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据最新报道,采用真空减压处理工艺可获得2 mm厚的无白口组织的球铁断面。本文介绍了一种缩短减压处理时间的方法。研究表明:在铁水中添加CaC_2,可将真空保温时间减少至5 min以内,熔融金属中的总氧量、溶解氧量及含硫量也快速降低。添加1%的CaC_2,可获得2 mm厚的最佳石墨球数试样,该试样没有白口。当添加2%CaC_2时,该2 mm厚的试样中即可观察到白口组织。研究结果表明:CaC_2的添加量应当适中。
According to the latest report, using vacuum decompression process can be obtained 2 mm thick non-white mouth of the ductile iron cross-section. This article describes a way to reduce the time required for depressurization. The results show that the addition of CaC_2 to molten iron can reduce the vacuum holding time to less than 5 min, and the total oxygen, dissolved oxygen and sulfur in the molten metal also decrease rapidly. Adding 1% CaC_2, the best graphite ball specimen with a thickness of 2 mm can be obtained. When 2% CaC 2 was added, white tissue was observed in the 2 mm thick specimen. The results show that: CaC_2 should be added moderately.