**4. Conclusions**

In metal additive manufacturing of non-interlayer cooling deposition, the macro-size is difficult to control due to the heat accumulation effect. In this work, the interlayer cooling effect was studied by cladding Ni-based coatings on a ductile iron substrate with different powers. By comparing the microstructures and mechanical properties of the Ni-based alloy cladding on ductile iron with and without interlayer cooling, the following conclusions can be drawn:


**Author Contributions:** Investigation, Z.Z. and W.H.; Data Curation, J.C. and F.X.; Writing—Original Draft Preparation, Y.H.; Writing—Review and Editing, Y.L. and J.S.; Project Administration, Y.H.; Funding Acquisition, J.Y. and Y.H. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the National Key Research and Development Program of China (Grant No. 2017YFB1103200), Natural Science Foundation of Jiangsu Universities (Grant Nos. 17KJB510031, BK20190712), Six Talent Peaks Project in Jiangsu Province (Grant No. TD-GDZB-009) and Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX19\_0814), Nantong Key Laboratory of 3D printing technology and Application CP12016002.

**Conflicts of Interest:** The authors declare no conflict of interest.
