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文内论述了用包头1~#稀土合金对钒钛铸铁进行变质处理,当石墨由片状变为蠕虫状后,其抗拉强度由15～20公斤/毫米~2提高为40～50公斤/毫米~2。碳当量对蠕虫状石墨铸铁的强度没有显著影响。锰的含量由0.28～0.35％增至0.6～0.84％,其抗拉强度平均可提高5％,珠光体也有较显著的增加。加入0.08％的锡以后,珠光体含量由原来的20～35％提高至85％以上,其抗拉强度提高13.65％。用电子扫描显微镜对钒、钛化合物,锡、锰的分布,以及各种组织中硅、锰的含量进行了微区定量分析。铸态时的抗拉强度平均为48公斤/毫米~2,经正火处理后平均为59公斤/毫米~2,比铸态时提高21.5％,经等温淬火处理后,其抗拉强度平均为93公斤/毫米~2,比铸态时提高92.6％,退火处理后抗拉强度平均为40公斤/毫米~2,延伸率由1.54％提高至3.47％,退火后的硬度由铸态时的HB180～210降至HB140～160。一般钒钛铸铁经等温淬火处理后,其抗拉强度约可提高2.5倍。
In this paper, the modification of vanadium-titanium cast iron with Baotou 1 ~ # rare-earth alloy is described. When the graphite changes from flake to worm-like, the tensile strength increases from 15 ~ 20kg / mm ~ 2 to 40 ~ 50kg / Mm ~ 2. Carbon equivalent has no significant effect on the strength of worm-like graphite cast iron. The content of manganese increased from 0.28 ~ 0.35% to 0.6 ~ 0.84%, the tensile strength increased by 5% on average and the pearlite also increased significantly. After adding 0.08% tin, pearlite content increased from 20% -35% to 85%, and its tensile strength increased by 13.65%. The distribution of vanadium, titanium compounds, tin, manganese and the contents of silicon and manganese in various tissues were analyzed by scanning electron microscopy. The average tensile strength of as-cast was 48 kg / mm ~ 2, averaged 59 kg / mm ~ 2 after normalizing treatment and 21.5% higher than that of as-cast. After being isothermal quenched, the tensile strength averaged 93 kg / mm ~ 2, 92.6% higher than the as-cast state, the average tensile strength after annealing was 40 kg / mm ~ 2, and the elongation increased from 1.54% to 3.47%. The hardness after annealing was improved from as-cast HB180 ~ 210 dropped to HB140 ~ 160. General vanadium titanium cast iron isothermal quenching, its tensile strength can be increased by about 2.5 times.