| ZHOU Chang-huan,LIN Chen,ZHANG Juan-juan,WANG Qing-chun,DU Sheng-en.Effect of Ni-based Solder on Defects of Laser Cladding WC Alloy Layers on 45# Steel[J],47(3):91-95 |
| Effect of Ni-based Solder on Defects of Laser Cladding WC Alloy Layers on 45# Steel |
| Received:October 08, 2017 Revised:March 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.03.015 |
| KeyWord:laser cladding surface engineering pasty Ni-based solder defect friction and wear |
| Author | Institution |
| ZHOU Chang-huan |
School of Mechanical Engineering, Qingdao Technological University, Qingdao , China |
| LIN Chen |
School of Mechanical Engineering, Qingdao Technological University, Qingdao , China |
| ZHANG Juan-juan |
School of Mechanical Engineering, Qingdao Technological University, Qingdao , China |
| WANG Qing-chun |
School of Mechanical Engineering, Qingdao Technological University, Qingdao , China |
| DU Sheng-en |
School of Mechanical Engineering, Qingdao Technological University, Qingdao , China |
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| Abstract: |
| The work aims to reduce defects such as cracks and pores in laser cladding of Ni60A +WC alloy powder. Pasty Ni-based solder (BNi-1a) was added into Ni60A+WC alloy powder to reduce defects such as cracks and pores in laser cladding layers. Provided with power of 1 kW, scanning speed of 4 mm/s and spot diameter of nearly 2 mm, Rofin FL020 fiber laser was used for laser processing of baked pre-coated alloy cladding layers. Microhardness test was conducted to evaluate hardness of the cladding layers, morphology and phase structure of the layers were studied with SEM and XRD. Friction coefficient and wear resistance of the layers were evaluated with UMT and surface morphology tester. Composition of Cr and C alloy phase was optimized, and defects such as cracks and pores were reduced by as pasty Ni-based solder (BNi-1a) was added into Ni60A+WC alloy powder. For the cladding layer with pasty Ni-based solder, friction coefficient was nearly 0.45, friction coefficient of the cladding layer decreased by nearly 18%, wear resistance was also greatly increased, and cross-sectional area was nearly 0.50103 mm. For the cladding layer without pasty Ni-based solder, cross-sectional area of the grinding crack was nearly 0.70103 mm2. The addition of Ni-based solder (BNi-1a) can effectively reduce defects including cracks and pores, and improve wear resistance and reduce hardness, but it may reduce hardness of cladding layers. |
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