| 引用本文: | 程震,于敏,缑瑞宾,贾盛康.局部火烤对Q355B钢板抗拉性能的影响规律研究[J].材料科学与工艺,2025,33(6):86-96.DOI:10.11951/j.issn.1005-0299.20240147. |
| CHENG Zhen,YU Min,GOU Ruibin,JIA Shengkang.Study on the influence of local fire baking on the tensile properties of Q355B steel plate[J].Materials Science and Technology,2025,33(6):86-96.DOI:10.11951/j.issn.1005-0299.20240147. |
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| 摘要: |
| 为了揭示局部火烤对Q355B钢板抗拉性能的影响规律,通过火烤处理、拉伸实验、组织与断口分析,结合铁素体平均晶粒尺寸测量结果,对受火后Q355B钢板抗拉性能的变化规律进行研究。结果表明,吸热功率对钢板铁素体晶粒尺寸影响显著,当峰值温度不超过600 ℃时,吸热功率使钢板的铁素体晶粒尺寸减小；吸热功率使各板的强度升高,与母材相比,屈服强度和抗拉强度最大增幅分别为15.7%和6.5%,这是由于铁素体晶粒尺寸减小所致。火源点处抗拉强度与吸热功率呈负相关,火源点外抗拉强度与吸热功率无明显关联；各板的屈服强度都随着距火源点距离的增加呈现先降低后平稳的趋势,但各板抗拉强度的变化规律不同,当吸热功率低于0.27 J/min时,抗拉强度对距离不敏感,而当吸热功率超过0.27 J/min时,抗拉强度则与距离正相关。本文的研究结果可为改善钢板的力学性能和火灾后钢板的重复利用提供参考。 |
| 关键词: 局部火烤 铁素体晶粒尺寸 微观组织形貌 Q355B钢 抗拉性能 |
| DOI：10.11951/j.issn.1005-0299.20240147 |
| 分类号:TG161 |
| 文献标识码:A |
| 基金项目:安徽省教育厅科学研究重点项目(2022AH051630). |
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| Study on the influence of local fire baking on the tensile properties of Q355B steel plate |
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CHENG Zhen1, YU Min2, GOU Ruibin1, JIA Shengkang1
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(1.College of Mechanical Engineering, Anhui Science and Technology University, Fengyang 233100, China;2. College of Architecture, Anhui Science and Technology University, Bengbu 233000, China)
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| Abstract: |
| To reveal the influence of local fire baking on the tensile properties of Q355B steel plates, the changes in the tensile properties of Q355B steel plates after exposure to fire are studied through fire heating treatment, tensile testing, microstructure and fracture analysis, combined with the measurement results of ferrite average grain size. The results show that the heat flux has a significant effect on the ferrite grain size of the steel plate. When the peak temperature is lower than 600 ℃, the endothermic power leads to the ferrite grain size of the steel plate to decrease. The endothermic power increases the strength of each plate, and the maximum increases in yield strength and tensile strength are 15.7% and 6.5% respectively compared with the base material. The tensile strength at the fire source is negatively correlated with the endothermic power, while the tensile strength outside the fire source is not significantly correlated. The yield strength of each plate decreases first and then stabilizes with the increase of the distance from the fire source point, but the variation of tensile strength of each plate is different. When the endothermic power is less than 0.27 J/min, the tensile strength is not sensitive to distance. And when it exceeds 0.27 J/min, the tensile strength is positively correlated with distance. The experimental results provide a reference for improving the mechanical properties of steel plates and reusing steel plates after fire. |
| Key words: local fire baking ferrite grain size microstructure Q355B steel tensile property |
