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作者多年来系统地研究了稀土在高碳当量铸铁中的行为,发现当加入微量稀土时,铸铁中的石墨仍为片状,但稀土加入量超过一个临界值以后,石墨开始从片状转变为蠕虫状和球状,在此同时铸铁的性能获得改善,在石墨变态前其抗拉强度σ_b可提高20％左右,在石墨变态后其抗拉强度σ_b可提高一倍以上。据此建立了“双峰值效应”曲线,并用以指导稀土灰口铸铁、蠕墨铸铁、球墨铸铁的生产,制造了耐压(水压)稀土灰口铸铁散热器等新产品,取得了巨大的经济效益。
The author systematically studied the behavior of rare earths in high carbon equivalent cast iron for many years and found that the graphite in the cast iron is still flaky when added with trace rare earths. However, when the rare earth addition exceeds a critical value, the graphite starts to change from flake to Worm-like and spherical, at the same time the performance of cast iron improved, its tensile strength before the graphite metamorphosis σ_b can be increased by about 20%, after the graphite metamorphosis its tensile strength σ_b can be more than doubled. Based on this, a “double-peak effect” curve was established and used to guide the production of rare earth gray cast iron, compacted graphite cast iron and ductile iron, and manufactured new products such as pressure-resistant (water pressure) rare earth gray cast iron radiators and obtained huge Economic benefits.