论文部分内容阅读
南京地区所产土铁含磷约在0．5%左右,在铸造铸件时也同样发生发脆的情况,不过根据无锡柴油机厂的报导,含磷量即使低至0．3%以下时也发脆,我个人有些不成熟的看法,土铁的含磷量虽高,但含硅量却更不稳定,根据我厂化验的土铁来看,含硅量有的高达4—5%,生铁中含硅到3%时即达饱和,含硅再高则将溶解到纯铁体中而促使铸铁发脆,、我厂会有这样的经验:在54年生产球墨铸铁铸件时,由于原材料混淆和配料错误,含硅超过3%,铸件经热处理后从一公尺高的地方掉下来就跌碎了,最先还以为是球化和热处理上的问题,但从金相上并不易发现,最后从
In Nanjing area, the iron content of soil iron is about 0.5%. In the casting of castings, the same situation of brittleness occurs. However, according to the report of Wuxi Diesel Engine Factory, even if the phosphorus content is as low as 0.3% Brittle, I personally have some premature views, soil iron phosphorus content is high, but the silicon content is more unstable, according to my factory soil test iron, silicon content of up to 4-5%, pig iron Silicon in the 3% to reach full saturation, high silicon will dissolve into pure iron body to promote the cast iron brittle, I plant will have such experience: in the 54-year production of ductile iron castings, due to confusion of raw materials And ingredients wrong, more than 3% of silicon, castings after heat treatment fell from one meter high to fall, the first thought is the problem of ball and heat treatment, but the metallographic is not easy to find, Last from