电磁离心耐热管坯的实验研究

研究了电磁离心复合力场作用下获得的1Cr25Ni20Si2耐热管坯的凝固组织与力学性能·实验结果表明,在离心铸造过程中施加合适强度的稳恒磁场,1Cr25Ni20Si2耐热管坯的凝固组织得到明显改善,结果其冲击韧性和延伸率也相应地提高·但当磁感应强度B>0 04T后,再进一步加大磁感应强度,1Cr25Ni20Si2耐热管坯的力学性能又出现下降的趋势·通过分析得出,稳恒磁场与旋转熔体相互作用,产生电磁搅拌是耐热管凝固组织和力学性能改善的根本原因·

Experimental Study on Heat-Resisting Tube Blank by Electromagnetic Centrifugal Casting

The solidification structure and mechanical properties of 1Cr25Ni20Si2 tube blank were investigated, which was acquired through the joint fields of electromagnetic and centrifugal force. The results show that if a steady magnetic field of appropriate magnetic induction is applied in centrifugal casting process, the solidification structure of the blank can be improved markedly with its impact toughness and elongation improved correspondingly. But the mechanical properties of the blank will drop if increasing the magnetic induction further after it reaches >0.04 T. By analysis, it was concluded that electromagnetic stirring, induced due to interaction between steady magnetic field and rotating metal melt, is radical reason that solidification structure and mechanical properties of heat-resistant tube blank are improved.