The variance of the mechnical of 45# steel under high cycle fatigue has heen studied.The result shows:Under high cycle fatigue,cyclical softening of 45# steel is a fact.

• 通过研究45%23钢疲劳循环后材料的力学性能来反映高周疲劳产生的材料软化现象，取得了一些进展。实验结果与假设基本一致。