一、绪言最近,等温淬火的球铁因其具有优良的机械性能,可望作为钢的替代材料而引人注目。目前正在进行多方面的研究和应用上的探讨。在许多应用场合,疲劳强度是一重要性能,而有关贝氏体球铁机械性能的报告则对抗拉强度、冲击韧性等介绍较多,对其疲劳强度在广泛的贝氏体相变领域中的情况缺乏系统的研究。 I. Introduction Recently, isothermal quenched ductile iron because of its excellent mechanical properties, is expected to be attractive as a steel alternative. At present, many aspects of research and application are being explored. Fatigue strength is an important property in many applications, while reports on the mechanical properties of bainitic ductile iron show more on tensile strength, impact toughness, etc. The fatigue strength of bainitic ductile iron in the field of extensive bainitic transformation The situation lacks systematic research.