High-cycle Fatigue Properties of Alloy718 Base Metal and Electron Beam Welded Joint

Ono, Yumie; Yuri, Tetsumi; Nagashima, Nobuo; Sumiyoshi, Hideshi; Ogata, Tetsuya; Nagao, Naoki

doi:10.1016/j.phpro.2015.06.196

Cited by 24 publications

(4 citation statements)

References 14 publications

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“…Metals 2019, 9,13 2 of 14 by the United States in the 1950s [1]. In the aging treatment process, the γ" phase, which is coherent with the matrix γ phase (Ni 3 Nb, body-centered tetragonal DO 22 structure), and the γ' phase, which is semicoherent with the γ phase (face-centered cubic LI 2 structure), disperses precipitation and hinders dislocation motion, not only giving the Inconel 718 alloy a higher room temperature strength but also allowing this alloy to maintain a comparatively high strength at high temperatures under 650 • C. Thus, this alloy is widely used in the manufacture of turbine discs and blades for aircraft engines and other key parts and components exposed to high temperatures and fasteners not exposed to high temperatures.…”

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confidence: 99%

“…Therefore, the research on fatigue performance of the Inconel 718 alloy has been widely concerned. According to the specific service environment temperature and load of the parts, it can be roughly divided into several aspects: high temperature [2]/medium temperature [3]/room temperature [4,5] low cycle fatigue, high temperature [6,7]/room temperature [8]/low temperature [9,10] high cycle fatigue, and ultra-high cycle fatigue [11,12] performance. Fournier et al [13] found that the Inconel 718 alloy in the solution treated and aged (ST + A) state had cyclic softening while in the direct aged (DA) state [14] had cyclic hardening under high temperature.…”

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High Cycle Fatigue Performance of Inconel 718 Alloys with Different Strengths at Room Temperature

Liqiong

Liang

et al. 2018

Metals

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In this paper, the high cycle fatigue performance of solid solution state and aged Inconel 718 superalloys was studied at room temperature. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyze the original structural features and fatigue deformation features of two kinds of alloys. SEM, laser scanning confocal microscopy, and electron backscatter diffraction (EBSD) were used to analyze the secondary fracture features of the fatigue fracture morphology and fatigue fracture profile. The results showed that the aging treatment significantly affected the strength and plasticity of the alloy, which in turn affected the fatigue performance of the alloy. After the aging treatment, the yield strength σ s and the tensile strength σ b of the Inconel 718 alloy increased by 152% and 65.9%, respectively, compared with those of the solid solution state, but the rate of elongation δ and rate of contraction in the cross-section area ϕ decreased by 63.7% and 52.3%, respectively. The fatigue limit of the aged state was lower than that of the solid solution state by 6.3%. The quadratic function relationship between the high cycle fatigue limit σ −1 and the tensile strength σ b of the Inconel 718 superalloy at room temperature was σ −1 = σ b · (0.869−3.67 × 10 −4 · σ b ). An analysis of the fatigue fracture mechanism showed that the fatigue fractures before and after aging were all initiated in the grains oriented relatively unfavorably on the surface of the sample, with a mixture of intergranular and transgranular propagation after the transgranular propagation of several grains. The higher plasticity of the solid solution state Inconel 718 alloy resulted in a large number of slip deformation zones under high cycle fatigue loads, and the plastic deformation was relatively uniform. The lengths of the secondary fractures were as high as 120 µm, which formed the single-source plastic fatigue fracture that promoted an increase in the fatigue limit. After aging treatment, the higher strength of the Inconel 718 alloy made dislocation slip difficult under high cycle fatigue loads, and the plasticity compatible deformation capability was poor. When local dislocations slipped to the intragranular γ" phase, γ' phase, or interfaces with nonmetallic compounds (NMCs), plugging occurred. The degree of stress concentration increased, causing the initiation of fatigue fracture; the secondary fracture was approximately 20 µm. Brittle cleavage due to multiple sources significantly reduced the fatigue limit.

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High Cycle Fatigue Performance of Inconel 718 Alloys with Different Strengths at Room Temperature

Liqiong

Liang

et al. 2018

Metals

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“…Ono et al [28] found that the HCF strength of an electron beam welded IN718 joint was lower than the base metal, with cracks occurring in the heat-affected zone. The fatigue crack initiation was attributed to the NbC, Laves and δ phases.…”

Section: Introductionmentioning

confidence: 99%

Additive manufacturing-based repair of IN718 superalloy and high-cycle fatigue assessment of the joint

Sarkar¹,

Chen²,

Fitzpatrick³

et al. 2022

Additive Manufacturing

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“…Одним из направлений повышения качества сварных швов сплавов на никелевой основе является термическая обработка изделия [22][23][24].…”

Section: Introductionunclassified

Study into the effect of different energy sources on the structure and mechanical properties of EP693 nickel alloy weld joint

Баранов

Жаткин

Никитин

et al. 2021

Izv.VUZ. Tsvet. Met.

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The paper provides the results of a study on the influence of welding types (laser, electron beam, and TIG welding) on the properties of a permanent connection made of an EP693 alloy of the Ni–Cr–W–Co–Mo system used in the production of gas turbine engine components and parts. EP367 filler wire of the Ni–Mo–Cr–Mn system was used to obtain a weld during laser and TIG welding. A comparative analysis of heating areas and power densities was performed for the welding types studied. It was established that TIG welding features by greater values of the heating area and power density in comparison with laser and electron beam welding. It was found that the type of welding affects the features of weld formation. For example, a weld is formed with the transition to knife fusion penetration in the weld root for electron beam welding, and in the form of an «hourglass» for laser welding. The analysis of the heat affected zone microstructure showed that the smallest grain size is formed during laser welding. The distribution of elements in the weld joint was analyzed. It was found that when welding with the use of filler wire, the Mo content increases and the W, Co, Al, and Ti content decreases in the weld and heat affected zone relative to the base metal. This determines the peculiarities of failure for samples obtained using the welding types studied. Samples obtained by TIG and laser welding broke along the heat affected zone on the weld reinforcement side. Samples obtained by electron beam welding broke along the weld. Mechanical tests of samples at room and elevated temperatures showed that samples obtained by laser and electron beam welding have the highest tensile strength.

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High-cycle Fatigue Properties of Alloy718 Base Metal and Electron Beam Welded Joint

Cited by 24 publications

References 14 publications

High Cycle Fatigue Performance of Inconel 718 Alloys with Different Strengths at Room Temperature

High Cycle Fatigue Performance of Inconel 718 Alloys with Different Strengths at Room Temperature

Additive manufacturing-based repair of IN718 superalloy and high-cycle fatigue assessment of the joint

Study into the effect of different energy sources on the structure and mechanical properties of EP693 nickel alloy weld joint

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