Tensile cracking behavior of oxide scale in hot-rolled steel
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摘要: 采用X射線衍射儀(XRD)、掃描電子顯微鏡(SEM)和萬能拉力試驗機,研究了Q235-A帶鋼氧化鐵皮的組織、結構及其開裂行為.結果表明,氧化鐵皮的成分主要為Fe3O4、Fe2O3和Fe,含有少量的FeO,氧化層厚度比較均勻,約為10 μm,結構致密且與基體結合較好.拉伸實驗表明,隨著應變的增加,裂紋條數增加呈先慢,后快,再慢的規律.應變達到0.05%時氧化鐵皮開始出現裂紋,當應變在0.08%~0.10%范圍內裂紋條數隨應變增加非常明顯,當應變超過0.10%時裂紋條數增加緩慢,應變超過0.15%時裂紋條數幾乎不再增加.Abstract: The microstructure, structure, and cracking behavior of Q235-A strip iron oxide skin were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and a universal tensile testing machine. The results show that the composition of the iron oxide mainly consists of Fe3O4, Fe2O3, and Fe, together with small amount of FeO, the oxide layer has the same thickness all over, about 10 μm, the structure is dense, and the matrix is better connected. The tensile experiments show that with increasing strain, the increase in the number of cracks is at first slow, then fast, then slow again. When the strain reaches 0.05%, its iron oxide skin begins to crack; the number of cracks increases with increasing strain in the range 0.08% -0.10%. When the strain exceeds 0.10%, the crack number increases slowly, and when the strain exceeds 0.15%, the number of cracks stops grow.
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Key words:
- hot-rolled steel /
- oxide scale /
- cracks /
- tensile cracking
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參考文獻
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