| FAN Qiao-fang,ZHANG Bo,LIN Ying.Re-melting Process and Wear Resistance of Ni60 Alloy Powder in Furnace[J],45(4):226-231 |
| Re-melting Process and Wear Resistance of Ni60 Alloy Powder in Furnace |
| Received:November 23, 2015 Revised:April 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.04.038 |
| KeyWord:Ni60 coating re-melting micro-metallography micro-hardness wear resistance |
| Author | Institution |
| FAN Qiao-fang |
Jiangsu College of Safety Technology, Xuzhou , China |
| ZHANG Bo |
Jiangsu College of Safety Technology, Xuzhou , China |
| LIN Ying |
SKF Dalian Bearings and Precision Technologies Co. Ltd, Dalian , China |
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| Abstract: |
| Objective To acquire the best re-melting process of Ni60 on the surface of 45 steel, and improve the wear resistance of the coating. Methods Prefabricated Ni60 coating was produced by adding two kinds of glue, type A and type B, into Ni60 alloy powder, and dripping a right amount of alcohol. This experiment adopted the two-step re-melting process of pre-cementation and remelting in stove to prepare the nickel-base alloy coating on 45 steel surfaces, studied the impacts of re-melting temperature on the morphology and micro-hardness of the substrate and the coating structure of the samples, and discussed the impact of temperature on the micro-structure and wear resistance of the substrate and the coating structure of the sample. Results Mechanical interlocking were formed between the substrate and the coating at 1000 ℃ or 1100 ℃,while mechanical interlocking and metallurgical bond were formed between the substrate and the coating when the re-melting temperature was 1200 ℃. The number of coating hardening phase increased, the size and distribution of which were even, with minimal amount of defects. Seen from a hardness distribution curve, the quality was the best. Based on the data, the average hardness of the re-melting coating prepared at 1100 ℃ was the highest, reaching 496HV, while the average micro-hardness at the dividing line of the sample obtained by re-melting at 1200 ℃ was the best, reaching 389. 7HV, and the hardness distribution curve of the sample was the most regular. Conclusion Re-melting Ni60 alloy powder on 45 steel surface at 1200 ℃ could effectively improve the binding mode of the substrate and the coating, and gain access to machinery in conjunction with metallurgical bonding of structure morphology. At this temperature, the coating was homogeneous and fine, with regular and relatively stable distribution of the sample hardness as well as the best wear resistance. |
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