旋转电磁场对BFe10-1-1合金管坯组织及力学性能的影响

研究旋转电磁场对水平连铸空心BFe10-1-1合金管坯凝固组织和力学性能的影响,并对其机理进行初步的探讨。结果表明：在工频旋转电磁场的搅拌作用下,BFe10-1-1合金管坯的凝固组织显著细化,由粗大的柱状晶完全转化为均匀细小的等轴晶,同时抑制了Ni元素的枝晶偏析;施加电磁场后管坯的力学性能得到明显改善,当励磁电流为80 A时,管坯抗拉强度提高了15.3%,屈服强度提高了10.9%,伸长率提高了58.6%。

Effect of rotating electromagnetic field on solidification structures and mechanical properties of tube billets of BFe10-1-1 alloy

The effects of rotating electromagnetic field on the solidification structure and mechanical properties of horizontal continuously cast tube billets of BFe10-1-1 alloy were investigated and theoretically interpreted. The results indicate that the conventional coarse columnar grains change to fine equiaxed ones with the application of commercial frequency electromagnetic field during horizontal continuous casting. Meanwhile, the segregation of Ni element is suppressed and distributes more uniformly over the cross section. After the electromagnetic treatment, the tensile strength of the billets are all improved, and when the input current is 80 A, the increase of tensile strength, elongation and hardness are 15.3%, 10.9% and 58.6%, respectively.