为了研究用来制造曲轴和凸轮轴的球墨铸铁的淬透性,作者用金相、X—射线、膨胀仪、端面淬火等方法研究了一般球墨铸铁和低合金球墨铸铁(Cu0.2～0.3％、Ni0.15～0.3％、V0.15～0.28％、Mo0.15～0.3％)的淬透性。研究是在φ25mm长100mm的园柱形试样上进行的,试样由φ35mm,长400mm的铸棒加工而成。铁水在МГП—52型实验室感应电炉中熔炼,并于1440～1460℃下在浇包中用镁、氧化镁变质处理。为了避免铸件白口, In order to study the hardenability of nodular cast iron used to manufacture crankshafts and camshafts, the authors studied the effects of general ductile iron and low-alloy ductile iron (Cu 0.2-0.3%) on the microstructure, X-ray, dilatometer, 0.15 to 0.3% Ni, 0.15 to 0.28% V, 0.15 to 0.3% Mo). The study was conducted on a cylindrical specimen of φ25 mm long and 100 mm. The specimen was machined from a cast rod of φ35 mm and a length of 400 mm. Molten iron in the МГП-52 laboratory induction furnace smelting, and in 1440 ~ 1460 ℃ in the ladle with magnesium, magnesium metamorphic treatment. In order to avoid white castings,