**E**ff**ect of Composition on the Mechanical Properties and Wear Resistance of Low and Medium Carbon Steels with a Biomimetic Non-Smooth Surface Processed by Laser Remelting**

### **Geng Chang 1,2, Ti Zhou 1,3,\*, Hong Zhou 1,2, Peng Zhang 1,2, Siyuan Ma 1,2, Benfeng Zhi 1,2 and Siyang Wang 1,2**


Received: 19 November 2019; Accepted: 18 December 2019; Published: 24 December 2019

**Abstract:** To study the e ffect of laser biomimetic treatment on di fferent material compositions, five kinds of steels with di fferent carbon element contents were studied by laser remelting. The characteristics (depth, width), microstructure, hardness, tensile properties, and wear resistance of the samples were compared. The results show that when the laser processing parameters are fixed, the characteristics of the unit increase with an increase of carbon element content. Moreover, the hardness of the unit also increases. Compared with the untreated samples, when the carbon content is 0.15–0.45%, the tensile strength of the laser biomimetic samples is higher than that of the untreated samples. For the biomimetic samples with di fferent carbon content, with an increase of carbon content, the tensile strength increases first and then decreases, while the plasticity of the biomimetic samples decreases continuously. The bionic samples have better wear resistance than that of the untreated samples. For bionic specimens with di fferent carbon elements, wear resistance increases with an increase of carbon element content.

**Keywords:** composition; laser bionic unit; tensile properties; wear resistance
