Dynamic continuous cooling transformation curves and mechanical properties of S355 low alloy structural steel
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采用Gleeble-3800热模拟试验机测定了 S355低合金结构钢的动态CCT曲线,并通过室温拉伸试验、低温冲击试验、显微组织观察等手段,研究了不同轧制温度与冷却方式对S355结构钢的组织与力学性能的影响.结果表明,当冷却速度＜10 ℃/s时,S355结构钢相变产物为铁素体、珠光体与贝氏体.冷却速度在10～15℃/s范围时,S355钢相变产物为铁素体、贝氏体.轧制后采用水冷冷却的S355钢的强度和屈强较高,低温冲击性能较低.采用空冷冷却的S355结构钢强度和屈强比较低,低温冲击性能较高.轧制温度840 ℃,空冷轧制的S355钢综合力学性能可满足BS EN 10225-2009的要求.
Dynamic CCT curves of S355 low alloy structural steel was measured by Gleeble-3800 thermal simulation tester,and the effects of different rolling temperatures and cooling methods on the microstructure and mechanical properties of the S355 steel were studied by means of room temperature tensile test,low temperature impact test and microstructure observation.The results show that when the cooling rate is less than 10 ℃/s,the phase transformation products of the S355 steel are ferrite,pearlite and bainite.When the cooling rate is in the range of 10-15 ℃/s,the phase transformation products are ferrite and bainite.After rolling with water cooling,the steel has high strength and higher yield ratio,but has lower low-temperature impact property.After rolling with air cooling,the steel has lower strength and yield ratio,and higher low-temperature impact property.When the rolling temperature is 840 ℃,the comprehensive mechanical properties of the S355 steel rolled with air cooling can meet the requirements of BS EN 10225-2009 standard.
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