Study of Mechanical Behavior and X-Ray Elastic Constants of Nickel Alloy Weld Overlay

• Published in: Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2019-01, Vol.22 (4), p.1
• Main Authors: Monine, Vladimir Ivanovitch, Gonzaga, Rodrigo Stohler, Farias, Francisco Werley Cipriano, Passos, Elisa Kimus Dias, Payão Filho, João da Cruz
• Format: Article
• Language: English
• Subjects: EBSD analysis; Elastic properties; Electron backscatter diffraction; Electrons; ENGINEERING, CHEMICAL; Machining; MATERIALS SCIENCE, MULTIDISCIPLINARY; Mechanical properties; METALLURGY & METALLURGICAL ENGINEERING; Microstructure; Modulus of elasticity; Nickel; Nickel alloy weld overlay; Nickel base alloys; Poisson's ratio; Superalloys; Vickers hardness; X-ray diffraction; X-ray elastic constants
• ISSN: 1516-1439; 1980-5373; 1980-5373
• DOI: 10.1590/1980-5373-mr-2018-0719

The study of nickel-based alloy 625 clad (weld overlay) by X-ray diffraction (XRD) is difficult and often impossible because of its coarse and anisotropic microstructure. In this work, a sample preparation including machining, grinding, and annealing was proposed to avoid this negative effect in XRD analysis. Electron backscatter diffraction and hardness testing were used to evaluate the microstructure of the surface and the inner region of a sample during its preparation. The proposed sample preparation allowed accurate determination of the Young's modulus and the Poisson ratio through XRD. The values obtained using a small bending fixture are 212 ± 2 GPa and 0.31 ± 0.01, respectively.