| LIU Jin-gang,ZHENG Wen-jie,WANG Gao-sheng,HE Li-hong,ZHAO You-hong.Study On Wear Resistance of 20Cr2Ni4A Steel Surface WC Reinforced Iron-based Coating[J],50(6):236-242 |
| Study On Wear Resistance of 20Cr2Ni4A Steel Surface WC Reinforced Iron-based Coating |
| Received:August 03, 2020 Revised:October 25, 2020 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.06.026 |
| KeyWord:wear resistant coating 20Cr2Ni4A laser cladding wear extent microhardness |
| Author | Institution |
| LIU Jin-gang |
School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
| ZHENG Wen-jie |
School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
| WANG Gao-sheng |
School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
| HE Li-hong |
Hunan Institute of Engineering, Xiangtan , China |
| ZHAO You-hong |
School of Mechanical Engineering, Xiangtan University, Xiangtan , China |
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| Abstract: |
| To prepare excellent wear-resistant coatings for the surface of mechanical parts, which can effectively increase their service life and reduce various failures caused by mechanical equipment wear. Using 20Cr2Ni4A alloy steel as the matrix material, the iron-based coating and the iron-based/WC composite coating were prepared by laser cladding technology. By using X-ray diffraction (XRD), metallurgical microscope and scanning electron microscope (SEM), HV-1000 micro Vickers hardness tester, the phase composition, structure, morphology and microhardness of iron-based coating and iron-based/WC composite coating are characterized respectively; HRS-2M high-speed reciprocating friction and wear tester was used to study the wear resistance of iron-based coatings and iron-based/WC composite coatings, and analyze their wear mechanisms. The microhardness of the two coatings was improved more than that of the substrate. Among them, the iron-based/WC composite coating was improved the most, with an average surface hardness of 610HV. Taking GCr15 with a diameter of 6 mm as the friction pair, the average friction coefficient of the iron-based coating is about 0.53 and the wear amount is 0.1432 mm3, while the average friction coefficient of the iron-based/WC composite coating is only about 0.36, and the wear amount is only 0.059 35 mm3. Compared with the iron-based coating, the hardness of the 20Cr2Ni4A alloy steel surface combined with the iron-based/WC composite coating is increased by about 17%, and the amount of wear is reduced by 58.6%, which shows good wear resistance. W2C, WC, Fe3C and other phases, which are evenly distributed on the iron-based coating as a wear-resistant framework, can significantly improve the hardness of the coating and wear resistance. |
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