Self-Grinding Silage Knife Strengthened with Ni–WC Alloy Prepared by Laser Cladding
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Materials
2.2. Laser Cladding
2.3. Organizational Structure Observation
2.4. Charpy Test
2.5. Test of Wear Resistance and Analysis
2.6. Field Test
3. Test Results and Discussion
3.1. Microstructure of the Cladding Layer
3.2. Phase Analysis of the Cladding Layer
3.3. Laser Cladding Hardness Testing
3.4. Impact Toughness Test
- ak—Impact toughness, J/cm2;
- Ak—Impact absorption energy, J;
- S—Standard fracture surface area of the impact test, cm2.
3.5. Wear Resistance Analysis
- —fracture toughness;
- H—hardness;
- C—coefficient of friction.
4. Field Experiments on a Laser Cladding Self-Sharpening Cutter
5. Conclusions
- (1)
- In this study, a Ni–WC alloy layer was made at the surface of the cutting edge by laser cladding. A microstructure of typical rapid directional solidification was formed in the cladding layer that was dense and without defects such as cracks and gas holes. A metallurgical combination was formed between the substrate and cladding layer. Obvious composition dilution did not take place at the cladding layer;
- (2)
- A large number of hard phases formed during the laser cladding, increasing the hardness of the cladding layer. The chosen hardness value of the cladding layer was approximately 1100 HV(0.2), and the average hardness value was approximately 1000 HV(0.2). The hardness of the cladding layer was obviously higher than that of the substrate, but there was a good hard gradient between the cladding layer and the substrate;
- (3)
- The laser cladding increased the impact toughness of the knife to a large degree. When the laser power was 1600 W, the cladding layer had a combined high hardness and toughness and the best wear resistance. The friction mass loss of the 65 Mn steel was approximately four times that of the cladding layer;
- (4)
- Contrasting with common knives made with 65 Mn steel, a self-sharpening edge was formed during operation for the knives after laser cladding with the Ni–WC alloy. The sharp cutting edge of the laser cladding knives was still kept after usage for 76 h. The wear resistance and cutting performance increased sharply due to the laser cladding;
- (5)
- The successful manufacturing the self-grinding knife using laser cladding increased the working performance and cost effectiveness, while ensuring excellent work efficiency. The tool’s life increased by more than double, with only a 30% cost increase. This product has a large market and strong application in agricultural machinery.
Author Contributions
Funding
Conflicts of Interest
References
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Material | C | Si | Cr | Mn | S | P | Ni | Fe | B |
---|---|---|---|---|---|---|---|---|---|
65 Mn knife (wt%) | 0.64 | 0.23 | 0.23 | 1.15 | 0.028 | 0.032 | 0.15 | ||
Nickle alloy (wt%) | 0.4 | 4 | 15 | 69.4 | 8 | 3.2 |
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Xu, L.; Song, Z.; Li, M.; Li, F.; Guo, J.; Gao, M. Self-Grinding Silage Knife Strengthened with Ni–WC Alloy Prepared by Laser Cladding. Appl. Sci. 2021, 11, 10236. https://doi.org/10.3390/app112110236
Xu L, Song Z, Li M, Li F, Guo J, Gao M. Self-Grinding Silage Knife Strengthened with Ni–WC Alloy Prepared by Laser Cladding. Applied Sciences. 2021; 11(21):10236. https://doi.org/10.3390/app112110236
Chicago/Turabian StyleXu, Lingfeng, Zhanhua Song, Mingxiang Li, Fade Li, Jing Guo, and Ming Gao. 2021. "Self-Grinding Silage Knife Strengthened with Ni–WC Alloy Prepared by Laser Cladding" Applied Sciences 11, no. 21: 10236. https://doi.org/10.3390/app112110236
APA StyleXu, L., Song, Z., Li, M., Li, F., Guo, J., & Gao, M. (2021). Self-Grinding Silage Knife Strengthened with Ni–WC Alloy Prepared by Laser Cladding. Applied Sciences, 11(21), 10236. https://doi.org/10.3390/app112110236