Abstract
In order to design a new kind of low-cost oxidation-resistant high-temperature alloy with good weldability which might be used as structure material of iron-ore sintering furnaces and magnesium-smelting tanks, the complex effects of carbon and silicon on the structure and properties of the Fe-27Cr-15Ni-N alloy are investigated simultaneously by the orthogonal experiment. It has been shown that as the carbon content increases, the alloy rupture at 1250 °C increases at first until carbon content reaches about 0.45 %, and then decreases notably. Meanwhile its oxidation resistance degrades apparently. As the silicon content increases, the alloy rupture strength at 1250 °C decreases acutely, while its oxidation resistance improves at first and then deteriorates remarkably. At 1250 °C, the grain-boundary (GB) is vital to the alloy rupture strength, the variation of carbon content in the alloy affects the GB structure obviously so as to influence the alloy strength. However, the solubility of carbon in solid and its activity are strongly dependent on the silicon addition to the alloy. The suitable carbon content to the alloy ranges from 0.30 to 0.40 %, and the silicon content from 2.00 to 3.00 %.
Published Version
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