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本文对稀土硅铁合金和硅钙合金混合处理,蠕虫状石墨铸铁(以下简称蠕铁)进行了研究。试验结果表明:混合处理合金加入量范围比单独用稀土硅铁合金处理宽约一倍;在含硫量不大于0.12%范围内都可用混合合金制取蠕铁,合金加入量随含硫量提高而增加;试验确定其合适的原铁水碳当量C_E=3.7—4.2%;随合金加入量的增加,石墨形态有一个从片状到蠕虫状的突变,即合金存在一个临界加入量;测得用混合合金处理的蠕铁σ_b=30—50公斤/毫米~2,δ=1.6—5.0%,HB=150—185;试验证明这种蠕铁具有良好的抗衰退性能和铸造性能,小的壁厚敏感性,适用于壁厚悬殊大、形状复杂的铸件。蠕铁钢锭模比灰铸铁使用寿命提高约一倍。
In this paper, rare earth ferrosilicon alloy and calcium-silicon alloy mixed treatment, worm-shaped graphite iron (hereinafter referred to as vermicular iron) were studied. The experimental results show that the range of mixed alloy dosage is about one times wider than that of the alloy treated with rare earth ferrosilicon alone and the mixed alloy can be used to produce vermicular iron in the range of sulfur content less than 0.12%. The alloy addition amount increases with the sulfur content Increase; the test to determine the appropriate carbon equivalent of molten iron C_E = 3.7-4.2%; with the increase in the amount of alloy, graphite morphology has a mutation from flake to worm-like, that there is a critical amount of alloy; measured by mixing The grain-treated iron compacts σ_b = 30-50 kg / mm 2, δ = 1.6-5.0%, HB = 150-185. It has been proved that the vermicular iron has good anti-decay performance and casting performance and small wall thickness sensitivity Sex, suitable for large wall thickness, the shape of complex castings. Vermicular iron ingot die ash cast iron life of about doubled.