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采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和万能拉力试验机,研究了Q235-A带钢氧化铁皮的组织、结构及其开裂行为.结果表明,氧化铁皮的成分主要为Fe3O4、Fe2O3和Fe,含有少量的Fe O,氧化层厚度比较均匀,约为10μm,结构致密且与基体结合较好.拉伸实验表明,随着应变的增加,裂纹条数增加呈先慢,后快,再慢的规律.应变达到0.05%时氧化铁皮开始出现裂纹,当应变在0.08%~0.10%范围内裂纹条数随应变增加非常明显,当应变超过0.10%时裂纹条数增加缓慢,应变超过0.15%时裂纹条数几乎不再增加.
The microstructure, structure and cracking behavior of Q235-A strip were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and universal tensile testing machine.The results show that the main components of the scale are Fe3O4, Fe2O3 and Fe, containing a small amount of FeO, the oxide layer thickness is relatively uniform, about 10μm, the structure is compact and bonded with the substrate better.Experimental results show that as the strain increases, the number of cracks increases first slow and then fast , And then slow law.When the strain reaches 0.05%, the scale begins to crack, and the crack number increases obviously with strain when the strain is between 0.08% and 0.10%. When the strain exceeds 0.10%, the crack number increases slowly and the strain exceeds The number of cracks at 0.15% almost never increases.