Fatigue Properties of Inconel 625 Alloy Parts Manufactured by Wire Arc Additive Manufacturing Method

مهندسی متالورژی و مواد

Article 11, Volume 32, Issue 2 - Serial Number 24, June 2021, Pages 137-148   

Document Type: Original Articles

DOI: 10.22067/jmme.2021.68429.1005

Authors

Ghasem Pirouzmanesh¹; Mahmood Sharifitabar^{* 2}; Mahdi Shafiee Afarani³

¹University of Sistan and Baluchestan

²Assistant Professor/ University of Sistan and Baluchestan

³Professor/ University of Sistan and Baluchestan

Abstract

In the present study, Inconel 625 alloy walls were fabricated by wire arc additive manufacturing method. Microstructure, hardness, tensile properties at room temperature and 700 ˚C, and high-cycle fatigue strength in both welding and building directions of samples were evaluated. The microstructure of the wall contained dendritic Ni-based solid solution along with MC carbide, Laves, and delta inter-dendritic phases. Moreover, the Vickers hardness value decreased from 380 HV near the substrate to 300 HV in the top layer. Also, yield and tensile strengths along the welding direction were 6.6 and 8.6% higher and the elongation was 23% lower than the building direction, respectively. Furthermore, fatigue test results with the stress ratio of 0.1 showed that the number of cycles to failure was slightly higher in the welding direction. Fractography of the samples illustrated that all fatigue cracks initiated from the surface. This confirmed the soundness of the walls manufactured by this method. 

Keywords

Inconel 625; high-cycle fatigue; Additive manufacturing; high-temperature strength

Supplementary Files

11-sharifitabar.pdf

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