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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。
To study the microstructure and properties of high-strength dual phase steel under different cooling rates. First determine the critical cooling rate of the sample, and then the sample was heated to 800 ℃, after cooling were 10, 20, 30 and 40 ℃ / s cooling rate to 350 ℃, the microstructure of the samples observed in various stages, Test machine to test the mechanical properties of the specimen at different cooling rates. The results show that when the cooling rate is 10 ℃ / s, the volume fraction of soft matrix is large and the tensile strength and yield strength are both low. As the cooling rate increased to 20, 30 and 40 ℃ / s, the tensile strength and yield strength gradually increased, but the range of change was not large.