摘要
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。
Transformation behavior of a cord steel C82DA was investigated and the kinetics model of pearlite transformation was established by means of dilatometry mierostrueture observation and hardness measurement. The results show that the critical transformation temperature of C82DA steel is AI = 732 ℃ , and Am = 759 ℃ , respectively. With increasing cooling rate, the ability of carbon diffusion decreases, the degree of undercooling increases, and the transformation start and finish temperature decrease, leading the increase of strength and hardness. Considering the mierostructure and hardness, the cooling rate of 20 ℃/s is recommended. The model of phase transformation temperature and cooling rate is proposed based on the experiments. The Avrami equation obtained is X = 1 - exp（ - kt1.824 ） , and k meets the function of Ink = -1.61121 x10-4T2 ＋0. 17083T-45.56905
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第2期220-224,共5页
Transactions of Materials and Heat Treatment
关键词
C82DA帘线钢
连续冷却
等温转变
相变模型
C82DA cord steel
continuous cooling
isothermal transformation
phase transformation mode｜
