激光重熔A356铝合金表面的力学性能 
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Mechanical Properties of A356 Aluminum Alloy after Laser Surface Remelting
燕山大学机械工程学院, 河北 秦皇岛 066000
图 & 表
图 1. 显微硬度测试点示意图
Fig. 1. Schematic of microhardness test points
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图 2. 三点弯曲试验示意图
Fig. 2. Schematic of three-point bending experiment
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图 3. A356铝合金经过不同功率激光重熔处理后的显微组织全貌。(a) 1000 W;(b) 1500 W;(c) 2000 W
Fig. 3. Microstructures of A356 aluminum alloy after laser remelting treatment at different power. (a) 1000 W; (b) 1500 W; (c) 2000 W
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图 4. 不同激光功率下得到的重熔层的显微组织。(a) 1000 W;(b) 1500 W;(c) 2000 W
Fig. 4. Microstructures of remelting layer obtained at different laser power. (a) 1000 W; (b) 1500 W; (c) 2000 W
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图 5. 基板区的EDS能谱图。(a) EDS测试点分布图;(b) Spot 1点的EDS能谱图;(c) Spot 2点的EDS能谱图;(d) Spot 3点的EDS能谱图
Fig. 5. EDS spectra of substrate area. (a) EDS test points distribution map; (b) EDS spectrum of Spot 1point; (c) EDS spectrum of Spot 2 point; (d) EDS spectrum of Spot 3 point
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图 6. 2000 W激光功率下得到的重熔层的XRD图谱
Fig. 6. XRD patterns of remelting layer obtained at laser power of 2000 W
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图 7. 2000 W激光功率下得到的重熔层各区域的SEM图。(a)重熔区,×1000;(b)热影响区,×1000;(c)基板区,×1000;(d)重熔区,×3000;(e)热影响区,×3000;(f)基板区,×3000
Fig. 7. SEM images of each region in remelting layer obtained at laser power of 2000 W. (a) Remelting zone, ×1000; (b) heat affected zone, ×1000; (c) substrate zone, ×1000; (d) remelting zone, ×3000; (e) heat affected zone,×3000; (f) substrate zone, ×3000
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图 8. 显微硬度图。(a)显微硬度柱状图;(b) 2000 W激光功率下得到的重熔层的显微硬度图;(c) 1500 W激光功率下得到的重熔层的显微硬度图;(d) 1000 W激光功率下得到的重熔层的显微硬度图
Fig. 8. Microhardness diagrams. (a) Microhardness histogram; (b) microhardness of remelting layer obtained at laser power of 2000 W; (c) microhardness of remelting layer obtained at laser power of 1500 W; (d) microhardness of remelting layer obtained at laser power of 1000 W
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图 9. 弯曲试验结果。(a)基体试样及不同激光功率下得到的熔覆试样的弯曲试验结果;(b) A356基体的Fcr局部图;(c) 1000 W激光功率下获得的熔覆试样的Fcr局部图;(c) 1500 W 激光功率下获得的熔覆试样的Fcr局部图; (d) 2000 W 激光功率下获得的熔覆试样的Fcr局部图
Fig. 9. Bending test results. (a) Bending test results of substrate sample and remelting samples obtained at different laser power; (b) partial view of Fcr for A356 base metal; (c) partial view of Fcr for remelting sample obtained at laser power of 1000 W; (c) partial view of Fcr for remelting sample obtained at laser power of 1500 W; (d) partial view of Fcr for remelting sample obtained at laser power of 2000 W
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图 10. 不同试样中弯曲裂纹的金相图。(a) A356铝合金基体;(b) 1000 W激光功率下获得的重熔试样;(c) 1500 W激光功率下获得的重熔试样;(d) 2000 W激光功率下获得的重熔试样
Fig. 10. Metallographic images of bending cracks in different samples. (a) A356 aluminum alloy base material; (b) remelting sample obtained at laser power of 1000 W; (c) remelting sample obtained at laser power of 1500 W; (d) remelting sample obtained at laser power of 2000 W
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表 1A356铝合金的化学成分
Table1. Chemical composition of A356 aluminum alloy
| Element | Al | Cu | Si | Mg | Zn | Fe | Mu | Ti |
|---|
| Mass fraction /% | Bal. | ≤0.20 | 6.5--7.5 | 0.25--0.45 | ≤0.1 | ≤0.20 | ≤0.1 | ≤0.20 |
|
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表 2基板区的EDS测试结果
Table2. ESD results of substrate area
| No. | Element | Mass fraction /% | Atomic fraction /% | Net intensity | Error /% |
|---|
| Mg | 1.53 | 1.70 | 383.30 | 3.87 | | Spot 1 in Fig.5 | Al | 96.30 | 96.45 | 23347.11 | 1.44 | | Si | 1.58 | 1.52 | 131.67 | 10.40 | | Ti | 0.59 | 0.33 | 56.33 | 14.35 | | Al | 30.00 | 30.94 | 8340.58 | 1.79 | | Spot 2 in Fig.5 | Si | 69.40 | 68.76 | 13226.19 | 4.43 | | Fe | 0.61 | 0.30 | 40.58 | 18.22 | | Spot 3 in Fig.5 | Al | 84.62 | 85.14 | 22045.66 | 1.20 | | Si | 15.38 | 14.86 | 1505.87 | 7.76 |
|
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表 3不同激光功率下得到的重熔层中各相的尺寸
Table3. Size of each phase in remelting layer obtained at different laser power
| Power /W | Size in remeltingzone /μm | Size in heataffected zone /μm |
|---|
| α-Al | Al-Si | α-Al | Al-Si |
|---|
| 2000 | 14.3 | 4.5 | 19 | 6.2 | | 1500 | 9.3 | 3.3 | 16.3 | 4.2 | | 1000 | 6.5 | 2 | 14.6 | 3 |
|
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王建刚, 高士友, 陈旭升, 张梦雨. 激光重熔A356铝合金表面的力学性能[J]. 中国激光, 2020, 47(4): 0402002. Wang Jiangang, Gao Shiyou, Chen Xusheng, Zhang Mengyu. Mechanical Properties of A356 Aluminum Alloy after Laser Surface Remelting[J]. Chinese Journal of Lasers, 2020, 47(4): 0402002.
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