| CHEN Cui-xin,ZUO Yu-qiang,LIU Bao-xi,LI Yong-yan.Effect of Niobium Content on Microstructure and Wear-resistance for Fe-C-Cr-Nb Surface Deposited Materials[J],47(12):166-172 |
| Effect of Niobium Content on Microstructure and Wear-resistance for Fe-C-Cr-Nb Surface Deposited Materials |
| Received:April 02, 2018 Revised:December 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.12.023 |
| KeyWord:surface deposited materials carbides microstructure refinement hardness wear resistance |
| Author | Institution |
| CHEN Cui-xin |
a.School of Materials Science and Engineering, b.Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, c.Energy Equipment Materials Technology Research Institute, Hebei University of Technology, Tianjin , China |
| ZUO Yu-qiang |
a.School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China |
| LIU Bao-xi |
b.Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, c.Energy Equipment Materials Technology Research Institute, Hebei University of Technology, Tianjin , China |
| LI Yong-yan |
a.School of Materials Science and Engineering, Hebei University of Technology, Tianjin , China |
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| Abstract: |
| The work aims to improve the hardness, the wear resistance and the comprehensive performance of the deposited materials on steel. The Fe-C-Cr-Nb surface deposited materials with different contents of Nb were deposited by gas shielded welding. JmatPro was used to simulate the CCT curve and equilibrium cold reign curve of deposited layers with different contents of Nb and analyze the influence of Nb content on transformation and precipitated phase of deposited structure. The optical microscope, scanning electron microscope and X-ray diffractometer were used to observe the grain size, surface morphology and composition of the deposited layer and analyze the precipitated phase. The macro hardness and wear resistance of the deposited metal were tested by rock well hardness tester and sliding friction wear tester. The microstructure of the deposited layer with different contents of Nb consisted of martensite and some bainite and a large number of MC-type carbides were formed in substrate. When the Nb content was 1.5%, the carbides were dispersed in the deposited structure, and the strengthening effect was the best. At this time, the highest hardness was 55.3HRC. In addition, MC-type carbides had an obvious effect on grain en-forcement, so it could improve the toughness of the deposition. The combination of the hard phase and the tough matrix allowed the wear resistance of the deposited microstructure to reach the best when the Nb content was 1.5%. By adjusting the content of Nb in the Fe-C-Cr-Nb surface deposited materials, the microstructure of deposited materials and the composition and distribution of carbides are effectively controlled to improve the comprehensive performance of the deposition layer. |
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