中国激光, 2020, 47 (9): 0902001, 网络出版: 2020-09-16
铌微合金化对光纤激光-CMT复合焊接A7204P-T4 铝合金接头组织和力学性能的影响 
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Effects of Nb Micro-Alloying on Microstructure and Mechanical Properties of A7204P-T4 Aluminum Alloy Joint by Fiber Laser-CMT Hybrid Welding
图 & 表
图 3. 焊缝的横截面形貌。(a)未加铌;(b)铌的质量分数为0.74%;(c)铌的质量分数为1.36%
Fig. 3. Cross-sectional morphologies of welds. (a) Without niobium; (b) niobium with a mass fraction of 0.74%; (c) niobium with a mass fraction of 1.36%
图 4. 焊缝熔合区的显微组织。(a)未加铌,熔合区上部;(b)铌的质量分数为0.74%,熔合区上部;(c)铌的质量分数为1.36%,熔合区上部;(d)未加铌,熔合区下部;(e)铌的质量分数为0.74%,熔合区下部;(f)铌的质量分数为1.36%,熔合区下部
Fig. 4. Microstructures of weld fusion zone. (a) Without niobium, fusion zone upper part; (b) niobium with a mass fraction of 0.74%, fusion zone upper part; (c) niobium with a mass fraction of 1.36%, fusion zone upper part; (d) without niobium, fusion zone bottom part; (e) niobium with a mass fraction of 0.74%, fusion zone bottom part; (f) niobium with a mass fraction of 1.36%, fusion
图 5. 焊缝中心的显微组织。(a)未加铌,焊缝中心上部;(b)铌的质量分数为0.74%,焊缝中心上部;(c)铌的质量分数为1.36%,焊缝中心上部;(d)未加铌,焊缝中心下部;(e)铌的质量分数为0.74%,焊缝中心下部;(f)铌的质量分数为1.36%,焊缝中心下部
Fig. 5. Microstructures of weld center. (a) Without niobium, weld center upper part; (b) niobium with a mass fraction of 0.74%, weld center upper part; (c) niobium with a mass fraction of 1.36%, weld center upper part; (d) without niobium, weld center bottom part; (e) niobium with a mass fraction of 0.74%, weld center bottom part; (f) niobium with a mass fraction of 1.36%, weld center bottom part
图 6. 显微组织的EBSD测试结果以及晶粒统计结果。(a)未加铌,熔合区的EBSD测试结果;(b)未加铌,焊缝中心区的EBSD测试结果;(c)铌的质量分数为0.74%,熔合区的EBSD测试结果;(d)铌的质量分数为0.74%,焊缝中心区的EBSD测试结果;(e)未加铌,熔合区的晶粒统计结果;(f)未加铌,焊缝中心区的晶粒统计结果;(g)铌的质量分数为0.74%,熔合区的晶粒统计结果;(h)铌的质量分数为0.74%,焊缝中心区的晶粒统计结果
Fig. 6. EBSD of microstructures and grain statistical results. (a) Without niobium, EBSD of fusion zone; (b) without niobium, EBSD of weld center; (c) niobium with a mass fraction of 0.74%, EBSD of fusion zone; (d) niobium with a mass fraction of 0.74%, EBSD of weld center; (e) without niobium, grain statistical result of fusion zone; (f) without niobium, grain statistical result of weld center; (g) niobium with a mass fraction of 0.74%, grain statistical result of fusion zone; (h) niobium with a mass f
图 7. 焊缝的SEM背散射照片和析出相的EDS结果。(a)(b)未加铌,熔合区及其局部放大图;(c)铌的质量分数为0.74%,熔合区;(d)(e)铌的质量分数为1.36%,熔合区及其局部放大图;(f)铌元素的EPMA面扫描结果; (g) Al2Mg3Zn3析出相的EDS结果;(h) MgZn2析出相的EDS结果;(i) Al-Nb析出相的EDS结果
Fig. 7. SEM backscattered photos of weld and EDS results of precipitated phases. (a)(b) Without niobium, fusion zone and its partial enlargement; (c) niobium with a mass fraction of 0.74%, fusion zone; (d)(e) niobium with a mass fraction of 1.36%, fusion zone and its partial enlargement; (f) EPMA area scan result of niobium; (g) EDS of Al2Mg3Zn3 precipitated phase; (h) EDS of MgZn2 precipitated phase; (i) EDS of Al-Nb precipitated phase
图 8. 焊缝上部和下部的显微硬度分布。(a)焊缝上部;(b)焊缝下部
Fig. 8. Microhardness distribution of the top and bottom of the weld. (a) Top; (b) bottom
图 10. 拉伸试样的宏观断裂位置以及微观断口形貌。(a)宏观断裂位置;(b)(c)未加铌,微观断口及其局部放大图;(d)(e)铌的质量分数为0.74%,微观断口及其局部放大图;(f)(g)铌的质量分数为1.36%,微观断口及其局部放大图
Fig. 10. Macroscopic fracture position and microscopic fracture of tensile samples. (a) Macro fracture location; (b)(c) without niobium, microscopic fracture and its partial enlargement; (d)(e) niobium with a mass fraction of 0.74%, microscopic fracture and its partial enlargement; (f)(g) niobium with a mass fraction of 1.36%, microscopic fracture and its partial enlargement
表 1A7204P-T4铝合金及焊丝的化学成分
Table1. Chemical composition of A7204P-T4 aluminum alloy and welding wire
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栗忠秀, 温鹏, 张松, 吴世凯. 铌微合金化对光纤激光-CMT复合焊接A7204P-T4 铝合金接头组织和力学性能的影响[J]. 中国激光, 2020, 47(9): 0902001. Li Zhongxiu, Wen Peng, Zhang Song, Wu Shikai. Effects of Nb Micro-Alloying on Microstructure and Mechanical Properties of A7204P-T4 Aluminum Alloy Joint by Fiber Laser-CMT Hybrid Welding[J]. Chinese Journal of Lasers, 2020, 47(9): 0902001.
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