Characteristics of dilution and microstructure in laser cladding Ni-Cr-B-Si coating assisted by electromagnetic compound field

Characteristics of dilution and microstructure in laser cladding Ni-Cr-B-Si coating assisted by electromagnetic compound field
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电磁复合场辅助激光熔覆Ni-Cr-B-Si涂层稀释及显微组织特征

DOI:
10.1016/j.matlet.2019.01.133
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发表时间:
2019-05
期刊:
影响因子:
3
通讯作者:
Xiaoyan Yao
Xiaoyan Yao
中科院分区:
材料科学3区
文献类型:
--
作者:
Lulu Zhai;Chunyan Ban;Junwei Zhang;Xiaoyan Yao

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采用电磁场辅助激光熔覆技术在纯铁表面制备了Ni-Cr-B-Si涂层。研究了电磁场对合金的截面形貌、显微组织和元素分布的影响。结果表明,在电磁场作用下,涂层的稀释率降低,碳化铬颗粒细化。涂层中铬硼化物的体积分数增加,相的分布形态与晶界润湿性有关。随着电磁力的增大,涂层底部的柱状树枝晶长度减小。
Ni-Cr-B-Si coatings were prepared on the surface of pure iron using an electromagnetic field assisted laser cladding technique. The effect of electromagnetic field on the cross-sectional morphology, the microstructure and the element distribution was investigated. The results showed that the dilution rate of coatings reduced and the grain size of Cr borides was refined under the electromagnetic field. The volume fraction of Cr borides in the coatings increased and the distribution morphology of phases is related to grain boundary wettability. The length of columnar dendrite crystals at the bottom of the coatings decreased with the increase of the electromagnetic force.
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