磁场热处理对FeCrCo合金组织性能的影响

Microstructure and Performance of FeCrCo Alloys Fabricated by Heat Treatment under Magnetic Field

研究了Fe-25Cr-12Co合金在不同拉速下对定向凝固组织以及磁场施加对合金热处理组织及磁性能的影响。用金相显微镜和TEM对合金的显微组织和结构进行分析,用型振动样品磁强计对合金进行磁性能测试。结果表明,提高拉速有利于减少合金中σ析出相但不利于合金的取向生长。磁场热处理有利于促进α1粒子由颗粒转变为长形状,并且改变合金磁性能,合金在平行于磁场方向的磁性能好于无磁场条件,而合金垂直于磁场方向的磁性能低于无磁场条件。

Fe-25Cr-12Co alloys were fabricated by directional solidification combined with heat treatment under magnetic field. The influence of drawing speed and magnetic field on the microstructure and magnetic performance of the alloys was investigated. The microstructure was characterized by Metallurgical Microscopy and Transmission Electron Microscopy（TEM）. The magnetic properties were also tested by a magnetometer. The results show that the increment of drawing speed of directional solidification can decrease the precipitation of σ phase, but it is harmful to the directional regular arrangement of microstructure. Annealing treatment under magnetic field promotes the formation of long-rod-shaped α1 particles, and changes the remanence and coercivity of alloys. The alloy parallel to the magnetic field shows better magnetic performance than that under 0T magnetic field; however, the alloy perpendicular to magnetic field exhibits worse magnetic performance than that under 0T magnetic field.