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A maximum wear volume and coefficient of friction reduction of 95% was observed.
Table 2 shows the mean and standard deviation of assessed parameters (pull-out forces, maximum wear, volume wear) of each round of CS.
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With the annual transport volume increasing, average wear volume and maximal wear volume of rail side each month reach 1.98 mm and 4.16 mm, respectively.
The update of the wheel profile wear was established when the maximum wear value reached 0.1 mm or the operation distance reached 1,500 or 2,500 km.
The Kolmogorov-Smirnov test and a visual inspection of the histograms and the quantile-quantile plot showed no significant divergence from the normal distribution in any of the groups (maximum wear depth after CS, volume wear after CS, pull-off forces without and after CS). 3.
The transfer of material, the change in the wear volume and the maximum wear depth with the number of cycles were measured through 3D mapping of the topography of the fretted surface.
The heat-treated coatings show 15.4% higher maximum hardness and 60% lower minimum wear volume than the as-sprayed one.
One-way ANOVA showed differences neither in pull-out forces F 3,16) = 0.02, p = 0.997, nor in maximum wear F 3,15) = 0.39, p = 0.764, or volume wear F 3,15) = 0.77, p = 0.530, among the four rounds of CS (Table 3), thereby demonstrating stable and comparable conditions within all rounds of CS. 4.
For the later wear stages, the wear volume for LM was the greatest and the wear ranges the widest; and the wear volume for XP55 the smallest.
Natural aged specimen observed maximum wear resistance.
Friction coefficient and wear volume were used as characterization parameters.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com