Some aspects over the quality of thin films deposited on special steels used in hydraulic blades

7th International Conference on Advanced Concepts in Mechanical Engineering

Tugui, C.A.^1,2 ; Vizureanu, P.^1 ; Iftimie, N.^2 ; Steigmann, R.^2

Tehnical University Gh. Asachi Iasi, Faculty of Science and Materials Engineering, 59 D.Mangeron Blvd., Iasi

700050, Romania^1

National Institute of Research and Development for Technical Physics, Nondestructive Testing Department, 47 D.Mangeron Blvd., Iasi

700050, Romania^2

关键词: Electrospark deposition;    Experimental research;    Hard thin films;    High-quality films;    Hydraulic turbine blade;    Metallic support;    Non destructive testing;    Optical methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/147/1/012040/pdf
DOI  :  10.1088/1757-899X/147/1/012040

来源: IOP

【 摘 要 】

The experimental research involved in this paper consists in the obtaining of superior physical, chemical and mechanical properties of stainless steels used in the construction of hydraulic turbine blades. These properties are obtained by deposition of hard thin films in order to improve the wear resistance, increasing the hardness but maintaining the tenacious core of the material. The chosen methods for deposition are electrospark deposition because it has relatively low costs, are easy to obtain, the layers have a good adherence to support and the thickness can be variable in function of the established conditions and the pulsed laser deposition because high quality films can be obtained at nanometric precision. The samples will be prepared for the analysis of the structure using optical method as well as for the obtaining of the optimal roughness for the deposition. The physical, chemical and mechanical properties will be determined after deposition using SEM and EDX, in order to emphasize the structure film-substrate and repartition of the deposition elements on the surface and in transversal section. The non-destructive testing has emphasized the good adherence between deposited layer and the metallic support, due to double deposition, spallation regions doesn't appear.