提高低碳钢磁性能的球化退火工艺试验

为提高低碳钢磁性能,对其进行了不同方式的退火处理。结果表明,用700 ℃球化退火代替920 ℃常规完全退火,获得了与常规退火工艺相同的磁性能,而工艺时长只有常规退火的一半。观察球化退火显微组织发现,渗碳体形貌的改变对磁性能有很大影响,片状的渗碳体在球化退火中发生了断裂和球化,对磁路的阻碍作用下降从而提高了低碳钢的磁性能,其中三次渗碳体球化的影响可能比共析渗碳体更大。

Spherical annealing process for improving magnetic properties of low-carbon steel

Different annealing processes for improving the magnetic of low carbon steel was carried out. The results show that when the conventional complete annealing at 920 ℃ is replaced by spheroidizing annealing at 700 ℃, the magnetic properties are the same as those of the conventional annealing process, but the process time is only half of that of the conventional annealing. It is found that the morphology of cementite has a great influence on the magnetic properties. The lamellar cementite are broken and spheroidized during the spheroidizing annealing, which reduces the blocking effect on the magnetic circuit and improves the magnetic properties of the low carbon steel. The influence of spheroidization of tertiary cementite may be greater than that of eutectoid cementite.