以不同Zn含量的铸铁为研究对象,研究了不同温度时铸铁的冲击韧度和断口形貌。结果表明,随温度的降低,铸铁的冲击韧度呈降低的趋势。其中铸铁在常温时具有最大的冲击韧度,为21.2J,此时Zn含量为0.33%。随铸铁中Zn含量的增加,铸铁的冲击韧度先急剧增加,然后趋于稳定。当Zn含量为0.33%时,不同温度下的铸铁均达到最高值。 With different Zn content of cast iron as the research object, the impact toughness and fracture morphology of cast iron at different temperatures were studied. The results show that with the decrease of temperature, the impact toughness of cast iron shows a decreasing trend. Cast iron at room temperature, which has the largest impact toughness, 21.2J, Zn content at this time was 0.33%. With the increase of Zn content in cast iron, the impact toughness of cast iron firstly increases sharply and then tends to be stable. When the content of Zn is 0.33%, the cast iron has reached the highest value under different temperatures.