| YIN Quan,PENG Ru-shu,ZHU Hong-mei.Performance Improvement of Iron Base Coating by Laser Cladding In-situ Generated Reinforced Phase[J],45(4):99-104 |
| Performance Improvement of Iron Base Coating by Laser Cladding In-situ Generated Reinforced Phase |
| Received:November 27, 2015 Revised:April 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.04.017 |
| KeyWord:laser cladding composite powder in-situ generation reinforced phase microstructure performance |
| Author | Institution |
| YIN Quan |
School of Mechanical Engineering, University of South China, Hengyang , China |
| PENG Ru-shu |
School of Mechanical Engineering, University of South China, Hengyang , China |
| ZHU Hong-mei |
School of Mechanical Engineering, University of South China, Hengyang , China |
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| Abstract: |
| Objective Laser cladding technology was used to prepare iron base cladding layers containing reinforced phases such as carbon chromium, titanium boron compounds and iron base of titanium oxide on the surface of 304 stainless steel, and the microstructure of the coating and its performance was researched and analyzed, so as to provide theoretical basis for future industrial application. Methods The four kinds of claddings with 5% , 10% , 20% , 30% mass ratios of ilmenite (titanium 70wt% ), iron-boron (boron 70wt% ) and graphite (carbon 99. 9wt% ) composite powder were studied experimentally. The microstructure of laser cladding layers and composition of reinforced particles were analyzed using scanning electron microscope ( SEM) and X-ray diffraction (XRD), the microhardness of the laser cladding layer was tested using optical microscopy hardness tester, and the corrosion resistance of the cladding layer was tested using electricity chemistry workstation. Results The results showed that the cladding layer had no obvious defects such as cracks, porosity, and was well bound with the base material. Reaction occurred in the process of laser cladding among the graphite, ilmenite and boron iron added, and rigid reinforced phases such as Cr23C6,Cr3C2,TiO2,Ti1. 8B50 were in situ generated. With increasing mass fractions of graphite, ilmenite and boron iron, the contents of rigid reinforced phase generated in the cladding layer increased, and the microhardness value of the cladding layer was also obviously improved. The hardness of cladding layer containing 30% of the composite powder was 3. 6 fold as high as that of the base material. The corrosion resistance of the laser cladding specimens was also higher than that of the base material, and it increased with the increasing mass ratio of the composite powder. The corrosion resistance of cladding layer containing 30% of the composite powder was 1. 58 fold as high as that of the base material. Conclusion Iron base cladding layers containing reinforced phases such as carbon chromium, titanium boron compounds and titanium oxide prepared by laser cladding had significantly improved performance than the base material performance. |
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