| XIE Fang,GAO Jin-jie,ZHAI Chang-sheng,YAN Song-shan,HU Rui,XU Chun-xia.Effects of Remelting Temperature on Microstructure and Properties of Induction Remelting Ni Based Coating on GCr15 Bearing Steel[J],50(7):250-257 |
| Effects of Remelting Temperature on Microstructure and Properties of Induction Remelting Ni Based Coating on GCr15 Bearing Steel |
| Received:November 23, 2020 Revised:March 02, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.07.026 |
| KeyWord:induction remelting nickel-based coating remelting temperature microstructure interfacial properties microhardness |
| Author | Institution |
| XIE Fang |
Nanyang Institute of Technology, Nanyang , China |
| GAO Jin-jie |
Nanyang Institute of Technology, Nanyang , China;Xi’an Jiaotong University, Xi’an 45000, China |
| ZHAI Chang-sheng |
Nanyang Institute of Technology, Nanyang , China;Henan Hangong Machinery Remanufacturing Technology Co., Ltd, Nanyang , China |
| YAN Song-shan |
Wuhan University of Technology, Wuhan , China |
| HU Rui |
Nanchang Institute of Technology, Nanchang , China |
| XU Chun-xia |
Nanchang Institute of Technology, Nanchang , China |
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| Abstract: |
| In order to obtain the optimized induction remelting process parameters and improve the microstructure and properties of nickel-based coating on GCr15 bearing steel surface. Ni60A coatings were prepared on GCr15 bearing steel substrate by high energy flame spraying, and then were remelted at 960 ℃, 1012 ℃ and 1052 ℃ respectively to obtain three kinds of induction remelting nickel-based coatings. The porosity, microstructure and microhardness of the three kinds of coatings were measured and compared by metallographic microscope, scanning electron microscope, X-ray diffractometer and microhardness tester. The effect of remelting temperature on the microstructure and properties of the coating was discussed, and the formation mechanism and strengthening mechanism of the coating were revealed. Compared with the induction remelting coating prepared at 960 ℃ and 1052 ℃, the remelting coating prepared at 1012 ℃ is more compact, with a porosity of only 0.27%. The number and size of defects are significantly reduced, and the number of hard phases is significantly increased. Moreover, Ni and Fe elements are mixed and cross-distributed at the interface, forming a strong metallurgical fusion zone, which is conducive to improving the interface bonding strength between the coating and the substrate. In addition, the average microhardness of the surface and interface fusion zone of the coating is higher than that of the other two coatings, and the hardness difference is small. Reasonable control of remelting temperature can effectively improve the microstructure and properties of Ni-based coating, the interface bonding characteristics between the coating and the substrate, and improve the microhardness of the coating. |
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