An investigation on thermal, metallurgical and mechanical states in weld cracking of Inconel 738LC superalloy

Danis, Yann; Arvieu, Corinne; Lacoste, Éric; Larrouy, Thibaut; Quenisset, J.M.

doi:10.1016/j.matdes.2009.05.041

Cited by 63 publications

(23 citation statements)

References 15 publications

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“…The resolutionization of Ni-base superalloy weldment could encourage the uniform c¢ precipitation by reducing the microsegregation of c¢-forming elements and could improve both tensile strength and tensile elongation. [20] The possible reduction in tensile elongation as associated with the microsegregation of c¢-forming elements for the as-welded Nimonic 263 specimen would be more significant at room temperature because the fracture at room temperature was predominantly along the interdendritic region.…”

Section: B Effect Of Pwht On Welded Nimonic 263mentioning

confidence: 99%

Effect of Welding and Post-weld Heat Treatment on Tensile Properties of Nimonic 263 at Room and Elevated Temperatures

Jeon

Lee

Woo

et al. 2010

Metall Mater Trans A

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Nimonic 263 has been developed for the improved ductility in welded assemblies and is a candidate material for gas turbine combustor and transition pieces along with its good weldability and mechanical properties at room and elevated temperatures. In this study, the tensile behavior of an as-welded Nimonic 263 specimen at room temperature and 1053 K (780°C) was examined in conjunction with microstructural evolution during welding and postweld heat treatment (PWHT). With the welding and the PWHT, the yield strength (YS), ultimate tensile strength (UTS), and tensile elongation of Nimonic 263 varied in a complex manner. It was observed that the PWHT of resolutionization at 1423 K (1150°C) for 2 hours gave the highest YS and UTS values, whereas the tensile elongation was the lowest, at both testing temperatures. With increasing resolutionization time, the YS and UTS tended to decrease along with the increase in tensile ductility. The tensile behaviors of as-welded Nimonic 263 specimens was affected by several factors, including grain size, residual stress, possible microsegregation of c¢ forming elements, a tendency for interdendritic or intergranular fracture and a morphological change in both M 23 C 6 and MC type carbides, depending on the testing temperature and the PWHT. The complex changes in tensile properties of Nimonic 263 with welding and PWHT at room temperature and 1053 K (780°C) were discussed based on the micrographic and fractographic observations.

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Section: B Effect Of Pwht On Welded Nimonic 263mentioning

confidence: 99%

Effect of Welding and Post-weld Heat Treatment on Tensile Properties of Nimonic 263 at Room and Elevated Temperatures

Jeon

Lee

Woo

et al. 2010

Metall Mater Trans A

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“…Preheating at sufficiently high temperatures before welding reduces thermally induced stress. Such preheating more effectively prevents cracking of IN738LC superalloy than does controlling the material ductility through preweld heat treatment [21].…”

Section: Introductionmentioning

confidence: 99%

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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“…Nickel based superalloys find widespread use of high temperature components of gas turbines in both industrial and aerospace applications due to their excellent mechanical, thermal and surface stability (dimensional stability) at elevated temperatures [8]. These alloys can contain up to 60%…”

Section: Application Of Nickel-based Superalloysmentioning

confidence: 99%