引用本文:张渊,雷旻,程晨,张声伟.TC4钛合金表面等离子熔覆Ni60涂层的性能∗[J].中国表面工程,2021,34(2):86~93
Zhang Yuan,Lei Min,Cheng Chen,Zhang Shengwei.Properties of Plasma Cladding Ni60 Coating on TC4 Titanium Alloy Surface[J].China Surface Engineering,2021,34(2):86~93
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TC4钛合金表面等离子熔覆Ni60涂层的性能∗
张渊1,2, 雷旻1,2, 程晨1,2, 张声伟1,2
1.贵州大学材料与冶金学院 贵阳 550025;2.贵州大学贵州省材料结构与强度重点实验室 贵阳 550025
摘要:
以等离子熔覆方式在 TC4 钛合金表面制备 Ni60 熔覆层,通过 X 射线衍射、扫描电镜和显微硬度测试等方法分析 Ni60 熔覆层凝固组织、成分及硬度的关系。 结果表明:在 Ni60 粉末熔覆层中,由基底依次凝固生长柱晶、枝晶、等轴晶和共晶组织, 在柱晶及枝晶主干等部位,Ti 优先选择固溶 N/ O 元素,将其他合金元素排挤到后凝固的等轴晶区,在最后凝固区形成富含 Ni 的共晶组织。 熔覆层中先凝固的柱晶及枝晶区,一次时效(600 ℃ / 1 h)后获得的强化效果最佳;而后凝固的等轴晶区与共晶区,富含多种合金元素,经三次时效后,表面等轴晶区硬度强化效果依次递增,最终硬度可达 800 HV。 与 TC4 钛合金相比, Ni60 熔覆层具有更优异的耐磨性和耐蚀性,三次时效后的 Ni60 涂层磨损失重从 0. 057 4 g 降至 0. 017 1 g ,耐磨性提高约 3 倍。
关键词:  等离子熔覆  TC4 钛合金  Ni60  柱晶  时效
DOI：10.11933/j.issn.1007-9289.20210130002
分类号:TG156;TG146
基金项目:新型高强高韧性渗碳空冷掘进重型钎具产业化推广应用(黔科合成果[2019]4024 号)
Properties of Plasma Cladding Ni60 Coating on TC4 Titanium Alloy Surface
Zhang Yuan1,2, Lei Min1,2, Cheng Chen1,2, Zhang Shengwei1,2
1.College of Materials and Metallurgy, Guizhou University, Guiyang 550025 , China;2.Key Laboratory for Mechanical Behavior and Microstructure of Materials, Guizhou University, Guiyang 550025 , China
Abstract:
Ni60 heat-resistant cladding layer was produced on the surface of TC4 titanium alloy by plasma cladding. X-ray diffraction, scanning electron microscope and micro-hardness test are applied to find out the relation between solidification structure, composition and hardness of Ni60 cladding layer. The results show that columnar crystals, dendrites, equiaxed crystals and eutectic structures are sequentially solidified and grown from the substrate of the Ni60 powder cladding layer. Ti preferentially selects solid solution N/ O ele- ments in the trunk of dendritic and columnar crystals while push other alloying elements into the subsequently solidified equiaxed grain area, and forms a Ni-rich eutectic structure in the final solidification area. The firstly solidified columnar and dendritic zones, in the cladding layer, have the best strengthening effect after one time aging (600 ℃ / 1 h). While equiaxed crystal and eutectic zone, the fi- nal solidification area in the cladding layer, is rich in various alloy elements. The hardness strengthening effect of equiaxed crystal on the surface increases sequentially after three times of aging, and the final hardness can reach 800 HV. Compared with TC4 titanium al- loy, Ni60 cladding layer has better wear resistance and corrosion resistance. After three times of aging, the wear loss of Ni60 coating decreases from 0. 057 4 g to 0. 017 1 g thus the wear resistance is nearly tripled.
Key words:  plasma cladding  TC4 titanium alloy  Ni60  columnar crystal  aging
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