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Cementite Decomposition in spherical graphite iron by Electropulsing

Journal of Materials Science & Technology 2009年第2期25卷 199-202页

作者： Qingchun Li Cuowei Chang Qijie Zhai Department of Materials and Chemical Engineering Liaoning University of Technology Jinzhou 121001 China Department of Materials Science and Engineering Shanghai University Shanghai 200072 China

The influence of electropulsing on cementite decomposition in the spherical graphite iron has been studied. The results indicated that the cementite was decomposed in a short time by high current density electropulsing. With increasing electropulsing time, the in situ nucleation of graphite in cementite was accompanied with the quick decomposition of cementite. The dislocation accumulation adjacent to the cementite and the quick diffusion of carbon atom by electropulsing were main reasons for the quick decomposition of cementite. The in situ nucleation of graphite in the cementite resulted from the dislocation climbing crossing the cementite lamellae.

关键词： Pulse electric current spherical graphite iron Cementite Decomposition

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Influence of Electropulsing Pretreatment on Solid-State Graphitization of spherical graphite iron

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Journal of iron and Steel Research International 2012年第12期19卷 66-72页

作者： LI Qing-chun LI Ren-xing LIN Da-shuai CHANG Guo-wei ZHAI Qi-jie School of Materials Science and Engineering Liaoning University of Technology Jinzhou 121000 Liaoning China Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai 200072 China

The solid-state graphitization process of spherical graphite iron after electropulsing pretreatment was ob- served in-situ by using a high-temperature confocal scanning laser microscope （HTCSLM）. The influence of electro- pulsing pretreatment on the decomposition of cementite and the formation of graphite during the solid-state graphiti- zation was studied. The result indicates that the electropulsing pretreatment can accelerate the decomposition of ce mentite, and make more neonatal graphite in small size be formed near the cementite. The neonatal graphite nucle ates and grows chiefly at the temperature range of 800 to 850 ℃, 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 pretreat- ment, the decomposition rate of cementite during the heating process is 0.16 and 0.24 μm2/s, respectively. Analy- sis shows that the electropulsing pretreatment promotes the dislocation accumulation near the cementite, conse- quently, the decomposition of cementite and the formation of neonatal graphite is accelerated during the solid-state graphitization.

关键词： pulse current spherical graphite iron graphitization cementite in-situ observation

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