IF钢合金化镀层相结构及60° V弯粉化性能研究

基于工业化生产的连续热镀锌产线，以无间隙原子钢（IF钢）合金化镀层板为研究对象，采用扫描电镜（SEM）、X射线衍射仪（XRD）、电感耦合等离子光谱仪（ICP）及60° V弯设备，研究了合金化温度对IF钢合金化镀层相结构、镀层Fe含量以及镀层抗粉化性能的影响规律。结果表明:在合金化温度为485~545 ℃时，随着温度的增加，镀层中η、ζ相依次消失，δ、Γ相含量逐渐增加，镀层Fe的质量分数由7%增加到12%，粉化宽度由2.45 mm增加到4.23 mm；在合金化温度为515~530 ℃时，镀层相结构主要为δ相，Fe含量约为10%，粉化宽度＜4 mm，镀层具有良好的综合性能。因此，可通过控制合金化温度来控制IF钢合金化镀层的相结构并获得相应的抗粉化对策，为大批量生产提供技术支撑。

Study on Phase Structure and 60° V Bending Powder Properties of Galvannealed IF Steel

Based on a continuous hot-dip galvanizing production line of industrial production, the influence of alloying temperature on the phase structure, Fe content and plating resistance to chalking of IF steel galvannealed coating was studied by using scanning electron microscopy (SEM), X-ray diffraction (XRD), inductively coupled plasma spectrometer (ICP) and 60° V bending equipment. The results show that when the alloying temperature ranges from 485 to 545 ℃, with the increase of temperature, the η and ζ phases in the plating disappear in sequence, and the δ and Γ phase contents increases gradually. Moreover, the mass fraction of Fe in the coating increases from 7% to 12%, and the powder width grows from 2.45 mm to 4.23 mm. When the alloying temperature is in the range of 515 ℃ to 530 ℃, the coating phase structure is mainly δ phase, Fe content in the coating is about 10%, and the powder width is less than 4 mm. The coating has an excellent comprehensive performance. The results reveal that the plating resistance to chalking of the galvannealed coating of IF steel strips can be achieved by controlling the alloying temperature, which provids technical support for mass production.