冷却速率对E36船用钢板力学性能的影响

对不同冷却速率下控轧控冷态E36船用钢板的组织性能进行了研究。结果表明：在10～60 ℃/s范围内，随着冷却速率的增加，钢板屈服强度和抗拉强度呈上升趋势；但当冷却速率在19.3 ℃/s时，出现了韧性恶化，然后随着冷却速率的增加，－60 ℃的冲击功升高，且钢板的伸长率并无明显恶化；冷却速率超过40 ℃/s时, 随冷却速率的增加，钢板强度增加不明显。在冷却速率为56.3 ℃/s时，钢板组织为粒状贝氏体+针状铁素体，晶粒细小，钢板综合力学性能最佳。

Influence of cooling rate on properties of E36 grade ship plate steel

At different cooling rate, the research of microstructure and properties of E36 grade ship plate at TMCP state show that during the 10~60 ℃/s cooling rate range, as the cooling rate increases, the comprehensive mechanical proper- ties of E36 ship plate are significantly improved, but at the cooling rate of 19.3 ℃/s , toughness deteriorates. The yield strength and tensile strength is rising ,but when the cooling rate beyond 40 ℃/s, the strengthen effect of cooling rate weak- ens. The impact energy of - 60℃ increases as the cooling rate increases, and no significant elongation steel plates deterio- rate. By comparison of different cooling rate, at 56.3 ℃/s E36 ship plates have fine grain size which is consist of granular bainite and acicular ferrite, and the best comprehensive mechanical properties are obtained.