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| 脉冲电流对球墨铸铁退火组织与性能的影响 | |
| 引用本文： | 李青春,陈湘茹,常国威,翟启杰.脉冲电流对球墨铸铁退火组织与性能的影响[J].北京科技大学学报,2008,30(8). |
| 作者姓名： | 李青春 陈湘茹 常国威 翟启杰 |
| 作者单位： | 1. 上海大学材料科学与工程学院,上海,200072;辽宁工业大学材料与化学工程学院,锦州,121001 2. 辽宁工业大学材料与化学工程学院,锦州,121001 3. 上海大学材料科学与工程学院,上海,200072 |
| 摘 要： | 在球墨铸铁的高温石墨化过程中采用脉冲电流为辅助手段,研究了脉冲电流对退火处理球墨铸铁力学性能以及渗碳体的石墨化、铁素体转变的影响.经脉冲电流处理后,球墨铸铁的硬度、抗拉强度降低,延伸率增加.SEM分析表明,脉冲电流加速了球墨铸铁的高温石墨化过程,促进了铁素体的转变.脉冲电流处理后石墨形核率的增加是加速渗碳体分解和铁素体转变的主要原因. |
| 关 键 词： | 球墨铸铁 脉冲电流 渗碳体 铁素体 石墨化 |
Effect of pulse current on the annealing structure and property of spherical graphite iron |
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| LI Qingchun,CHEN Xiangru,CHANG Guowei,ZHAI Qijie.Effect of pulse current on the annealing structure and property of spherical graphite iron[J].Journal of University of Science and Technology Beijing,2008,30(8). | |
| Authors: | LI Qingchun CHEN Xiangru CHANG Guowei ZHAI Qijie |
| Abstract: | The effects of pulse current on the mechanical properties of spherical graphite iron,the graphitization of cementite and the transformation of ferrite were studied during the high-temperature graphitization of spherical graphite iron with pulse electric current as an assistant way.The results show that the tensile strength and the hardness of the specimen decrease,while the elongation increase.SEM micrographs of the specimen show that electropulsing promotes greatly the high-temperature graphitization of spherical graphite iron and the transformation of ferrite.The acceleration of cementite decomposition and the transformation of ferrite result from the increase of graphite nucleation rate by electropulsing. |
| Keywords: | spherical graphite iron pulse current cementite ferrite graphitization |
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