Influence of Electropulsing Pretreatment on Solid-State Graphitization of Spherical Graphite Iron

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 gr...

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Published inJournal of iron and steel research, international Vol. 19; no. 12; pp. 66 - 72
Main Authors LI, Qing-chun, LI, Ren-xing, LIN, Da-shuai, CHANG, Guo-wei, ZHAI, Qi-jie
Format Journal Article
LanguageEnglish
Published Singapore Elsevier Ltd 01.12.2012
Springer Singapore
Subjects
Applied and Technical Physics
Cementite
Decomposition
Engineering
Graphite
Graphitization
Heating
in-situ observation
Iron and steel industry
Machines
Manufacturing
Materials Engineering
Materials Science
Metallic Materials
Physical Chemistry
Pretreatment
Processes
pulse current
spherical graphite iron
Steels
共聚焦激光扫描显微镜
加热过程
固态
球形
球状石墨铸铁
石墨化过程
脉冲电流
预处理
spherical graphite iron
cementite
in-situ observation
graphitization
pulse current
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Summary: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.
Bibliography: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.
11-3678/TF
pulse current; spherical graphite iron; graphitization; cementite; in-situ observation
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ISSN:1006-706X
2210-3988
DOI:10.1016/S1006-706X(13)60034-5