连铸空心管坯内置行波磁场对凝固组织的影响

Effect of Inner-Traveling Magnetic Field on the Solidification Microstructure of Hollow Tubular Billet by Continuous Casting

摘要:

利用低熔点Sn-3．5％Pb合金进行了空心管坯内置行波磁场的静态模拟实验研究。结果表明：管坯内置行波磁场可以引起金属熔体内部纵截面上的大环流，减小了熔体凝固前沿的温度梯度，降低了金属熔体的冷却速率，抑制了熔体的枝晶生长，从而促进了晶粒的球化，改善了管坯的凝固组织。

Abstract:

Static simulation experiment is done for the Sn-3.5%Pb alloy of low-melting point to verify the effect of inner traveling magnetic field on the solidification microstructure of hollow tubular billet by continuous casting. The results show that the traveling magnetic field can provoke the circulation flow in the vertical section of molten metal, reduce the temperature gradient of solidification front and the cooling rate of molten metal, facilitate the transition from columnar to equiaxed structure, and refine the grains. So, the solidification microstructure of hollow tubular billet by continuous casting.was improved by the inner traveling magnetic field.