从生产率和成本方面考虑,柴油机气缸盖常用片状石墨铸铁制造,但存在抗拉强度不足的问题。通过添加Cr等合金元素,虽能提高抗拉强度,但会出现激冷增大的倾向。经试验表明,在复合添加Cr等合金元素的同时添加RE(稀土类元素),既能获得相当于蠕墨铸铁的抗拉强度,又能抑制激冷的发生,且也适合批量生产。 From the productivity and cost considerations, diesel engine cylinder head commonly used graphite flake, but there is the problem of insufficient tensile strength. By adding alloying elements such as Cr, the tensile strength can be increased, but chilling increases. The test shows that adding RE (rare earth element) together with alloying elements such as Cr can not only achieve the tensile strength equivalent to vermicular graphite iron, but also inhibit the occurrence of chilling, and also suitable for mass production.