| ZHANG Xu,MA Yue-jin,ZHAO Jian-guo,LI Jian-chang,LIU Jin-sheng,HAO Jian-jun.Microsturcture and Wear-ability of the Stubble-cleaning Cutter with Flame Spray Welding Fe6 Coating[J],44(10):40-45 |
| Microsturcture and Wear-ability of the Stubble-cleaning Cutter with Flame Spray Welding Fe6 Coating |
| Received:June 19, 2015 Revised:October 20, 2015 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2015.10.007 |
| KeyWord:stubble-cleaning cutter oxyacetylene flame sprays welding Fe6 coating microstructure coefficient of friction wear resistance |
| Author | Institution |
| ZHANG Xu |
College of Mechanical and Electric Engineer, Agriculture University of Hebei, Baoding , China |
| MA Yue-jin |
College of Mechanical and Electric Engineer, Agriculture University of Hebei, Baoding , China |
| ZHAO Jian-guo |
College of Mechanical and Electric Engineer, Agriculture University of Hebei, Baoding , China |
| LI Jian-chang |
College of Mechanical and Electric Engineer, Agriculture University of Hebei, Baoding , China |
| LIU Jin-sheng |
College of Mechanical and Electric Engineer, Agriculture University of Hebei, Baoding , China |
| HAO Jian-jun |
College of Mechanical and Electric Engineer, Agriculture University of Hebei, Baoding , China |
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| Abstract: |
| Objective To solve the problem of lack of wear resistance, frequent scrapping and replacement of the stubble-cleaning cutter. Methods Fe6 coating was prepared on Q235 steel substrate with flame spray welding technology. The hardness, microstructure and wear resistance were investigated by scanning electron microscope, energy depressive spectroscopy, X-ray diffractometer, microhardness tester and reciprocating friction testing machine, and the contrast test of the coefficient of friction and the wear loss was conducted between the original 65Mn stubble-cleaning cutter and the coating. Results The metallurgical bond between coating and matrix was well formed. The microstructure of the coating was mainly composed of Fe-Cr-Ni phase, Cr7C3 phase, Cr23 C6 phase and Cr2 B phase. The average surface hardness of the Fe6 coating was about 56. 6HRC and was almost 2 times that of the Q235 steel. The coefficient of friction of the Fe6 coating was about 0. 65 and was about 2 / 3 of that of the 65Mn stubble-cleaning cutter sample. After 3 hours of wear weight loss experiment, the difference of the wear weight loss between Fe6 coating and 65Mn sample was about 1 fold. Conclusion After welding, the hardness and wear resistance of the stubble-cleaning cutter were significantly increased and the service life could be effectively extended. This study provides a reliable basis for the popularization and application of the flame spray welding Fe6 coating in wear-resistant strengthening and repairing of stubble-cleaning cutter, and at the same time also provides theoretical and practical basis for the surface strengthening of other easy-wear parts in the agricultural machinery. |
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