is large and its Brinell hardness is relatively small, 216 μm and 59.8HB, respectively. Moreover, the addition of boron in IF steel can rotate the grains toward the [001] orientation, decrease the phase transformation temperature from austenite to ferrite and increase its phase transformation activation energy during the cooling process. According to the experimental results, during the cooling process, the addition of 34-ppm boron in IF steel can reduce the peak temperature of phase transformation by 3.44 K ~ 6.67 K and increase the phase transformation activation energy by 318.59KJ/mol.
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