Abstract
The solid-state graphitization process of spherical graphite iron after electropulsing pretreatment was observed in-situ by using a high-temperature confocal scanning laser microscope (HTCSLM). The influence of electropulsing pretreatment on the decomposition of cementite and the formation of graphite during the solid-state graphitization was studied. The result indicates that the electropulsing pretreatment can accelerate the decomposition of cementite, and make more neonatal graphite in small size be formed near the cementite. The neonatal graphite nucleates and grows chiefly at the temperature range of 800 to 850 °C, and the average growth rate of neonatal graphite is 0.034 μm2/s during the heating process. For the spherical graphite iron after normal and electropulsing pretreatment, the decomposition rate of cementite during the heating process is 0.16 and 0.24 μm2/s, respectively. Analysis shows that the electropulsing pretreatment promotes the dislocation accumulation near the cementite, consequently, the decomposition of cementite and the formation of neonatal graphite is accelerated during the solid-state graphitization.
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References
Li Qingchun, Li Renxing Li, Yue Xudong, et al. Effect of Electropulsing on the Formation of Graphite During Solid State Graphitization of Spherical Graphite Iron [J]. Materials Chemistry and Physics, 2008, 112: 402.
Li Qingchun, Li Renxing, Chang Guowei, et al. Research of Microstructure of Spherical Graphite Iron by Electropulsing Annealing [J]. Journal of Materials Processing Technology, 2009, 209: 2015.
Li Qingchun, Chang Guowei, Zhai Qijie. Cementite Decomposition in Spherical Graphite Iron by Electropulsing [J]. Journal of Materials Science and Technology, 2009, 25: 199.
WU Cun-you, LI Ting-ju, WEN Bin, et al. Influence of High Magnetic Field Annealing on Structure of Spheroidal Graphite Cast Iron [J]. Journal of Dalian University of Technology, 2004, 44: 514 (in Chinese).
Dominic Phelan, Mark Reid, Rian Dippenaar. Kinetics of the Peritectic Phase Transformation: In-Situ Measurements and Phase Field Modeling [J]. Metallurgical and Materials Transactions, 2006, 37A: 985.
Liang G F, Wan C Q, Wu J C, et al. In Situ Observation of Growth Behavior and Morphology of Delta-Ferrite as Function of Solidification Rate in an AISI304 Stainless Steel [J]. Acta Metallurgica Sinica, 2006, 19(6): 441.
LIU Zong-chang, REN Hui-ping, SONG Yi-quan. The Solid State Phase Transformation of Metal [M]. Beijing: Metallurgy Industry Press, 2003 (in Chinese).
Zhou Yizhou, Zhang Wei, Wang Baoquan, et al. Grain Refinement and Formation of Ultrafine Grained Microstructure in a Low-Carbon Steel Under Electropulsing [J]. Journal of Materials Research, 2002, 17: 2105.
Zhou Yizhou, Zhang Wei, Sui Manling, et al. Formation of a Nanostructure in a Low-Carbon Steel Under High Current Density Electropulsing [J]. Journal of Materials Research, 2002, 17: 921.
Zhou Yizhou, Guo Jingdong, Zhang Wei, et al. Influence of Electropulsing on Nucleation During Phase Transformation [J]. Journal of Materials Research, 2002, 17: 3012.
Conrad H, Sprecher A F. Dislocations in Solids [M]. Amsterdam, The Netherlands, 1989.
QIN Rong-shan. Investigations on the Nonequilibrium Transformation by Pulse Electric Current [D]. Shenyang: Institute of Metal Research, Chinese Academy of Science, 1996 (in Chinese).
Xiao Suhong, Zhou Yizhou, Guo Jingdong, et al. The Effect of High Current Pulsing on Persistent Slip Bands in Fatigued Copper Single Crystals [J]. Materials Science and Engineering, 2002, 332 A: 351.
Languillaume J, Kapelski G, Baudelet B. Cementite Dissolution in Heavily Cold Drawn Pearlitic Steel Wires [J]. Acta Materialia, 1997, 45: 1201.
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Li, Qc., Li, Rx., Lin, Ds. et al. Influence of Electropulsing Pretreatment on Solid-State Graphitization of Spherical Graphite Iron. J. Iron Steel Res. Int. 19, 66–72 (2012). https://doi.org/10.1016/S1006-706X(13)60034-5
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DOI: https://doi.org/10.1016/S1006-706X(13)60034-5