Qingdao Iron and Steel Company Second Wire Factory

Qingdao, China

Qingdao Iron and Steel Company Second Wire Factory

Qingdao, China

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Liu L.-Z.,University of Science and Technology Beijing | Yu W.-H.,University of Science and Technology Beijing | Liu X.-P.,University of Science and Technology Beijing | Sun L.,Qingdao Iron and Steel Company Second Wire Factory | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2014

Transformation behavior of a cord steel C82DA was investigated and the kinetics model of pearlite transformation was established by means of dilatometry microstructure observation and hardness measurement. The results show that the critical transformation temperature of C82DA steel is Ac1=732°C, and Accm=759°C, 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 microstructure and hardness, the cooling rate of 20°C/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(-kt1.8214), and k meets the function of lnk =-1.61121×10-4T2+0.17083T-45.56905.


Yu W.-H.,University of Science and Technology Beijing | Liu F.,University of Science and Technology Beijing | Gao S.,University of Science and Technology Beijing | Liu L.-Z.,University of Science and Technology Beijing | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2014

Continuous cooling transformation (CCT) curves of C92DA steel were measured by the aid of quenching thermal dilatometer. The microstructure and microhardness of the tested steel after heat treatment were observed, the pearlite lamellar spacing of the sample under part of the cooling rate was measured by scanning electron microscope (SEM). Lamellar spacing and supercooling degree linear relationship model was regressed. Finally, the relationship model between phase transformation temperature and cooling rate of the steel were established. The results show that the model has high fitting degree. ©, 2014, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


Yu W.-H.,University of Science and Technology Beijing | Gao S.,University of Science and Technology Beijing | Liu F.,University of Science and Technology Beijing | Liu L.-Z.,University of Science and Technology Beijing | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2014

Based on the chemical composition checking of 80 degree cord steel C82DA and 90 degree steel C92DA, effect of the alloy difference on phase transformation process of the alloys was studied. The phase transition including phase transition point, microstructure and pearlite lamellar spacing in the same condition of heat treatment was studied by means of optical microscopy, scanning electron microscopy (SEM) and dilatometer. Phase transformation kinetics equations were obtained by isothermal test. The parameter n and k values in different isothermal temperatures were compared. The results show that C, Si, Cr content in the C92DA steel is higher than that in the C82DA steel, thus the pearlite lamellar spacing of C92DA steel is refined compared with that of C82DA steel. The n values in C92DA steel is higher than that of C82DA steel, which can provide basic data for determining real production process and constructing online quality prediction model. ©, 2014, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.

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