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在疲劳强度计算中,有一个表面加工系数,它说明,当提高零部件的表面加工情况时,可以提高零部件的疲劳强度。本文对水轮机转轮材料ZG20MnSi进行了水下腐蚀疲劳的试验研究,试验中成功地应用了自行设计的腐蚀液循环装置及腐蚀盒。对比试验了▽4和▽9两种试样。升降法的试验结果表明,改善表面加工状态,并不明显提高该种材料的腐蚀疲劳强度。本文所提供的材料腐蚀疲劳强度的数据可供水轮机转轮设计使用。
Fatigue strength calculation, there is a surface processing factor, which shows that when the surface of parts to improve the processing conditions, you can improve the fatigue strength of parts. In this paper, the underwater corrosion fatigue test of ZG20MnSi was carried out, and the corrosion liquid circulation device and corrosion box designed by ourselves were successfully applied. Contrast tested ▽ 4 and ▽ 9 two kinds of samples. The test results of the lifting method show that improving the surface processing condition does not obviously improve the corrosion fatigue strength of the material. The data on the corrosion fatigue strength of the materials provided in this paper are available for turbine runner design.