材料科学
延展性(地球科学)
微观结构
极限抗拉强度
阶段(地层学)
复合材料
高强度钢
冶金
作者
Mengjie Wang,Guobiao Lou,Guoqiang Li,Binhui Jiang
标识
DOI:10.1016/j.firesaf.2022.103639
摘要
Previous studies on the mechanical properties of high strength steel (HSS) Q690 at fire were mainly focused on the heating stage and post-fire stage, while few studies have been conducted on those at the cooling stage of fire. In this paper, mechanical properties of Q690D steel at the cooling stage were experimentally studied and were compared with those at the heating stage. The results show that the differences in mechanical properties of Q690D steel between the cooling and heating stages are relatively small when the ultimate heating temperature ( T u ) is within 400 °C, while the differences enlarge as T u further increases, especially after T u exceeds 800 °C. Moreover, the effects of both the cooling rate and holding duration at T u on the ultimate strength of Q690D steel at the cooling stage are negligible, while these effects on Young's modulus, yield strength and ductility are not negligible and related to T u . It is noted that different heating and cooling processes have an effect on the microstructure of the steel, especially after T u exceeds 800 °C, which would influence the mechanical properties of the steel.
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