Fatigue and crack growth behavior of Inconel 718–AL6XN dissimilar welds

Cortés, R.; Rodríguez, N.; Ambriz, R.R.; López, V. H.; Ruíz, Alberto; Jaramillo, David

doi:10.1016/j.msea.2018.12.087

Cited by 38 publications

(10 citation statements)

References 30 publications

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“…It is known that soft areas may storage larger quantity of dislocations [29]. The values obtained in the welded samples in this study agree with those obtained by Cortes et al [30], where the n exponent for the as-welded sample was higher than the aged condition. A large increase from the n 2 to n 3 in the as-welded samples is evident in Table 1 and Fig.…”

Section: Resultssupporting

confidence: 91%

Ramberg–Osgood Stress–Strain Analysis of the Effects of Aging Treatment and Welding on IN600 with a Three-Stage Strain Hardening Behavior

et al. 2021

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The Ramberg-Osgood equation was applied to model the stress-strain behavior of heat-treated and welded specimens of Inconel 600 up to 0.2 and 0.175 mm/mm of strain, respectively. As-received and aged plates of Inconel 600 were gas metal arc welded to simulate repair of a component in operation. Dog bone shape specimens were tensile tested at a cross head speed of 0.005 s −1 and the deformation was measured with an extensometer with a gage length of 20 mm. Microstructural observations were made in the optical and scanning electron microscope. Fitting the experimental data in the plastic region of stress-strain curves to a novel three slopes Ramberg-Osgood model enabled estimation of the hardening coefficient, n. The value of n varied from 0.07 to 0.3 depending on the metallurgical condition of the specimen. A notorious increase was observed in the value of n for samples heat-treated beyond 25 h and in as-welded samples. The results of this work showed a very good correlation between the model and the experimental curves.

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Section: Resultssupporting

confidence: 91%

Ramberg–Osgood Stress–Strain Analysis of the Effects of Aging Treatment and Welding on IN600 with a Three-Stage Strain Hardening Behavior

et al. 2021

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“…In recent years, LFW has also been applied to the assembly of components made of Nickel (Ni)-based superalloys, as well as in many other engineering applications, ranging from automotive to agriculture, and allowing for new designs and applications [1,2]. In addition to overcoming the disadvantages associated with mechanical assembly techniques, such as fretting fatigue and thermomechanical fatigue [3][4][5] observed in conventional blade-disk setups, or cracking and distortions in fusion-based welding assemblies, LFW joints are characterized by higher mechanical properties and extended component life in service [6,7].…”

Section: Introductionmentioning

confidence: 99%

Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730™

Tabaie

Rézaï-Aria²,

Flipo³

et al. 2021

Materials Characterization

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Selective Laser Melted (SLM) Inconel718 (IN718) superalloy was linear friction welded (LFWed) to forged AD730 TM Nickel-based superalloy. Successful joints free of micro-porosity, micro-cracking, and oxides were obtained. Microstructure variations across the weld line developed during LFW were examined using different techniques, including laser confocal microscopy, scanning electron microscopy, energy dispersive spectroscopy (EDS) and electron backscatter diffraction (EBSD). The microstructure was also evaluated, particularly in terms of Grain size and misorientation changes were determined and correlated with microhardness evolution in different regions of the weld joint. The characteristics of the microstructure on both sides of the weld joint was analyzed and related to the deformation and temperature paths imposed during the LFW process. Dynamic recrystallization (DRX) occurred on both sides of the dissimilar weld line and it was found that Discontinuous DRX (DDRX) and Continuous DRX (CDRX) took place in the WZ and in the TMAZ, respectively. In order to study the influence of the starting microstructure in the LFW experiments, LFW of a homogenized SLM IN718 sample was analyzed and compared with the non-homogenized sample. A clear change in the size and grain misorientation levels of the heat and thermomechanical affected zones were observed between the two conditions. The differences were related to a greater degree of strain induced in homogenized sample and the increasing effect of the solid solution strengthening mechanism caused by a partial dissolution of the second-phase strengthening particles in the matrix.

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“…The distance between two adjacent striation marks was approximated as the advance of crack front to one loading cycle and these striations act normal to crack direction. 12 The uniform spacing of striations indicates a constant load range. Secondary cracks were noticed in the fracture surface which also acts normal to crack direction.…”

Section: Resultsmentioning

confidence: 99%

Experimental studies of fracture and fatigue crack growth in dissimilar metal welded joints of nickel-based superalloys: Cracks oriented along the weld

Saju

Velu

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Nickel-based superalloys, Inconel 718 and Nimonic 80A, were welded without any interlayer for Blisk manufacturing in aerospace industries. Fracture toughness and fatigue crack growth rate of the dissimilar metal welded joints were experimentally studied to confirm their structural integrity. Cracks were oriented in and along the weld. Base metals, Inconel 718, and Nimonic 80A differ in yield strength but have the same modulus of elasticity. Electron beam welding was used to butt weld Inconel 718 to Nimonic 80A. J resistance curve ( J vs. crack extension) was experimentally found to determine the elastic–plastic fracture toughness. The welded specimens showed lesser fracture toughness and higher crack growth rates than base metals. An increase in load ratio resulted in an increase in fatigue crack growth rate in the high Δ K region and a decrease in Δ Kth. Fractography studies confirmed linear elastic and plane strain fracture all along the fatigue crack growth rate path except for the final fracture with plane stress.

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Fatigue and crack growth behavior of Inconel 718–AL6XN dissimilar welds

Cited by 38 publications

References 30 publications

Ramberg–Osgood Stress–Strain Analysis of the Effects of Aging Treatment and Welding on IN600 with a Three-Stage Strain Hardening Behavior

Ramberg–Osgood Stress–Strain Analysis of the Effects of Aging Treatment and Welding on IN600 with a Three-Stage Strain Hardening Behavior

Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730™

Experimental studies of fracture and fatigue crack growth in dissimilar metal welded joints of nickel-based superalloys: Cracks oriented along the weld

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