# Microstructure and wear resistance of Fe-Cr-C-Mo-V-Ti-N hardfacing layers

**Authors:** Won Chol Son, Yong Gwang Jong, Myong Chol Pak, Jin Song Ma  
**arXiv:** [2104.11402](https://arxiv.org/abs/2104.11402)  
**Date:** 2021-04-23  
**Summary page:** https://www.summarizepaper.com/en/paper/2104.11402v1/

## Key points

- Authors aimed to improve wear resistance of components using Fe-Cr-C-Mo-V-Ti-N hardfacing coatings
- Coatings obtained using shielded manual arc welding (SMAW) method
- Ferroalloys added into coating flux and jointly nitrided to enhance properties
- Microstructure analysis conducted using XRD, OM, FESEM, and EDS techniques
- FactSage 7.0 software used to calculate equilibrium phase diagram of hardfacings
- Wear resistance tests performed on pin-on-disc machine
- Fe-Cr-C-Mo-V-Ti-N hardfacings showed higher wear resistance compared to cladding layers without nitrides
- Five layers of hardfacing deposited onto each steel substrate using SMAW method for homogeneous specimen
- Welding parameters and total thickness of layer carefully controlled during deposition
- Specimens cut from longitudinal section of weld layer for further analysis after grinding and polishing processes.

## Summary

In this paper, the authors aimed to improve the wear resistance of components such as screws under severe friction-wear by developing Fe-Cr-C-Mo-V-Ti-N hardfacing coatings. These coatings were obtained using the shielded manual arc welding (SMAW) method. To enhance their properties, ferroalloys were added into the coating flux of the hardfaced electrode and jointly nitrided. The microstructure analysis of the coatings was conducted using various techniques including X-ray diffraction (XRD), optical microscope (OM), field emission scanning electron microscope (FESEM), and energy dispersive X-ray spectrometry (EDS). Additionally, FactSage 7.0 software was utilized to calculate the equilibrium phase diagram of the hardfacings. To evaluate their performance, wear resistance tests were performed on a pin-on-disc machine. The results showed that the Fe-Cr-C-Mo-V-Ti-N hardfacings exhibited higher wear resistance compared to cladding layers without nitrides. In terms of manufacturing process, five layers of hardfacing were deposited onto each steel substrate using SMAW method to ensure a homogeneous specimen. The welding parameters and total thickness of the layer were carefully controlled during deposition. Specimens with specific dimensions were cut from the longitudinal section of the weld layer and subjected to grinding and polishing processes for further analysis.