激光重熔轨迹对Fe基Ni/WC涂层组织和性能的影响 
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Influences of Laser Remelting Trajectories on Microstructures and Properties of Fe-Based Ni/WC Coatings
江西理工大学机电工程学院, 江西 赣州 341000
图 & 表
图 1. 不同激光重熔轨迹下涂层的表面形貌。(a)打点;(b)矩形;(c)平行;(d)圆形
Fig. 1. Surface morphologies of coatings under different laser remelting trajectories.(a) Dotted; (b) rectangular; (c) parallel; (d) circular
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图 2. 不同激光重熔轨迹重熔层显微形貌。(a)打点;(b)矩形;(c)平行;(d)圆形
Fig. 2. Micro-morphologies of remelted layers under different laser remelting trajectories. (a) Dotted; (b) rectangular; (c) parallel; (d) circular
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图 3. 圆形重熔轨迹涂层元素含量测试。(a)区域;(b)结果
Fig. 3. Element content test of coatings under circular laser remelting trajectories. (a) Area; (b) result
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图 4. 圆形轨迹熔覆表面XRD图谱
Fig. 4. XRD pattern of cladding surface under circular laser remelting trajectories
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图 5. 不同重熔轨迹涂层与基体结合界面的金相图。(a)打点;(b)矩形;(c)平行;(d)圆形
Fig. 5. Metallograph of bonding interface between coating and substrate under different remelting trajectories. (a) Dotted; (b) rectangular; (c) parallel; (d) circular
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图 6. 不同重熔轨迹涂层的显微硬度
Fig. 6. Microhardness of coatings under different remelting trajectories
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图 7. 不同重熔轨迹下的磨损失重
Fig. 7. Wear loss under different remelting trajectories
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图 8. 不同重熔轨迹下涂层干滑动后的SEM图。(a)圆形;(b)打点
Fig. 8. SEM images of coatings after dry sliding under different remelting trajectories. (a) Circular; (b) dotted
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图 9. 干滑动摩擦后平行扫描轨迹SEM图
Fig. 9. SEM image of parallel scanning trajectory after dry sliding friction
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表 1Fe40铁基合金粉末的化学成分(质量分数,%)
Table1. Chemical compositions of Fe40 Fe-based alloy powder (mass fraction, %)
| Element | Ni | Cr | B | Si | C | Fe |
|---|
| Content | 8-12 | 15-20 | 1.5-3 | 1.5-3 | <0.5 | Bal. |
|
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表 2Ni60+35WC镍基碳化钨合金粉末的化学成分(质量分数,%)
Table2. Chemical compositions of Ni60+35WC nickel tungsten carbide powder (mass fraction, %)
| Element | Ni | Cr | B | Si | C | Fe | WC |
|---|
| Content | Bal. | 15-20 | 3.0-4.5 | 3.5-5.5 | 0.5-1.1 | ≤10 | 35 |
|
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表 3不同激光重熔轨迹的工艺参数
Table3. Process parameters under different laser remelting trajectories
| Trajectory | Power /W | Scanning speed /(mm·min-1) | Spot diameter /mm | Energy density /(W·mm-1·s-1) |
|---|
| Dotted | 500 | 200 | 1.5 | 48 | | Rectangular | 500 | 200 | 1.5 | 144 | | Parallel | 500 | 200 | 1.5 | 91 | | Circular | 500 | 200 | 1.5 | 97 |
|
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表 4摩擦磨损实验参数
Table4. Experimental parameters of friction and wear
| Parameter | Normal load /N | Rotating speed /(r·min-1) | Wear time /s | Test temperature /℃ |
|---|
| Value | 350 | 200 | 1800 | 20 |
|
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表 5不同重熔轨迹表面的孔隙率
Table5. Surface porosity of coatings under different remelting trajectories
| Trajectory | Sample 1 | Sample 2 | Sample 3 | Sample 4 | Sample 5 | Average |
|---|
| Dotted | 4.3% | 4.1% | 4.5% | 4.2% | 4.7% | 4.36% | | Rectangular | 3.4% | 3.8% | 3.1% | 3.5% | 3.6% | 3.48% | | Parallel | 2.2% | 2.5% | 2.7% | 2.5% | 2.8% | 2.54% | | Circular | 2.0% | 2.1% | 2.5% | 2.6% | 2.4% | 2.32% |
|
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赵运才, 杜辉辉, 上官绪超, 何文. 激光重熔轨迹对Fe基Ni/WC涂层组织和性能的影响[J]. 激光与光电子学进展, 2018, 55(4): 041404. Yuncai Zhao, Huihui Du, Xuchao Shangguan, Wen He. Influences of Laser Remelting Trajectories on Microstructures and Properties of Fe-Based Ni/WC Coatings[J]. Laser & Optoelectronics Progress, 2018, 55(4): 041404.
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