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采用热重分析仪和Gleeble-3500热模拟试验机研究了Si、Cr、Ni和Cu微合金元素对超低碳钢氧化行为和氧化层的影响。结果表明,在氧化过程中合金元素在氧化层与基体的界面处发生富集,其中Si和Cr形成了一层连续的富集层,Cu和Ni以粒子形式在界面处析出。微合金元素的富集一方面抑制了铁原子由基体向外扩散,从而显著提高钢的抗氧化性,其中Si和Ni的效果最好,Cr次之,Cu的效果最差;另一方面提高了氧化层与基体的结合力,抑制了氧化层的鼓泡现象,Si的抑制效果最好,Cu次之,Cr和Ni的抑制效果最差。
The effects of Si, Cr, Ni and Cu microalloying elements on the oxidation behavior and the oxide layer of ultra-low carbon steel were investigated by TG and Gleeble-3500 thermal simulator. The results show that alloying elements are enriched at the interface between the oxide layer and the matrix during the oxidation process. Si and Cr form a continuous enrichment layer, and Cu and Ni precipitate as particles at the interface. On the one hand, enrichment of microalloying elements inhibits the outward diffusion of iron atoms from the matrix, thereby significantly improving the oxidation resistance of the steel, of which Si and Ni are the best, followed by Cr and Cu are the worst; on the other hand, The binding force between the oxide layer and the substrate inhibits the bubbling of the oxide layer, and the inhibition effect of Si is the best, followed by Cu, and the inhibition effect of Cr and Ni is the worst.