Electron Beam Welding of Nimonic 80A Superalloy: Microstructure Evolution and EBSD Study After Aging Heat Treatment

Zhou, Hong; Li, Peidong; Wang, Hongtao; Guan, Zhongwei; Liu, Yongjie; Xiao-nan, Gong

doi:10.1007/s11665-018-3817-5

Cited by 12 publications

(2 citation statements)

References 22 publications

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“…6 These benefits have led to widespread use of the EBW technology in the aerospace sector. 7,8 The base metals (BMs) have the same thermal expansion coefficient and modulus of elasticity but different yield strength (plastic mismatch) and ultimate tensile strength (UTS). The fracture toughness and crack propagation of welded specimens are affected by the mismatch in the mechanical properties.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Lin and N.D. Alexopoulos [11,12] discussed effect of flux precoating and process parameters on dendrite growth and hot cracking susceptibility of Inconel 718 during tungsten inert gas (TIG) welding. H. Zhang [13,14] discussed effect of process parameters and heat treatment on dendrite morphology and microstructure integrity of nickel-based superalloy Nimonic 80A during electron beam welding. Ali Borouni, M. Torfeh and Maodong Kang [15][16][17] discussed effect of material composition and solidification conditions on orientation deviation and dendrite growth anisotropy of high-quality Ni-based single-crystal superalloys PWA-1483 and DD6 during directional solidification casting.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis Growth Kinetics of Dendrite Tip during Laser Welding Nickel-Based Single-Crystal Superalloy Part II: Expedient Favorite of Undercooling-Limited Epitaxy

Gao

2022

SSP

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When multicomponent molten pool nonequilibrium solidification, the interrelationship of location-dependent dendrite tip undercooling on low heat input and optimal growth crystallography is progressively discussed over planar interface morphology stability range to unidirectionally facilitate epitaxial growth by single-crystallinity control during laser repair of nickel-based superalloy to inhibit microstructure heterogeneity. Suppression of disoriented dendrite growth and crystallography orientation deviation along columnar interface is necessary for crackless repair. Axis-symmetrical (001)/[100] welding configuration kinetically reduces dendrite tip undercooling, nucleation and subsequent disoriented dendrite growth rather than unsymmetrical (001)/[110] welding configuration. When comparison between low heat input, within which laser power is limited and welding speed is rapid, and high heat input, within which laser power is considerable and welding speed is insignificant, the former attenuates dendrite tip undercooling and morphology transition between columnar and equiaxed dendrites to stabilize epitaxy and ameliorate dendrite growth with advantageous solidification conditions, especially drastic temperature gradient and small dendrite growth velocity. Axis-symmetrical growth crystallography and low heat input are favored to mitigate size of high-undercooling region, where stray grain formation are dominant, for homologous single-crystallization of epitaxial growth with satisfactory growth kinetics of dendrite tip, and are capable of elimination of undercooling-induced overgrowth for high quality weld, instead of aggressive unsymmetrical growth crystallography and high heat input. Additionally, the achievement of low heat input with axis-symmetrical welding configuration possesses stronger resistance to unstable interface morphology and solidification cracking. When comparison between growth regions of [100] and [010] crystalline orientation, where identical heat input is kept on both sides, wider dendrite tip undercooling is mainly located on the right side than left side to insidiously exacerbate crack-vulnerable dendrite growth, which is a ubiquitous phenomenon in the adverse (001)/[110] welding configuration. The effect of low heat input on dendrite tip undercooling is spontaneously smaller than growth crystallography. Hence, during nonequilibrium solidification of weld pool, the important mechanism of crystallography-induced microstructure heterogeneity obviation due to undercooling-limited epitaxial growth is consequently provided. The theoretical predictions cogently explain the experiment results in a concise way to properly illustrate microstructure degradation phenomena in the both sides of weld by reproducible calculation of mathematical modeling.

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Effect of Process Parameters on the Hardness of Laser Surface Textured 5A06 Aluminum Alloy

Jia

Tao

et al. 2021

J. of Materi Eng and Perform

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Electron Beam Welding of Nimonic 80A Superalloy: Microstructure Evolution and EBSD Study After Aging Heat Treatment

Cited by 12 publications

References 22 publications

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

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

Numerical Analysis Growth Kinetics of Dendrite Tip during Laser Welding Nickel-Based Single-Crystal Superalloy Part II: Expedient Favorite of Undercooling-Limited Epitaxy

Effect of Process Parameters on the Hardness of Laser Surface Textured 5A06 Aluminum Alloy

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