Solidification and segregation characteristics of Ni-based superalloy C700R-1 for ultra-supercritical steam turbine rotor

Microstructure, Mechanical Properties and Corrosion Behavior of Inconel 617 Superalloy Fabricated by Wire Arc Additive Manufacturing

This study analyzes the effects of Post Weld Heat Treatment (PWHT) on the mechanical properties and microstructure of Inconel 617 weldments produced by the Activated Tungsten Inert Gas (A-TIG) welding and Tungsten Inert Gas (TIG) welding. The TIG weld joints considered for this study were in an as-welded condition and underwent two different conditions of heat treatment including 1050∘C for 3 and 5[Formula: see text]h, respectively. The A-TIG weld joints studied were the as-welded type and the weldment was heat-treated at 1050∘C for 3[Formula: see text]h. The microstructure and the characterization of mechanical properties were performed for all weldments and a comparative assessment was made. Tensile strength and the hardness of the heat-treated samples were considerably higher than that of the as-welded samples. Impact toughness was slightly reduced after PWHT. Improvement in tensile strength could be attributed to the precipitation of the carbides and segregation of Chromium (Cr) and molybdenum (Mo).

Study on the impact of post weld heat treatment on tig and a-tig inconel 617 weldments

A laser-welded Inconel 617 superalloy was thermally exposed at 750 °C for up to 7000 h. It was found that carbides (M23C6, M6C-type Ti(C,N)), topological close-packed (TCP) μ phase and γ' phase (Ni3Al) were formed in the laser welds of Inconel 617 during thermal exposure. The spherical γ' phase in laser-welded Inconel 617 coarsens due to Ostwald ripening, while it shows better thermal stability under long-term exposure at 750 °C. The relationship between the carbides (the globular M6C, the short rod-like M6C and the block-shaped M23C6 carbide) and the matrix γ is a cube-on-cube orientation, while the relationship between the long rod-like M6C carbide and matrix γ is a noncoherent orientation. An increase in the volume fraction and average diameter of the M23C6 and M6C carbides is controlled by the diffusion of C, Cr and Mo atoms. The precipitation of the block-shaped Mo-rich μ phase is promoted in the carbon-depleted region around the M6C carbide by the segregation of Co and Mo. The mass precipitation of the γ' phase, M6C carbide and M23C6 carbide results in an increase in the hardness and a significant drop in the impact toughness of the exposed welded metals after 7000 h of exposure.

Thermal Exposure Effect on the Microstructural and Mechanical Properties of a Laser-Welded Inconel 617 Joint in an Air Environment

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Thermal Exposure Effect on the Microstructural and Mechanical Properties of a Laser-Welded Inconel 617 Joint in an Air Environment