不同冷却速度下建筑双相钢组织及性能变化  

Microstructure and Properties of Dual Phase Steel Under Different Cooling Rates

作　　者：刘松[1] 秦文福 

机构地区：[1]重庆电子工程职业学院机电学院,重庆401331 [2]重庆银河铸锻有限责任公司技术部,重庆400055

出　　处：《铸造技术》2017年第2期301-303,共3页Foundry Technology

基　　金：重庆市教委科研资助项目(09SKS04)

摘　　要：研究高强度建筑双相钢在不同冷却速度下的组织及性能变化。首先确定试样的临界冷却速度,然后将试样升温至800℃,保温后分别以10、20、30和40℃/s的速度冷却至350℃,观察各阶段试样金相组织,在万能试验机上测试不同冷却速度下试样的力学性能。结果表明,冷却速度为10℃/s时,双相钢中软基体体积分数大,抗拉强度和屈服强度都较低。随着冷却速度增大至20、30和40℃/s时,抗拉强度和屈服强度逐渐增大,但是变化范围不大。The changes of microstructure and properties of high strength dual phase steel under different cooling rates were studied. The critical cooling rate of the sample was determined. The sample was heated to 800 ℃, and then coolled to 350℃ at different cooling speeds. The microstructure and properties of the steel were studied by metallographic and the universal testing machine. The results show that, when the cooling speed is 10 ℃/s, the volume fraction of soft matrix in the dual phase steel is high, while the tensile strength and yield strength are low. The tensile strength and yield strength increase gradually with the increase of the cooling rate.

关 键 词：冷却速度 高强建筑双相钢 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]