Synergism between B and Nb Improves Fire Resistance in Microalloyed Steels
نویسندگان
چکیده
The long exposure of structural components to high temperatures (above 600 °C) negatively changes their mechanical properties, severely compromising the capacity buildings and other structures in which safety is a primary concern. Developing new cheaper fire-resistant steels with better thermal performances represents challenging, cutting-edge materials science engineering research topic. Alloying elements such as Nb Mo are generally used improve strength at both room due formation precipitates harder microconstituents. This study shows that adding small amounts boron Nb-microalloyed may be crucial maintaining properties temperatures. widely 66% yield-strength criteria for fire resistance was achieved ≈574 °C B-added alloys. In contrast, those without boron, this value reached ≈460 °C, representing remarkable boron-induced strengthening enhancement. First-principles quantum mechanics calculations demonstrate additions can lower 11.7% vacancy energy compared pure ferrite. Furthermore, Nb-added steels, reduction reach 33.2%, suggesting boron-niobium combination could act an effective pinning-based steel-strengthening agent B-induced higher-density vacancy-related crystalline defects, well well-known steel mechanisms reported literature. Adding niobium may, therefore, essential designing
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ژورنال
عنوان ژورنال: Metals
سال: 2022
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met13010084