**4. Conclusions**

In order to improve the wear resistance and thermal fatigue resistance of gray cast iron surface. As a result of previous studies, this paper makes some innovations and improvements. In order to improve the performance of the whole surface, the original average distribution hardening model was designed as a non-uniform distribution hardening model. The results showed that the structure, hardness, and grain size of the melting zone can be strengthened by the model of non-uniform strengthening, and the wear resistance and fatigue resistance of the whole gray cast iron surface can be improved. The specific innovative conclusions of this paper are as follows:


**Author Contributions:** Conceptualization, H.Y. and T.Z.; data curation, H.Z. and Q.W.; funding acquisition, H.Z.; methodology, H.Y.; project administration, H.Z.; validation, H.Y.; writing—original draft, T.Z.; writing—review and editing, H.Y. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by Project 985-High Performance Materials of Jilin University, Project 985-Bionic Engineering Science and Technology Innovation, National Natural Science Foundation of China (U1601203), and double first-class project by Jilin Province and Jilin University (SXGJXX2017-14).

**Acknowledgments:** Acknowledgments are made to the Key Laboratory of Automobile Materials of Jilin University for the use of scanning electron microscopy and X-ray di ffraction.

**Conflicts of Interest:** The authors declare no conflict of interest regarding the publication of this paper. I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously, and not under consideration for publication elsewhere, in whole or in part. All the authors listed have approved the manuscript that is enclosed.
