Effect of heat-treatment on microstructural evolution and mechanical behaviour of severely deformed Inconel 718

Yadav, Prabhat Chand; Sahu, Sandeep; Subramaniam, Anandh; Shekhar, Shashank

doi:10.1016/j.msea.2018.01.007

Cited by 31 publications

(10 citation statements)

References 37 publications

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“…This could mean that the remaining precipitates in the aged material deformed at 1100 C impede grain growth to some extent, by pinning of grain boundaries. [6,47] Another possible explanation is related to the total strain. The annealed material being more prone to deformation than the aged one, it accumulates more strain and internal energy (as it is suggested by the stress-strain curves in Figure 7), thus increasing the dislocation density and promoting recrystallization.…”

Section: Influence Of Initial Heat Treatmentmentioning

confidence: 99%

“…[1] It was observed that recrystallization takes place in alloy 718 and other Ni-based alloys during manufacturing processes, for example during hot forging, [2,3] friction welding [4,5] and machining. [6][7][8] The deformation behavior of alloy 718 at low strain rate (below 1 s À1 ) was extensively investigated for a wide range of temperatures. These studies showed and characterized the occurrence of dynamic recrystallization at high temperatures (above 900 C) in this alloy.…”

Section: Introductionmentioning

confidence: 99%

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High Strain Rate Deformation Behavior and Recrystallization of Alloy 718

Moretti

Dalai

Åkerström

et al. 2021

Metall Mater Trans A

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To study the deformation behavior and recrystallization of alloy 718 in annealed and aged state, compression tests were performed using Split-Hopkinson pressure bar (SHPB) at high strain rates (1000 to 3000 s−1), for temperatures between 20 $$^\circ $$ ∘ C and 1100 $$^\circ $$ ∘ C (293 K to 1373 K). Optical microscope (OM) and electron back-scatter diffraction (EBSD) technique were employed to characterize the microstructural evolution of the alloy. The stress–strain curves show that the flow stress level decreases with increasing temperature and decreasing strain rate. In addition, up to 1000 $$^\circ $$ ∘ C, the aged material presents higher strength and is more resistant to deformation than the annealed one, with a yield strength around 200 MPa higher. For both states, dynamic and meta-dynamic recrystallization occurred when the material is deformed at 1000 $$^\circ $$ ∘ C and 1100 $$^\circ $$ ∘ C, leading to a refinement of the microstructure. As necklace structures were identified, discontinuous recrystallization is considered to be the main recrystallization mechanism. The recrystallization kinetics is faster for higher temperatures, as the fraction of recrystallized grains is higher and the average recrystallized grain size is larger after deformation at 1100 $$^\circ $$ ∘ C than after deformation at 1000 $$^\circ $$ ∘ C.

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Section: Influence Of Initial Heat Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High Strain Rate Deformation Behavior and Recrystallization of Alloy 718

Moretti

Dalai

Åkerström

et al. 2021

Metall Mater Trans A

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“…In a number of investigations, the effects of cold deformation on precipitation behavior and subsequent mechanical properties in solution-annealed Alloy 718 have been studied. [3,5,8,11,12,18] This processing route is relevant to a number of components, such as high strength, high-temperature fasteners, [14] and highly stressed parts in petrochemical applications. [5] For instance, Mei et al [3] used differential scanning calorimetry (DSC) to investigate the effects of cold rolling with thickness reductions of up to 70 pct on the precipitation kinetics of various phases in Alloy 718.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cold Rotary Swaging on Microstructure and Uniaxial Mechanical Behavior in Alloy 718

Klumpp

Kauffmann

Seils

et al. 2021

Metall Mater Trans A

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In this study, the influence of cold rotary swaging on microstructure and mechanical properties of the precipitation-strengthened nickel-based superalloy 718 (Alloy 718) was investigated. The initial stages of work-hardening were characterized by means of microhardness, electron backscatter diffraction (EBSD), and X-ray diffraction (XRD) analyses. Furthermore, attention was devoted to the mechanical behavior at ambient and elevated temperature (550 °C) in uniaxial tension and compression. Rotary swaging to different true strains of maximum $$\varphi = 0.91$$ φ = 0.91 caused a moderate increase of microhardness and enhanced markedly the load-bearing capacity in tension, giving rise to yield strength beyond 2000 MPa. The mechanical strength $$R_{p0.2}$$ R p 0.2 in tension subsequent to rotary swaging perfectly correlates with increasing dislocation density $$\rho $$ ρ estimated from XRD in the form of a Taylor-like relationship $$R_{p0.2} \propto \sqrt{\rho }$$ R p 0.2 ∝ ρ . In compression, transient stress–strain evolution without the occurrence of a clear elastic range and distinct yield phenomenon was observed. Restoration of the elastic range, accompanied by a pronounced increase of microhardness, was obtained by a post-swaging tempering treatment at 600 °C.

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“…As a post-treatment process, heat treatment can change the microstructure of the machined surface of a metal material by recrystallization in the hardened area. Yadav et al [7] investigated the effect of heat treatment on the microstructure and mechanical properties of Inconel 718 chips formed in the cutting process. The workpiece was machined and then heat treated at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sequential Operation with Heat Treatment and Mechanical Milling on Work Hardening for Superalloy GH4169

Zhu

Liu

Ren

et al. 2021

Metals

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Engineering components are usually manufactured with sequential production processes. Work hardening due to previous production processes affects the machinability of the workpiece in subsequent operations. In this research, the surface work hardening of a workpiece manufactured by two sequential processes with heat treatment/milling (HT + M) and milling/heat treatment (M + HT) of superalloy GH4169 was investigated. First, the surface microstructure characteristics, including plastic deformation and grain size of the machined workpiece surface processed by the two sequential processes, were quantitatively presented. Then, the microhardness on the machined workpiece surface and its cross-section was measured and analyzed. Finally, a surface microhardness calculation model considering twin boundary deformation was proposed. Here, we also present the microstructure evolution principle of the machined workpiece surface by the two sequential processes. It was found that the degree of work hardening of HT + M machining was 179%, whereas that of M + HT was only 101%. The research results can be applied to the optimized selection of process sequence for manufacturing superalloy GH4169.

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Effect of heat-treatment on microstructural evolution and mechanical behaviour of severely deformed Inconel 718

Cited by 31 publications

References 37 publications

High Strain Rate Deformation Behavior and Recrystallization of Alloy 718

High Strain Rate Deformation Behavior and Recrystallization of Alloy 718

Influence of Cold Rotary Swaging on Microstructure and Uniaxial Mechanical Behavior in Alloy 718

Effects of Sequential Operation with Heat Treatment and Mechanical Milling on Work Hardening for Superalloy GH4169

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