退火工艺对C-Mn-Si高强钢表面选择性氧化行为的影响

Effect of annealing process on surface selective oxidation behavior of C-Mn-Si high strength steels

研究了退火过程的露点温度对C-Si-Mn体系高强钢表面选择性氧化行为的影响规律。退火实验在带有露点控制器的热浸镀工艺模拟器上进行,采用扫描电镜和能谱仪表征退火后的样品表面特征,使用辉光放电光谱仪表征合金元素的深度分布。结果表明,随着硅含量从0.2 mass%增加到1.2 mass%,大量复合氧化物覆盖了样品外表面。随着退火过程露点温度从-50℃增加到-30℃,Mn元素倾向于向外表面富集。进一步将露点温度从-30℃提高到-10℃后,样品表面富集的Mn和Si反而减少。

The effect of dew point during annealing on selective oxidation behavior of C-Mn-Si high strength steels was studied. The experiments were carried out on a hot dip process simulator,in which the dew point during annealing could be controlled by a dew point controller named Dew Cal. External surface of the as-annealed steel samples was characterized by means of scanning electron microscopy（ SEM） and energy dispersive spectrometer（ EDS） analysis,and the alloying element profiles were detected by low discharge optical emission spectroscopy（ GDOES）. The results show that with the increasing of silicon content from 0. 2 mass% to 1. 2 mass%,a large amount of mixed oxides cover the external surface of the sample. With the dew point temperature increasing from-50 ℃ to-30 ℃ in the annealing process,the Mn element tends to be enriched on external surface,and when the dew point temperature increasing from-30 ℃ to-10 ℃,the concentration of Mn and Si on the surface of the sample decreases.