中国激光, 2018, 45 (6): 0602005, 网络出版: 2018-07-05
38MnVS6钢中硫元素扩散对激光熔覆涂层形貌和组织的影响 
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Effect of Sulfur Diffusion in 38MnVS6 Steel on Morphology and Microstructure of Laser Cladding Layers
图 & 表
图 1. 激光熔覆实验装置。(a)加工系统;(b)加工头
Fig. 1. Experimental setup of laser cladding. (a) Processing system; (b) processing head
图 2. 不同扫描速度下涂层的横截面形貌。(a) 2 mm·s-1;(b) 3 mm·s-1;(c) 4 mm·s-1;(d) 5 mm·s-1;(e) 6 mm·s-1;(f) 7 mm·s-1;(g) 8 mm·s-1;(h) 9 mm·s-1
Fig. 2. Cross-sectional morphologies of cladding layers under different scanning speeds. (a) 2 mm·s-1;(b) 3 mm·s-1; (c) 4 mm·s-1; (d) 5 mm·s-1; (e) 6 mm·s-1; (f) 7 mm·s-1; (g) 8 mm·s-1; (h) 9 mm·s-1
图 3. 不同扫描速度下涂层的稀释率
Fig. 3. Dilution rates of cladding layers under different scanning speeds
图 4. 不同送粉率下涂层的横截面形貌。(a) 1.80 g·min-1;(b) 3.13 g·min-1;(c) 4.37 g·min-1;(d) 5.60 g·min-1;(e) 6.93 g·min-1;(f) 8.17 g·min-1;(g) 9.40 g·min-1
Fig. 4. Cross-sectional morphologies of cladding layers under different powder feeding rates. (a) 1.80 g·min-1;(b) 3.13 g·min-1; (c) 4.37 g·min-1; (d) 5.60 g·min-1; (e) 6.93 g·min-1; (f) 8.17 g·min-1; (g) 9.40 g·min-1
图 5. 不同扫描速度下涂层中沿深度方向的硫元素分布
Fig. 5. Content of sulfur element distribution along depth direction of cladding layer under different scanning speeds
图 7. 激光熔覆中马兰戈尼对流方向示意图。(a)向外流动;(b)向内流动
Fig. 7. Schematic of direction of Marangoni convection in laser cladding. (a) Outward flow; (b) inward flow
图 8. 不同扫描速度下涂层沿深度方向主要元素的分布。(a) 4 mm·s-1;(b) 5 mm·s-1;(c) 6 mm·s-1
Fig. 8. Distributions of main elements along depth direction of cladding layer under different scanning speeds. (a) 4 mm·s-1; (b) 5 mm·s-1; (c) 6 mm·s-1
图 9. 熔池形貌和凝固前沿示意图。(a)内流型熔池;(b)外流型熔池
Fig. 9. Schematics of molten pool morphology and solidification front. (a) Molten pool with inward flow; (b) molten pool with outward flow
图 10. 涂层的显微组织。(a)内流型熔池,横截面;(b)内流型熔池,顶部;(c)内流型熔池,底部;(d)外流型熔池,横截面;(e)外流型熔池,顶部;(f)外流型熔池,底部
Fig. 10. Microstructures of cladding layer. (a) Molten pool with inward flow, cross-section; (b) molten pool with inward flow, top region; (c) molten pool with inward flow, bottom region; (d) molten pool with outward flow, cross-section; (e) molten pool with outward flow, top region; (f) molten pool with outward flow, bottom region
表 1基体和熔覆粉末的化学成分(质量分数,%)
Table1. Chemical compositions of substrate and cladding powder (mass fraction, %)
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陈茹, 虞钢, 何秀丽, 甘政涛, 李少霞. 38MnVS6钢中硫元素扩散对激光熔覆涂层形貌和组织的影响[J]. 中国激光, 2018, 45(6): 0602005. Ru Chen, Gang Yu, Xiuli He, Zhengtao Gan, Shaoxia Li. Effect of Sulfur Diffusion in 38MnVS6 Steel on Morphology and Microstructure of Laser Cladding Layers[J]. Chinese Journal of Lasers, 2018, 45(6): 0602005.
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