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Fe_3Al基合金成本低廉、密度较低、抗氧化及抗硫蚀性优异,是最接近应用的结构材料之一。“九五”期间的研究,通过合金化及B2热机械处理,室温塑性得到明显改善,达10％～15％以上。 本工作在解决Fe_3Al基金属间化合物合金大体积材料的熔炼、锻造、热轧工艺问题,获得180～200mm宽薄板的基础上,研究了Fe-28Al-5Cr与Fe-28Al-5Cr-0.5Nb-0.1C合金的高温变形行为,发现在850℃左右,应变速率为8.33×10~(-4)s~(-1)时,呈现出大晶粒的超塑性变形行为,延伸率分别达到145％和254％。这意味着不需要获得细晶的特别工艺处理就可以直接进行超塑
Fe_3Al-based alloy low cost, low density, excellent oxidation resistance and corrosion resistance, is the closest application of structural materials. During the Ninth Five-year Plan period, the plasticity at room temperature was significantly improved by alloying and B2 thermal mechanical treatment, reaching 10% to 15%. Fe-28Al-5Cr-0.5Nb-Fe-28Al-5Cr-0.5Nb-Fe-28Al-5Cr alloy has been studied in this work on the basis of solving the problem of smelting, forging and hot rolling of large volume materials of Fe 3 Al-based intermetallic compounds, 0.1C alloy. It was found that the superplastic deformation behavior of large grains at the temperature of 850 ℃ and the strain rate of 8.33 × 10 ~ (-4) s ~ (-1), the elongation rates reached 145% And 254%. This means that superplastics can be directly processed without the need for special processing of fine crystals