Contribution of constitutional liquation of gamma prime precipitate to weld HAZ cracking of cast Inconel 738 superalloy

Ojo, O.A.; Richards, N.L.; Chaturvedi, M.C.

doi:10.1016/j.scriptamat.2003.11.025

Cited by 238 publications

(114 citation statements)

References 10 publications

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“…The results indicated that MC carbides, M3B2 borides, η-Ni3Ti and Ni7Zr2 intermetallics associated with γ' precipitates in the γ matrix, suggesting that the segregation of alloy elements during solidification caused the formation of many solidification products in the cast superalloy. According to previous research [7,8,12,14], different grain boundary constituents, such as MC carbide, M2SC sulphocarbide, Cr-Mo boride, Ni-Zr intermetallics, and γ-γ' (Ni3(Al,Ti)) eutectic have been observed in IN738/IN738LC superalloys. In this study, η-Ni3Ti was also detected in the alloy.…”

Section: Microstructural Examinationsmentioning

confidence: 89%

“…Traditionally, repair-welding of Ni-base superalloys has been conducted by gas tungsten arc welding (GTAW) processes [7][8][9][10][11]. However, the precipitation-hardened Ni-base superalloys are very sensitive to hot cracking in the heat-affected zone (HAZ) and fusion zone (FZ) during welding [7,8,[12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…However, the precipitation-hardened Ni-base superalloys are very sensitive to hot cracking in the heat-affected zone (HAZ) and fusion zone (FZ) during welding [7,8,[12][13][14]. IN738 contains considerable amounts of Al and Ti, which is known for its poor weldability.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Chen

Shiue

et al. 2018

Metals

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Abstract:The main scope of this study investigated the occurrence of liquation cracking in the heat-affected zone (HAZ) of IN738 superalloy weld, IN738 is widely used in gas turbine blades in land-based power plants. Microstructural examinations showed considerable amounts of γ' uniformly precipitated in the γ matrix. Electron probe microanalysis (EPMA) maps showed the γ-γ' colonies were rich in Al and Ti, but lean in other alloy elements. Moreover, the metal carbides (MC), fine borides (M 3 B 2 and M 5 B 3 ), η-Ni 3 Ti, σ (Cr-Co) and lamellar Ni 7 Zr 2 intermetallic compounds could be found at the interdendritic boundaries. The fracture morphologies and the corresponding EPMA maps confirmed that the liquation cracking in the HAZ of the IN738 superalloy weld resulted from the presence of complex microconstituents at the interdendritic boundaries.

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Section: Microstructural Examinationsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Chen

Shiue

et al. 2018

Metals

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“…8(b)), or carbides (see Fig. 8(c)) 2,3,14) located on the weld fusion line and propagating along the parallel line-shaped grain boundaries into the WFZ.…”

Section: )mentioning

confidence: 99%

“…Earlier attempts were conducted 2,3) to investigate the heat-affected zone (HAZ) or interface liquidation crack after the GTAW or TIG welding process. For a superalloy containing high Al and Ti concentrations ( 0 formers), due to the presence of the strengthening phase, ordered Ll2 Ni 3 (Al, Ti) 0 phase, the repaired cast tends to be susceptible to hot cracking in the weld metal and liquation cracking in the HAZ during the traditional GTAW or TIG repair welding process.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Laser Repair Welded René 77 Nickel-Based Superalloy Cast

Wang

Huang

et al. 2011

Mater. Trans.

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This study performed repair-welding tests on René 77 Nickel-based superalloy by adopting a Nd:YAG pulsed laser technique, coupled with René 41 filler wire and various welding parameters. After welding, the microstructure evolution, crack behavior and mechanical properties of the welds were determined by a combination of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and micro-hardness test. The experimental results showed that, due to suffering from different thermal histories during the conduction of the multi-pass welding process, the microstructures within the welds had split into six zones. In terms of cracking behavior, no cracks formed in the weld fusion zone (WFZ) or the heat-affected zone (HAZ) under appropriate welding parameters; however, setting the laser energy too high resulted in weld centerline cracking or intergranular cracking in the weld fusion zone. Moreover, various types of liquation cracks may occur at the interface between the WFZ and the HAZ.

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Mechanical Properties of Friction Stir Welded Inconel 600/SS 400 Lap Joints

Song

Kim

Nakata

2012

Characterization of Minerals, Metals, and Materials

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Contribution of constitutional liquation of gamma prime precipitate to weld HAZ cracking of cast Inconel 738 superalloy

Cited by 238 publications

References 10 publications

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Microstructure Evolution of Laser Repair Welded René 77 Nickel-Based Superalloy Cast

Mechanical Properties of Friction Stir Welded Inconel 600/SS 400 Lap Joints

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Contribution of constitutional liquation of gamma prime precipitate to weld HAZ cracking of cast Inconel 738 superalloy

Cited by 238 publications

References 10 publications

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Microstructure Evolution of Laser Repair Welded Ren&eacute; 77 Nickel-Based Superalloy Cast

Mechanical Properties of Friction Stir Welded Inconel 600/SS 400 Lap Joints

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Microstructure Evolution of Laser Repair Welded René 77 Nickel-Based Superalloy Cast