Open Access
Table 1
Summary of the surface topography state corresponding to conditions A, B, C and D.
| Concentration | Surface scratch | Ploughing | Other phenomenon |
|---|---|---|---|
| 0% | Many | Many and deep | Local spalling |
| 1.0% | Obvious | Many and deep | Local spalling |
| 2.0% | Obvious | Few and shallow | Wide-range spot |
| 4.0% | Few | Few and shallow | Local spalling |
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