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为了研究C82DA帘线钢相变规律,建立动力学模型,采用热膨胀仪、OM和硬度仪测试了试样的膨胀量、显微组织和显微硬度。结果表明,C82DA钢的临界转变温度A c1=732℃,A ccm=759℃。随冷却速度增加,碳扩散能力降低,过冷度增大,相变开始温度和结束温度逐渐降低,组织强度增加,硬度升高。综合组织和硬度,适宜冷却速度为20℃/s。回归了相变温度与冷速的关系模型,另外,确定了Avrami方程为X=1-exp(-kt1.8214),其中k满足lnk=-1.61121×10-4T2+0.17083T-45.56905。
In order to study the phase transformation law of C82DA cord steel, a dynamic model was established. The dilatancy, microstructure and microhardness of the sample were tested by means of dilatometer, OM and hardness tester. The results show that the critical transition temperature of C82DA steel is A c1 = 732 ℃ and A ccm = 759 ℃. As the cooling rate increases, the carbon diffusion ability decreases, the degree of undercooling increases, the onset temperature and the end temperature of the phase transition decrease, and the strength of the structure increases and the hardness increases. Comprehensive organization and hardness, suitable cooling rate of 20 ℃ / s. In addition, the Avrami equation is determined as X = 1-exp (-kt1.8214), where k satisfies lnk = -1.61121 × 10-4T2 + 0.17083T-45.56905.