| ZHAO Fei,ZHANG Liang,WU Zhisheng,WEN Baoan.Effect of Cr3C2/WC on Wear and Corrosion Resistance of Stellite 12 Cladding Layer[J],53(1):135-142 |
| Effect of Cr3C2/WC on Wear and Corrosion Resistance of Stellite 12 Cladding Layer |
| Received:October 17, 2022 Revised:March 13, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.01.013 |
| KeyWord:laser cladding composite cladding layer microhardness friction and wear behavior wear mechanism electrochemical corrosion behavior |
| Author | Institution |
| ZHAO Fei |
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan , China |
| ZHANG Liang |
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan , China |
| WU Zhisheng |
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan , China |
| WEN Baoan |
School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan , China |
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| Abstract: |
| The properties of composite cladding layers prepared by laser cladding technology will vary considerably with the reinforcing phase. In order to study the effect of different carbide contents on the properties of the Stellite 12 cladding layer, the raw material used was Stellite 12 alloy powder with carbide (Cr3C2 and WC). In addition, 30 cm×30 cm×10 cm H13 steel was adopted as the substrate, on which Stellite 12, Stellite 12+10%Cr3C2 and Stellite 12+10%WC were prepared by laser cladding technology. The three cladding layers of Stellite 12, Stellite 12+10%Cr3C2 and Stellite 12+10%WC were then cut, ground and polished and corroded with aqua regia. The microstructures of layers were analyzed by ultra-deep field microscopy, the surfaces were examined by Xrd to analyze the physical phases and the hardness, wear resistance and corrosion resistance were evaluated by microhardness testing, friction wear testing and electrochemical corrosion testing, respectively. The wear scar morphology was also analyzed by ultra-deep field microscopy. The metallurgical results showed that the microstructures of the cladding layers were dominated by columnar crystals and dendrites after the addition of carbides, with the grain transformation from bottom to top being flat crystals to columnar crystals and then to dendrites and good metallurgical bonding at the surface of the bonding interface. Xrd inspection results showed that the three cladding layers had phases mainly composed of γ-Co solid solution and carbides (M23C6, M7C3), but the addition of WC led to the precipitation of Co6W6C and M7C hard phases. In terms of microhardness, the melt layer of Stellite 12 was 610HV0.2, the addition of Cr3C2 reduced the hardness of the melt layer to 530HV0.2 and the addition of WC increased its hardness to 750HV0.2. The wear performance was analyzed in terms of its average friction coefficient, wear profile and wear volume. The addition of Cr3C2 reduced the average coefficient of friction from 0.324 28 to 0.291 87 and the wear volume from 0.45 mm3 to 0.33 mm3, a decrease of 28%, but the wear depth did not change much, while the addition of WC reduced the average coefficient of friction from 0.324 28 to 0.115 58 and the wear volume from 0.45 mm3 to 0.19 mm3, a decrease of 43%, and the wear depth became shallow, from 70 µm to about 30 µm. The wear mechanism of the three cladding layers was mainly abrasive wear and adhesive wear, as analyzed by ultra-deep field microscopy. The polarization curve showed that the corrosion potential of Cr3C2 increased from −0.385 V to −0.264 V, the corrosion current density decreased from 9.269×10−10 A/cm2 to 1.496×10−10 A/cm2 and the polarization resistance increased from 3.982×107 Ω.cm2 to 2.424×108 Ω.cm2, an increase of one order of magnitude. The corrosion resistance was significantly improved, while the addition of WC led to a reduction in corrosion resistance. Compared to the two carbide-added cladding layers, the addition of WC increases the hardness by about 1.4 times compared to the addition of Cr3C2, the depth of wear marks is almost 40 µm shallower and the wear is about 57% less, but the corrosion resistance is reduced and the self-corrosion potential is shifted to the left by 0.131 V. |
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