学术论文

      脉冲电流对热处理过程中非金属相形态的影响

      Influence of pulse current on the shape of non-metal phases during heat treatment processes

      摘要:
      以铝硅合金和球墨铸铁为研究对象,分别采用正常热处理、室温及高温下施加脉冲电流处理的方法,研究了脉冲电流对固态金属中非金属相形态的影响.结果表明:在脉冲电流处理下,铝硅合金中粗杆状共晶硅的粒化速度加快;球墨铸铁经脉冲电流处理后,原有石墨的直径没有明显增大,石墨的平均似圆度略有增加,组织中出现了新生的球状小石墨;在脉冲电流作用下非金属相周围位错的行为及原子的扩散是决定非金属相形态的主要原因.
      Abstract:
      The effect of pulse current on the shape of non-metal phases in solid metals,such as Al-Si alloys and ductile cast irons,was studied by applying pulse current at room-temperature and high temperature and compared to normal heat processing.The results show that pulse current accelerates the granulation of coarse band-form eutectic silicon in the Al-Si alloy.The diameter of original graphite in the ductile cast iron treated by pulse current does not increase obviously,the average round-shaped degree of graphite increases a little,and some spherical graphite appears in the structure.The behavior of dislocations adjacent to non-metal phases and the diffusion of atoms by the action of pulse current are main reasons for the shape of non-metal phases.
      作者: 李青春 [1] 李仁兴 [2] 翟启杰 [2] 杨晓平 [3] 常国威 [3]
      作者单位: 辽宁工业大学材料科学与工程学院,锦州121001/上海市现代冶金与材料制备重点实验室,上海200072 上海市现代冶金与材料制备重点实验室,上海,200072 辽宁工业大学材料科学与工程学院,锦州,121001
      刊 名: 北京科技大学学报 ISTICEIPKU
      年,卷(期): 2011, 33(10)
      分类号: TG143.5
      机标分类号: TG1 TG2
      在线出版日期: 2012年4月21日
      基金项目: 辽宁省教育厅资助项目