18Cr_2Ni_4WA钢具有良好的综合机械性能和工艺性能,用于制造重负荷关键零件如大功率发动机齿轮和曲轴等。由于零件在交变循环大负荷下工作,材料的疲劳性能特别受到重视、对此已进行了大量试验、分析和研究[1,2]。随着发动机马力成倍增加,不断要求提高钢的综合机械性能,特别是耐疲劳性能。近年来,国内外大量采用真空冶炼和电渣重熔 18Cr_2Ni_4WA steels have good overall mechanical and process properties for the manufacture of heavy duty critical components such as high power engine gears and crankshafts. As the parts work under cyclic load, the fatigue performance of materials has been paid more attention, and a great deal of experiments, analysis and research have been done on this [1,2]. As engine horsepower multiplies, there is an ongoing need to improve the overall mechanical properties of the steel, especially its fatigue resistance. In recent years, a large number of vacuum smelting and electroslag remelting at home and abroad