Effect of Trace Boron on Low Temperature Impact Toughness of Hot-Rolled Nb-Added HSLA H-Beams

Guo Tao Cui; Zuo Cheng Wang; Tao Sun; Wei Min Guo; Jun Qing Gao

doi:10.4028/www.scientific.net/AMM.174-177.1030

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Effect of Trace Boron on Low Temperature Impact Toughness of Hot-Rolled Nb-Added HSLA H-Beams
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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 174-177Effect of Trace Boron on Low Temperature Impact...

Effect of Trace Boron on Low Temperature Impact Toughness of Hot-Rolled Nb-Added HSLA H-Beams

Abstract:

In this research, trace boron (4ppm, 8ppm, 11ppm) was added into the Nb-added HSLA H-beams. The impact toughness of H-beams with/without boron was examined by Charpy impact test (V-notch). The morphologies of the microstructure and the fracture surfaces of the impact specimens were observed by metalloscope, stereomicroscope and electron probe. The experimental results prove that the absorbed impact energy at -40°C for the 4ppm, 8ppm, 11ppm boron-added steels respectively reaches up to 80J, 126J, 85J from 15J and H-beams with boron have a lower FATT than that without boron. It is also found that the total oxygen content affects the absorbed impact energy to a certain extent. It is discovered by transmission electron microscope (TEM) that boron mainly exists in solid solution state, except that a little amount of Fe₂₃(C, B)₆ is formed at the grain boundaries, and the distribution of Nb(C, N) is also influenced by boron addition.