3.4.1. Analysis of Wear Loss

To compare the wear performance of the samples with different carbon content after laser biomimetic treatment, the biomimetic unit with the same volume proportions was processed on the surface of the base metal. The effect of carbon content on the wear properties of the bionic samples was studied. Figure 14 shows the weight loss of the bionic samples and untreated samples with different carbon content. It can be seen that the wear loss weight of the laser biomimetic samples is significantly reduced compared to that of the untreated samples. To compare the antiwear properties of the biomimetic samples, the weight loss reduction percentage [29] (*WLRP*) is defined, as shown in Equation (2):

$$\text{WLRP} = \frac{\text{WL}\_{\text{LITrated}} - \text{WL}\_{\text{treated}}}{\text{WL}\_{\text{LITrated}}} \times 100\% \tag{2}$$

where *WLUntreated* is the wear-loss weight of the untreated sample, and *WLTreated* is the wear-loss weight of the treated sample.

The WLRP order of the laser biomimetic samples with different carbon content is: LR-A1 (31.01%) < LR-A2 (31.72%) < LR-A3 (36.08%) < LR-A4 (48%) < LR-A5 (67.76%). This order is due to the different hardness between the materials leading to differences in wear resistance. When the hardness of the sample is higher, the wear resistance is better, and the wear loss is smaller.

**Figure 14.** Mass loss of samples.
