| 引用本文: | 戴秋莲,张杰,尤芳怡.激光熔覆Cr3C2/Ni基复合涂层的磨削特性[J].哈尔滨工业大学学报,2019,51(1):122.DOI:10.11918/j.issn.0367-6234.201712050 |
| DAI Qiulian,ZHANG Jie,YOU Fangyi.Grinding characteristics of laser cladding Cr3C2/Ni based composite coating[J].Journal of Harbin Institute of Technology,2019,51(1):122.DOI:10.11918/j.issn.0367-6234.201712050 |
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| 摘要: |
| 为研究不同磨削参数、不同质量分数及粒度的Cr3C2对激光熔覆Cr3C2/Ni基复合涂层磨削表面质量的影响规律,探究其磨削特征及磨削表面缺陷的形成机理,采用CBN砂轮对激光熔覆Cr3C2/Ni复合涂层进行磨削实验. 实验结果表明:Cr3C2/Ni基复合涂层磨削表面的加工缺陷主要产生于Ni合金基体中形成的堆积、犁沟、局部崩碎、裂纹,以及破碎的Cr3C2颗粒和由于破碎的Cr3C2脱落、被压碎的Cr3C2颗粒产生的表面凹坑等. 在较小的切深和较低质量分数的Cr3C2条件下,Ni合金基体中较容易形成堆积；随着切深的增加,Ni合金基体中的犁沟加深,局部出现崩碎；当涂层中的Cr3C2质量分数高于20 %时,Ni合金基体中甚至出现裂纹；涂层中Cr3C2质量分数达到30 %时,磨削表面出现较多破碎的Cr3C2和凹坑. 在相同的磨削参数下,涂层磨削表面粗糙度随着熔覆层中Cr3C2粒径的增大而增大,随着Cr3C2质量分数的增加而降低,但Cr3C2质量分数超过20 %时,涂层的粗糙度反而略有上升. 减小Cr3C2的粒径和提高砂轮的线速度可以减少涂层磨削缺陷的产生. |
| 关键词: 激光熔覆 磨削特征 磨削机理 表面粗糙度 Cr3C2/Ni基涂层 |
| DOI：10.11918/j.issn.0367-6234.201712050 |
| 分类号:TG58 |
| 文献标识码:A |
| 基金项目: |
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| Grinding characteristics of laser cladding Cr3C2/Ni based composite coating |
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DAI Qiulian,ZHANG Jie,YOU Fangyi
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(College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, Fujian,China)
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| Abstract: |
| 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. |
| Key words: laser cladding grinding characteristics grinding mechanism surface roughness Cr3C2/Ni based coating |
