激光与光电子学进展, 2019, 56 (11): 111401, 网络出版: 2019-06-13
激光熔覆Ni基合金裂纹的形成机理及敏感性 下载: 1081次
Formation Mechanism and Sensitivity of Cracks in Laser-Cladded Ni-Based-Alloy Coatings
图 & 表
图 2. 熔覆层截面硬度分布
Fig. 2. Microhardness distribution in cross section of Ni-based-alloy coating
图 3. 激光熔覆Ni基合金涂层表面裂纹宏观特征。(a) 2.8 kW;(b) 3.2 kW;(a) 3.6 kW;(a) 4.0 kW
Fig. 3. Macro-morphologies of cracks in laser cladded Ni-based-alloy coatings. (a) 2.8 kW; (b) 3.2 kW; (c) 3.6 kW; (d) 4.0 kW
图 4. 熔覆层截面显微组织及裂纹微观形貌。(a)整体形貌;(b)微观组织和形貌;(c)粗裂纹;(d)微裂纹
Fig. 4. Microstructure of cross-section of Ni-based-alloy coating and crack micro-morphology. (a) Overall morpholog; (b) morphology and microstructure of cross-section; (c) coarse crack; (d) microcrack
图 5. 熔覆层裂纹断口形貌。(a)断面整体形貌;(b)断面河流状花样;(c)(d)断面撕裂棱
Fig. 5. Fracture morphology of crack in laser cladded Ni-based-alloy coating. (a) Overall fracture morphology; (b) river pattern of fracture surface; (c)(d)tearing ridge of fracture surface
图 6. 熔覆层裂纹SEM形貌及周边元素分布。(a) SEM形貌;(b) Ni;(c) Cr;(d) Fe;(e) B;(f) C
Fig. 6. SEM morphology of crack and element distribution in laser cladded Ni-based-alloy coating. (a) SEM morphology; (b) Ni; (c) Cr; (d) Fe; (e) B; (f) C
图 7. 激光熔覆工艺因素对裂纹敏感性的影响(图中标尺均为10 mm)。(a)激光功率(V=10 mm/s,Q=25.9 g/min,T=100 ℃);(b)送粉速率(P=2.8 kW,V=10 mm/s,T=100 ℃);(c)扫描速度(P=4.0 kW,Q=25.9 g/min,T=100 ℃);(d)预热温度(P=2.8 kW,Q=22.7 g/min,V=10 mm/s)
Fig. 7. Effects of laser cladding process factors on cracking sensitivity (The rulers represent 10 mm). (a) Laser power (V=10 mm/s, Q=25.9 g/min, and T=100 ℃); (b) powder feeding rate (P=2.8 kW, V=10 mm/s, and T=100 ℃); (c) scanning speed (P=4.0 kW, Q=25.9 g/min, and T=100 ℃); (d) preheating temperature (P=2.8 kW, Q=22.7 g/min, and V=10 mm/s)
表 1合金粉末和基材成分(质量分数,%)
Table1. Chemical compositions of alloy powder and base material (mass fraction, %)
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表 2EDS成分分析(质量分数,%)
Table2. Compositional analysis by EDS (mass fraction, %)
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张磊, 陈小明, 刘伟, 姜志鹏, 赵鹏, 刘德有. 激光熔覆Ni基合金裂纹的形成机理及敏感性[J]. 激光与光电子学进展, 2019, 56(11): 111401. Lei Zhang, Xiaoming Chen, Wei Liu, Zhipeng Jiang, Peng Zhao, Deyou Liu. Formation Mechanism and Sensitivity of Cracks in Laser-Cladded Ni-Based-Alloy Coatings[J]. Laser & Optoelectronics Progress, 2019, 56(11): 111401.