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Effects of Process Parameters on Geometrical Characteristics and Microstructure of TiC Particle-Reinforced Co50 Alloy by Laser Cladding
Advances in Materials Science and Engineering ( IF 2.098 ) Pub Date : 2021-03-05 , DOI: 10.1155/2021/8898693
Nga Pham Thi-Hong 1
Affiliation  

Laser cladding of Co50 alloy coating and Co50 composite coatings doped with 10, 20, and 30 wt.% TiC particles was performed on the H13 steel surface. The effects of TiC concentration on the phase composition, microstructure, and microhardness of the coatings were studied. The results indicated that, in 10% TiC coating, the “bright band” is a quite flat-growth tissue, while with 20% TiC, the “white bright band” contains a large amount of black TiC particles. The composite coating Co50, 10% TiC, and 20% TiC samples can clearly distinguish the cladding zone, bonding zone, and heat-affected zone, and a good metallurgical bond is formed between the coating and the substrate. The 30% TiC coating and the substrate are not well bonded, which is attributed to the high TiC content in the coating; however, it has the best surface morphology, and there is no porosity on the surface. 10% TiC coatings have poor surface quality, show a spraying material phenomenon on two side edges which is quite serious, and a lot of porosity on the surface of the coating. In addition, 10% TiC coating includes the original TiC particles and primary TiC particles that are precipitated in situ from the liquid phase during solidification; 20% TiC coating indicates a large amount of TiC in the form of cross petals and twigs, and the figure points out that TiC exists like a large number of diffusely distributed spherical structures in the 30% TiC coating. The coatings of TiC/Co composite with less than 20% TiC showed good metallurgical bonding characteristics with the H13 steel surface.

中文翻译:

工艺参数对激光熔覆TiC颗粒增强Co50合金几何特性和组织的影响

在H13钢表面上进行了掺有10%,20%和30%(重量)的TiC颗粒的Co50合金涂层和Co50复合涂层的激光熔覆。研究了TiC浓度对涂层的相组成,显微组织和显微硬度的影响。结果表明,在10%TiC涂层中,“亮带”是相当平坦的组织,而在20%TiC下,“白色亮带”包含大量的黑色TiC颗粒。复合涂层Co50、10%TiC和20%TiC样品可以清楚地区分包覆层,结合区和热影响区,并且在涂层和基材之间形成了良好的冶金结合。TiC含量为30%的涂层与基材之间的粘合性不佳,这归因于涂层中TiC含量高。但是,它具有最佳的表面形态,而且表面没有孔隙。10%TiC涂层的表面质量较差,在两侧边缘均显示喷涂材料现象,这非常严重,并且涂层表面有很多孔隙。此外,10%的TiC涂层包括原始TiC颗粒和一次TiC颗粒,它们在凝固过程中从液相中就地沉淀出来。20%的TiC涂层表示大量的TiC以交叉花瓣和细枝的形式出现,并且该图指出,在30%的TiC涂层中,TiC像大量分散分布的球形结构一样存在。TiC / Co复合材料的TiC含量低于20%时,与H13钢表面表现出良好的冶金结合特性。在两个侧边缘上显示喷涂材料现象,这是相当严重的,并且涂层表面上有很多孔隙。另外,10%TiC涂层包括原始TiC颗粒和一次TiC颗粒,它们在凝固过程中从液相中原位沉淀出来;20%的TiC涂层表示大量的TiC以交叉花瓣和细枝的形式出现,并且该图指出,在30%的TiC涂层中,TiC像大量分散分布的球形结构一样存在。TiC / Co复合材料的TiC含量低于20%时,与H13钢表面表现出良好的冶金结合特性。在两个侧边缘上显示喷涂材料现象,这是相当严重的,并且涂层表面上有很多孔隙。另外,10%TiC涂层包括原始TiC颗粒和一次TiC颗粒,它们在凝固过程中从液相中原位沉淀出来;20%的TiC涂层表示大量的TiC以交叉花瓣和细枝的形式出现,并且该图指出,在30%的TiC涂层中,TiC像大量分散分布的球形结构一样存在。TiC / Co复合材料的TiC含量低于20%时,与H13钢表面表现出良好的冶金结合特性。10%TiC涂层包括原始TiC颗粒和一次TiC颗粒,它们在凝固过程中从液相中就地沉淀出来;20%的TiC涂层表示大量的TiC以交叉花瓣和细枝的形式出现,并且该图指出,在30%的TiC涂层中,TiC像大量分散分布的球形结构一样存在。TiC / Co复合材料的TiC含量低于20%时,与H13钢表面表现出良好的冶金结合特性。10%TiC涂层包括原始TiC颗粒和一次TiC颗粒,它们在凝固过程中从液相中就地沉淀出来;20%的TiC涂层表示大量的TiC以交叉花瓣和细枝的形式出现,并且该图指出,在30%的TiC涂层中,TiC像大量分散分布的球形结构一样存在。TiC / Co复合材料的TiC含量低于20%时,与H13钢表面表现出良好的冶金结合特性。
更新日期:2021-03-05
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