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为了判断建筑物失火后墙体内部冷轧钢筋能否继续满足使用要求,本文研究了高延性冷轧带肋钢筋的力学性能、组织及晶粒度与受热条件之间的关系,得出了以下结论:在500℃以下,该钢筋的抗拉强度、屈服强度及基体组织变化不大;在500~600℃之间,钢筋的力学性能及内部组织受温度影响特别显著,抗拉强度和屈服强度急剧下降,并出现了再结晶;当温度超过600℃后,抗拉强度、屈服强度基本趋于稳定,并出现了大量再结晶晶粒,形变织构基本消失。
In order to judge whether the cold-rolled steel bars in the wall can meet the requirement of use after the fire in building, this paper studies the relationship between mechanical properties, microstructure and grain size of the high ductility cold- CONCLUSION: The tensile strength, yield strength and matrix microstructure of the rebar have little change below 500 ℃. The mechanical properties and internal microstructure of the rebar are affected by temperature at 500-600 ℃. The tensile strength and yield strength Sharp decline, and the recrystallization occurred. When the temperature exceeded 600 ℃, the tensile strength and yield strength tended to be stable, and a large number of recrystallized grains appeared and the deformation texture basically disappeared.