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.
出处
《电加工与模具》
2018年第1期37-40,共4页
Electromachining & Mould
基金
国家自然科学基金资助项目(51475429)
中国博士后科学基金资助项目(2017M610376)
关键词
电磁复合场
激光熔覆
NI60
裂纹
显微组织
electric-magnetic compound field
laser cladding
Ni60
crack
microstructure
