Morphology of weld heat-affected zone liquation in cast alloy 718

Baeslack, W.A.; Nelson, David E.

doi:10.1016/0026-0800(86)90024-8

Cited by 45 publications

(19 citation statements)

References 2 publications

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“…% niobium (Nb) [2]. As has been long-known, the presence of NbC and Laves phase in Alloy 718 can contribute to hot cracking in the heat-affected zone (HAZ) during welding [3][4][5][6]. The overall microstructure of a material, including existing phases, their morphology, and distribution is directly related to the manufacturing process and subsequent post-processing conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718

Raza

Hurtig

Asala

et al. 2019

Metals

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The weldability of additive manufactured Alloy 718 was investigated in various heat-treated conditions. The microstructure of the base metal was examined in detail in order to understand the effect of different pre-weld heat treatments; i.e., solution, solution and aging, and hot isostatic pressing. After welding, the variation in total crack lengths, maximum crack length and the total number of cracks in the heat affected zone (HAZ) were used as criteria for the cracking susceptibility of each material condition where wrought Alloy 718 was used as the reference material. Selective laser melting (SLM) manufactured Alloy 718 was susceptible to HAZ cracking in all material conditions. Total crack lengths in HAZ were highest in the SLM as-built condition and lowest in the SLM hot isostatic pressed condition. The cracks that were found in the HAZ of the welded materials consisted of liquation cracks, with eutectic product surrounding the cracks, as well as cracks from which liquation products were absent.

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Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718

Raza

Hurtig

Asala

et al. 2019

Metals

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“…However, recent years have seen applications of alloy castings being examined to reduce the number of weld locations in rocket engines. Baeslack et al, 5 Thompson et al, 6 Kelly et al, 7 and Huang et al 8 have researched the weldability of Inconel 718 cast alloy. The results obtained by these authors suggest that the precipitation of solidification segregations, coarse grains, and brittle Laves phase during casting faces the cast alloy with a bigger weldability problem than the forged one.…”

Section: Introductionmentioning

confidence: 98%

Characteristics of heat affected zone cracking in Inconel 718 cast alloy. Study of weldability of Inconel 718 cast alloy (1st Report)

Woo

Nishimoto

Tanaka

et al. 2000

Welding International

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“…One of the main mechanisms for HAZ microfissuring relies on the constitutional liquation of the precipitates caused by the rapid weld thermal cycle [3][4][5][6]. Boundary liquid film comes into being in the subsolidus portion of HAZ; if the local stress exerted on the film is tensile, then the grains will be separated, and liquation cracks will occur [4].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of solidification and liquation behavior during welding of low-expansion superalloys

Guo

2011

Front. Mater. Sci.

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Low-expansion superalloys are susceptible to weld solidification cracks and heat-affected zone (HAZ) microfissures. To predict solidification cracking, QBasic procedures were developed and solidification reaction sequence, type, and amount of eutectic product were calculated. As manifested, primary solidification is followed by L ! (γ + NbC) and L ! (γ + Laves) eutectic reaction sequentially for GH903 and GH907; hence, the terminal eutectic constituents are made up of γ/NbC and γ/Laves. While for GH909, only reaction L ! (γ + Laves) occurs and more γ/Laves eutectic forms. Therefore, GH909 is more sensitive to solidification cracking. To predict HAZ liquation, cracking Visual FORTRAN procedures were developed, and constitutional liquation of NbC was simulated. As shown, solid dissolution of NbC prior to liquation decreases, and initial liquid film increases with the rate of thermal cycle. Higher rate of thermal cycle promotes the melting of the matrix adjacent to the liquid film and postpones the solidification of the liquid by the liquid-to-γ mode. Thus, more residual liquid film remains at the eutectic point, which will promote HAZ microfissuring. The increase in original grain size and peak temperature also promotes liquation. Finally, these conclusions were verified indirectly by hot ductility tests.

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Morphology of weld heat-affected zone liquation in cast alloy 718

Cited by 45 publications

References 2 publications

Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718

Influence of Heat Treatments on Heat Affected Zone Cracking of Gas Tungsten Arc Welded Additive Manufactured Alloy 718

Characteristics of heat affected zone cracking in Inconel 718 cast alloy. Study of weldability of Inconel 718 cast alloy (1st Report)

Numerical simulation of solidification and liquation behavior during welding of low-expansion superalloys

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