Varestraint weldability testing of cast ATI® 718Plus™—a comparison to cast Alloy 718

Singh, Sukhdeep; Andersson, Joel

doi:10.1007/s40194-018-0626-2

Cited by 11 publications

(8 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many studies related cracking susceptibility as a function of the homogenization extent. In general, the more homogenization, the less cracking, as the amount of secondary precipitates contributing to liquation were also reduced [18]. In the current study, however, the homogenization heat treatment at 1190 °C, with about 0.5 Vv% of secondary Cracking occurred both in fusion and HAZ, but cracking susceptibility in the fusion zone (FZ) did not reveal any difference between the different conditions.…”

Section: Varestraint Testingcontrasting

confidence: 58%

“…aforementioned preweld heat treatment temperatures were investigated for the cast Alloy 718 [12] and ATI ® 718Plus TM [13]. Even though Haynes ® 282 ® is devoid of detrimental Laves phases, a common heat treatment for the three superalloys that minimizes cracking is interesting from an industrial perspective.…”

Section: Methodsmentioning

confidence: 99%

“…Generally, for Fe-Ni and Ni-based superalloys, preweld temperatures are decided so that incipient melting of the low-melting Gamma-Laves eutectic is avoided, which occurs in the range of 1150-1160 • C. This is generally carried out by two different hot isostatic pressing (HIP) approaches, commonly employed in the aerospace industry, at 1120 • C and 1190 • C [9][10][11], respectively, below and above the melting of the Laves eutectic. The aforementioned preweld heat treatment temperatures were investigated for the cast Alloy 718 [12] and ATI ® 718Plus TM [13]. Even though Haynes ® 282 ® is devoid of detrimental Laves phases, a common heat treatment for the three superalloys that minimizes cracking is interesting from an industrial perspective.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Heat-Affected-Zone Liquation Cracking in Welded Cast Haynes® 282®

Singh

Andersson

2019

Metals

Self Cite

View full text Add to dashboard Cite

Varestraint weldability testing and Gleeble thermomechanical simulation of the newly developed cast form of Haynes® 282® were performed to understand how heat-affected-zone (HAZ) liquation cracking is influenced by different preweld heat treatments. In contrast to common understanding, cracking susceptibility did not improve with a higher degree of homogenization achieved at a higher heat-treatment temperature. Heat treatments with a 4 h dwell time at 1120 °C and 1160 °C exhibited low cracking sensitivity, whereas by increasing the temperature to 1190 °C, the cracking was exacerbated. Nanosecond ion mass spectrometry analysis was done to characterize B segregation at grain boundaries that the 1190 °C heat treatment indicated to be liberated from the dissolution of C–B rich precipitates.

show abstract

Section: Varestraint Testingcontrasting

confidence: 58%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Heat-Affected-Zone Liquation Cracking in Welded Cast Haynes® 282®

Singh

Andersson

2019

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…In other Nb-bearing superalloys such as alloy 718 and ATI 718Plus, Nb-rich phases such as MC carbide and Laves eutectics in the interdendritic region are generally well-known to form through eutectic reactions during the solidification process due to elemental microsegregation [21,22,25,29,30]. The formation of both constituents in VDM Alloy 780 may follow a similar solidification reaction sequence as those reported in alloy 718 and ATI 718Plus due to similar Nb and C content in those three alloys.…”

Section: Fz Microstructurementioning

confidence: 62%

Keyhole TIG welding of newly developed nickel-based superalloy VDM Alloy 780

et al. 2022

Self Cite

View full text Add to dashboard Cite

The influence of keyhole TIG (K-TIG) welding parameters on the weld geometry and defects of a new nickel-based superalloy VDM Alloy 780 alloy were investigated using a statistical design of experiment, and the microstructures of the heat-affected zone (HAZ) and fusion zone (FZ) of the K-TIG-welded VDM Alloy 780 were characterized. No cracks are found in the FZ and HAZ. Travel speed significantly influences the minimum weld width (Wm), face and root excess weld metal, face underfill, and average pore diameter. Welding current and the interaction current*travel speed significantly influence the face and root excess weld metals, respectively. Interdendritic microconstituents in the FZ are identified as (Nb,Ti)C particles and γ/Laves eutectic constituents based on SEM–EDS analysis. In addition, plate-like precipitates likely to be δ/η phase are observed surrounding the interdendritic Laves eutectics, and γ′ precipitates are found to be inhomogeneously precipitated in the FZ. In the partially melted zone (PMZ), (Nb,Ti)C, Laves phase, and plate-like particles are found in the liquated and resolidified regions. Constitutional liquation of (Nb,Ti)C in HAZ is observed where the liquated (Nb,Ti)C appears to be associated with the γ/Laves eutectic as a resolidified product.

show abstract

“…Castings, for example, typically exhibit coarse, segregated, and porous microstructures which require homogenization and densification to reach the requirements for critical components. [7,8] In addition, its high strength and ductility make subsequent forging and machining operations inconvenient. [9,10] Furthermore, an intrinsic problem in heavily alloyed superalloys is the tendency to form non-metallic inclusions, which may cluster into larger sized defects during liquid metal processing.…”

Section: Introductionmentioning

confidence: 99%

Effect of Powder Recycling on Defect Formation in Electron Beam Melted Alloy 718

Gruber

Luchian

Hryha

et al. 2020

Metall Mater Trans A

View full text Add to dashboard Cite

The extent to which powder recycling can be permitted before risking a loss in performance of critical components is a major aspect for the viability of electron beam melting (EBM). In this study, the influence of powder oxidation during multi-cycle EBM processing on the formation of oxide-related defects in Alloy 718 is investigated. The amount of defects and their distribution in samples produced from virgin and re-used powder is studied by means of image analysis and oxygen measurements. Morphological analysis using scanning electron microscopy is performed to understand their origin and formation mechanism. The results indicate a clear correlation between the powder oxygen content and the amount of oxide inclusions present in the investigated samples. The inclusions consist of both molten and unmolten Al-rich oxide which originates from the surface of the recycled powder. Upon interaction with the electron beam, the oxide tends to cluster in the liquid metal and form critical sized defects. Hot isostatic pressing can be successfully used to densify samples produced from virgin powder. However, in the material fabricated from recycled powder, a considerable amount of damage relevant oxide inclusion defects remain after HIP treatment, especially in the contour region. It is suggested that the quality of EBM-processed Alloy 718 is at present dependent on the oxygen level in the powder in general, and on the surface chemistry of the power in particular, which needs to be controlled to maintain a low amount of inclusions.

show abstract

Varestraint weldability testing of cast ATI® 718Plus™—a comparison to cast Alloy 718

Cited by 11 publications

References 12 publications

Heat-Affected-Zone Liquation Cracking in Welded Cast Haynes® 282®

Heat-Affected-Zone Liquation Cracking in Welded Cast Haynes® 282®

Keyhole TIG welding of newly developed nickel-based superalloy VDM Alloy 780

Effect of Powder Recycling on Defect Formation in Electron Beam Melted Alloy 718

Contact Info

Product

Resources

About