**4. Conclusions**

This study investigated the microstructure and thermal stability of CrWN glass molding coatings having different W contents after vacuum annealing. The main conclusions are as follows:


The annealed coating under low W content exhibited a significant age-hardening due to the strain fields originating from the lattice mismatch. The annealed coating under high W content suffered from a severe hardness degradation because the large volume fraction of h-WN seriously weakened the interface strengthening effect.

**Author Contributions:** Conceptualization, Z.X. and F.G.; Methodology, Y.C.; Investigation, X.H. and K.L.; Supervision, Q.C. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work was supported by National Natural Science Foundation of China (51771087), Liaoning Innovative Talents Support Plan (LR2017052), University of Science and Technology Liaoning Talent Project Grants (601011507-07), and the Innovation Team of Liaoning University of Science and Technology (2017TD04).

**Acknowledgments:** We sincerely thank the Institute of Nano Surface Engineering of Shenzhen University for their TEM technical supports.

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