Influence of chemical composition of initial powders on structure and properties of ''Ti_Ta_Zr'' coatings fabricated on cp_titanium substrates by electron beam cladding

20th International Conference for Students and Young Scientists: Modern Techniques and Technologies

工业技术;材料科学

Samoylenko, V.V.^1 ; Lazurenko, D.V.^1 ; Lenivtseva, O.G.^1 ; Polyakov, I.A.^1

Material Science in Mechanical Engineering Department, Novosibirsk State Technical University, 20 Prospekt K.Marksa, Novosibirsk

630073, Russia^1

关键词: Chemical compositions;    Dendritic structures;    Electron beam claddings;    Electron-beam treatment;    High quality coatings;    Needle-like structure;    Structural transformation;    Structure and properties;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/66/1/012026/pdf
DOI  :  10.1088/1757-899X/66/1/012026

来源: IOP

【 摘 要 】

In this study Ti-Ta-Zr corrosion resistant coatings fabricated by electron beam treatment of Ti substrates were investigated. The series of experiments on varying Ta and Zr concentrations in initial powder mixtures aimed on identifying influence of the alloying components ratio on structure and properties of coatings were carried out. It was found that during the electron beam cladding the high-quality coatings with a dendritic structure exhibited uneven distribution of alloying components in a cross section were formed. Moreover scanning electron microscopy (SEM) revealed the formation of needlelike structure. However difference in Ta and Zr concentrations in initial powder mixtures did not cause significant structural transformations in the coatings. Meanwhile the direct dependence between microhardness of the surface layers and Zr content in it was revealed. The maximal microhardness level was detected in the coating containing 60 % Zr. The impact strength test indicated decrease of impact toughness of titanium samples after cladding by a factor of 1.5...2.