The effect of microstructure and welding-induced plasticity on the strength of Ni–Mo–Cr alloy welds
No Thumbnail Available
Date
2021-06
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
The mechanical performance of a Ni–Mo–Cr (GH3535) alloy weldment, produced using a matching filler metal, was assessed and compared to the surrounding parent metal. Ambient-temperature mechanical characterisation included hardness testing, small punch testing and uniaxial tensile testing, while a crystal plasticity finite element model was used to assess the impact of crystallographic texture on the mechanical properties. Despite the similar chemical composition, the weld metal exhibited superior strength and ductility to that of the parent metal. The higher strength was primarily attributed to the high dislocation density in the weld metal imbued by the welding-induced thermo-mechanical loading. In contrast, the ductility difference was attributed to M6C carbide stringers in the parent metal that initiated fracture at lower strains when compared to the weld metal, with the latter containing finer, well-dispersed M6C carbides. © 2021 Acta Materialia Inc. Published by Elsevier B.V.
Description
Keywords
Microstructure, Welding, Plasticity, Alloys, Mechanical properties, Finite element method
Citation
Danon, A. E., Muránsky, O., Zhu, H., Wei, T., Flores-Johnson, E. A., Li, Z. J., & Kruzic, J. J. (2021). The effect of microstructure and welding-induced plasticity on the strength of Ni–Mo–Cr alloy welds. Materialia, 17, 101126. doi:10.1016/j.mtla.2021.101126