| ZONG Xue-mei,LI Wen,WANG Jing,YUAN Xiao,ZHU Qing-hai.TIG Weaving Remelting of FeCrBSiWNb Coating by HVAS[J],46(7):195-200 |
| TIG Weaving Remelting of FeCrBSiWNb Coating by HVAS |
| Received:January 25, 2017 Revised:July 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.07.033 |
| KeyWord:high speed arc spraying FeCrBSiWNb coating tungsten electrode argon arc remelting geometric analysis crack weaving remelting Laves phase |
| Author | Institution |
| ZONG Xue-mei |
1.Jiangsu Xuzhou Construction Machinery Research Institute, Xuzhou , China; 2.State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery, Xuzhou , China |
| LI Wen |
1.Jiangsu Xuzhou Construction Machinery Research Institute, Xuzhou , China; 2.State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery, Xuzhou , China |
| WANG Jing |
Jiangsu Xuzhou Construction Machinery Research Institute, Xuzhou , China |
| YUAN Xiao |
Jiangsu Xuzhou Construction Machinery Research Institute, Xuzhou , China |
| ZHU Qing-hai |
Jiangsu Xuzhou Construction Machinery Research Institute, Xuzhou , China |
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| Abstract: |
| The work aims to overcome narrow and inhomogeneous single pass, pores and cracks in the multi-track zone of traditional TIG linear remelted coating by designing a novel tungsten inert gas arc (TIG) weaving remelting process for FeCrBSiWNb coating by high velocity arc spraying (HVAS). The weaving remelting process was designed by geometric analysis and calculation, and FeCrBSiWNb remelted coating was prepared. Phase structure and microstructure of the weaving remelted coating were characterized with X-ray diffractometer (XRD), optical microscope (OM) and scanning electron microscope (SEM). Microhardness of its cross-section was measured with microhardness tester. Designed remelting process parameters: current 53～55 A, X-direction travelling speed 65～68 mm/min and Y-direction travelling speed 485～500 mm/min. The weaving remelted coating was free from crack, and single path width increased. The matrix structure of FeCrBSiWNb remelted coating was mainly composed of martensite, retained austenite and Fe-Cr solid solution. The hard-phase was composed of boride and Laves phase. Various strengthening methods, such as solid-solution strengthening and precipitation hardening, were present in the remelted coating. Microhardness of the remelted coating, heat affected zone (HAZ) and base metal was 820HV0.3, 563HV0.3 and 242HV0.3, respectively. Width of single pass remelted coating is increased by the novel weaving remelting process. And problems such as high residual stress in the coating, which may cause cracks, are effectively solved. |
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