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Analysis of the Geometry of Dents on a Propeller Blade Surface during Cavitation Wear
Journal of Friction and Wear ( IF 0.7 ) Pub Date : 2021-03-15 , DOI: 10.3103/s1068366621010116
Y. N. Tsvetkov , E. O. Gorbachenko , Ya. O. Fiaktistov

Abstract

The profile of several dents on a propeller with a diameter of about 2500 mm were measured by the stylus probe method. The predominant mechanism of action during cavitation was found to be the impact of jets occurring at an angle to the blade surface. The diameter of the jets reaches 5 mm, and the impact velocity is several hundred meters per second, while the deformation of the material of dents from single blows of the jets reaches 10%, and the depth of the dents is 0.3 mm. At such depths of dents, the thickness of the hardened layer under the surface of the wear zone can be 3 mm or more, which allows evaluating the contribution of electrochemical corrosion to the total wear of propellers during cavitation in a different way. When testing screw alloys for cavitation wear using ultrasonic magnetostrictive vibrators, the replacement of fresh water with sea water is unreasonable; the corrosive action of sea water can lead to plasticization of the surface layer of the metal due to facilitated dislocation discharge. This is unlikely on propellers, since the depths of work hardening of the blade surface layer are two orders of magnitude greater than the thickness of the plastically deformed layer obtained in experiments with ultrasonic vibrators.



中文翻译:

气蚀磨损过程中螺旋桨叶片表面凹痕的几何形状分析

摘要

通过测针探针法测量螺旋桨上直径约2500 mm的几个凹痕的轮廓。发现空化过程中的主要作用机理是与叶片表面成一定角度发生的射流的冲击。射流的直径达到5mm,冲击速度为每秒几百米,而由射流的单击产生的凹痕材料的变形达到10%,并且凹痕的深度为0.3mm。在这样的凹痕深度下,磨损区表面下的硬化层的厚度可以为3 mm或更大,这允许以不同的方式评估在气蚀过程中电化学腐蚀对螺旋桨总磨损的影响。当使用超声波磁致伸缩振动器测试螺杆合金的气蚀磨损时,用海水代替淡水是不合理的;海水的腐蚀作用会由于位错放电的促进而导致金属表面层的塑化。这在螺旋桨上是不太可能的,因为叶片表面层的工作硬化深度比在超声振动器的实验中获得的塑性变形层的厚度大两个数量级。

更新日期:2021-03-16
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