Grinding characteristics of laser cladding Cr3C2/Ni based composite coating

被引：0

作者：

Dai Q. ^{[1
]}

Zhang J. ^{[1
]}

You F. ^{[1
]}

机构：

[1] College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, 361021, Fujian

来源：

Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | 2019年 / 51卷 / 01期

关键词：

Cr[!sub]3[!/sub]C[!sub]2[!/sub]/Ni based coating; Grinding characteristics; Grinding mechanism; Laser cladding; Surface roughness;

D O I：

10.11918/j.issn.0367-6234.201712050

中图分类号：

学科分类号：

摘要：

To study the effects of different grinding parameters, different mass fraction and sizes of Cr3C2 on ground surface quality of the laser cladding Cr3C2/Ni based composite coating, as well as to explore the grinding characteristics and the generation mechanism of the ground surface defects, the grinding experiment was conducted by using CBN grinding wheel, and the results show that the defects on the ground surface of laser cladding Cr3C2/Ni based composite coating mainly include two categories: one is generated in the Ni based alloy which includes debris adherence, grinding traces, micro-crack and cracks; the other is the broken Cr3C2 particles and voids generated by the pullout of the broken Cr3C2. The debris adherence in the Ni based alloy is easier to form under the condition of smaller depth of cut and lower Cr3C2 mass fraction in the coating. As the cutting depth increases, deeper grinding marks and micro-crack appear. The cracks form in the Ni based alloy when the mass fraction of Cr3C2 in the coating is higher than 20%. More voids are found on the ground surface when the mass fraction of Cr3C2 is 30%. Under the same grinding parameters, the Ra value of ground coating increases with the increase of the size of Cr3C2 particles and decreases with the increase of mass fraction of Cr3C2. However, the Ra value increases slightly when the mass fraction of Cr3C2 exceeds 20%. The experimental results reveal that there are fewer defects on the ground surface when the size of Cr3C2 is smaller and the wheel speed is higher. © 2019, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.

引用

页码：122 / 126

页数：4

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