关键词: 轴类零件, 热处理, 强韧性, 低温冲击性能, 疲劳

Abstract: Through the comparison of microstructure and properties of the high-end axle parts materials (35CrMoA, EA4T, EA1N, DZ2, 30CrNiMoV12, etc.), and the high-end shaft parts materials (35CrMo, 40CrNi2MoA, 34CrNiMo6, 30CrNiMo8, etc.) for rail transit after heat treatment, the materials for shaft parts were optimized. The comparison test results of axle parts show that, the strength and toughness of 30CrNiMoV12 steel after heat treatment is much higher than other materials, and its impact toughness, notch sensitivity and fatigue strength are the best in axle parts materials. It is the best choice for the axle parts with high-strength and structural size limitations, or under the conditions of frigid zone. The DZ2 material can be the secondary choice. The EA4T steel performance is close to DZ2 steel, but its low temperature impact toughness is not as stable as DZ2 steel. The overall strength of EA1N steel is only half of the 30CrNiMoV12 steel. The comparison test results of shaft parts show that, after heat treatment, 40CrNi2MoA, 34CrNiMo6, 30CrNiMo8 steels have good toughness, good low temperature impact toughness and stability, 30CrNiMo8 steel has better fatigue strength and lower notch sensitivity, suitable for high strength shaft and application under the conditions of frigid zone. In contrast, the strength of 35CrMo steel is slightly lower, its low temperature impact toughness is better, slightly lower than other materials and its stability needs to be improved.

Key words: shaft parts, heat treatment, toughness, low temperature impact toughness, fatigue