电磁复合场对Ni60激光熔覆层表面裂纹与组织结构的影响
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摘要
在激光熔覆Ni60合金过程中极易出现脆性相含量高等缺陷而导致熔覆层表面开裂。通过在激光熔覆过程中施加电磁复合场装置,利用电磁复合场辅助激光熔覆来抑制Ni60合金熔覆层表面开裂。结果表明:在送粉量较低的条件下引入电磁复合场,能有效抑制熔覆层表面开裂;当送粉量较高时,无法抑制熔覆层表面开裂。在施加电磁复合场的前、后,随着送粉量的提高,熔覆层内类柱状晶与树枝晶数量都增多;但施加电磁复合场后,熔覆层内的脆性相数量有所降低,这可能是Ni60合金熔覆层表面裂纹被抑制的关键原因。
The cracking of the cladding surface is prone to occur due to the high content of the brittle phase during the Ni60 alloy laser cladding process. The compound use of electric and magnetic fields is proposed for laser cladding process. The cracks of Ni60 alloy coating are effectively suppressed by the synergistic effect of the electromagnetic compound field. The results show that the surface cracking of Ni60 alloy laser cladding layer can be effectively suppressed by introducing electromagnetic composite field under the condition of low feed rate. However,when the amount of powder feeding is high,the surface cracks of the cladding layer cannot be suppressed. The number of columnar crystals and dendrites in the cladding layer increases with the increase of the powder feeding amount. But the amount of brittle phase within the cladding layer is reduced after the application of the electromagnetic composite field. This may be the key reason for the inhibition of surface cracks in Ni60 alloy cladding.
The cracking of the cladding surface is prone to occur due to the high content of the brittle phase during the Ni60 alloy laser cladding process. The compound use of electric and magnetic fields is proposed for laser cladding process. The cracks of Ni60 alloy coating are effectively suppressed by the synergistic effect of the electromagnetic compound field. The results show that the surface cracking of Ni60 alloy laser cladding layer can be effectively suppressed by introducing electromagnetic composite field under the condition of low feed rate. However,when the amount of powder feeding is high,the surface cracks of the cladding layer cannot be suppressed. The number of columnar crystals and dendrites in the cladding layer increases with the increase of the powder feeding amount. But the amount of brittle phase within the cladding layer is reduced after the application of the electromagnetic composite field. This may be the key reason for the inhibition of surface cracks in Ni60 alloy cladding.
引文
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[2]YAO Jianhua,YANG Lijing,LI Bo,et al.Beneficial effects of laser irradiation on the deposition process of diamond/Ni60 composite coating with cold spray[J].Applied Surface Science,2015,330:300-308.
[3]杨理京,李祉宏,李波,等.超音速激光沉积法制备Ni60涂层的显微组织及沉积机理[J].中国激光,2015,42(3):0306005-1.
[4]WEN Z H,BAI Y,YANG J F,et al.Effect of vacuum remelting on the solid particles erosion behavior of Ni60-Ni Cr Mo Y composite coatings prepared by plasma spraying[J].Vacuum,2016,134:73-82.
[5]张健,谇小军,胡玉,等.高功率光纤激光器熔覆合金的显微组织及高温摩擦磨损特性[J].中国有色金属学报,2014,24(6):1441-1448.
[6]LU Xiaolong,LIU Xiubo,YU Pengcheng,et al.Synthesis and characterization of Ni60-h BN high temperature selflubricating anti-wear composite coatings on Ti6Al4V alloy by laser cladding[J].Optics and Laser Technology,2016,78(B):87-94.
[7]ZHANG Jian,HU Yu,TAN Xiaojun,et al.Microstructure and high temperature tribological behavior of laser cladding Ni60A alloys coatings on 45 steel substrate[J].Transactions of Nonferrous Metals Society of China,2015,25(5):1525-1532.
[8]SHU Da,LI Zhuguo,ZHANG Ke,et al.In situ synthesized high volume fraction WC reinforced Ni-based coating by laser cladding[J].Materials Letters,2017,195:178-181.
[9]WANG Liang,YAO Jianhua,HU Yong,et al.Influence of electric-magnetic compound field on the WC particles distribution in laser melt injection[J].Surface and Coatings Technology,2017,315:32-43.
[10]WANG Liang,YAO Jianhua,HU Yong,et al.Suppression effect of a steady magnetic field on molten pool during laser remelting[J].Applied Surface Science,2015,351:794-802.