Microstructural analysis of fusion and heat affected zones in electron beam welded ALLVAC® 718PLUS™ superalloy

Vishwakarma, K.R.; Richards, N.L.; Chaturvedi, M.C.

doi:10.1016/j.msea.2007.08.002

Cited by 115 publications

(37 citation statements)

References 17 publications

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“…Similar features associated with grain boundary liquation cracking in the HAZ of EB-welded 718 Plus were observed in a previous investigation by the current authors. 2,26 The characteristics of the particles that appear to have formed by liquation and resolidification reactions in linear friction-welded 718 Plus are comparable with those observed in the EB welds of the alloy, 26 although unlike the EB welds, no microfissuring was observed during LFW. The occurrence of grain boundary liquation is not a sufficient condition for cracking to occur.…”

Section: As-welded Microstructuresupporting

confidence: 52%

“…It was observed that the morphology of these particles is different from that of the d phase particles but is similar to that of Laves phase particles. 2 Therefore, based on the chemical analysis and morphology, these products are suggested to be Laves phase. Figure 11 shows one such particle and the corresponding EDS analysis spectrum.…”

Section: As-welded Microstructurementioning

confidence: 99%

“…1 718 Plus is precipitation strengthened by the ordered c¢ phase, although it has a lower volume fraction compared to other c¢-strengthened alloys. Previous investigations on fusion welding of 718 Plus using electron beam (EB) 2 as well as laser beam 3 showed that 718 Plus undergoes heat-affected zone (HAZ) microfissuring during welding and postweld heat treatment (PWHT) due to liquation effects.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Analysis of Linear Friction-Welded 718 Plus Superalloy

Vishwakarma

Ojo

Wanjara

et al. 2014

JOM

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Section: As-welded Microstructuresupporting

confidence: 52%

Section: As-welded Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Analysis of Linear Friction-Welded 718 Plus Superalloy

Vishwakarma

Ojo

Wanjara

et al. 2014

JOM

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“…Therefore, differences of these elements are assumed to be less important. When considering the phosphorous content of 0.004 wt.% in Waspaloy®, which is double compared with that of Haynes® 282® and the boron content of 0.006 wt.% compared with 0.004 wt.%, respectively, the weldability is generally accepted to be worse for Waspaloy® [7,[25][26][27][28] . The element segregation of melting point depressants like boron and phosphorous, can reduce the melting point of the grain boundaries.…”

Section: Trace Elements Phosphorous and Boronmentioning

confidence: 99%

Weldability of Ni-Based Superalloys Waspaloy® and Haynes® 282® - A Study Performed with Varestraint Testing

Jacobsson

Andersson

Brederholm³

et al. 2016

Res. Rev. J Mat. Sci

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“…지어 해석한다 5,6) . HAZ 액화균열은 고온 입계균열 현 Table 2 Hot ductility testing condition Peak temperature(T p ) Fig.…”

Section: 자체의 용융점을 상당량 낮추는 보론(B) 인(P) 황 (S)등의 편석에 의한 국부적 입계 용융으로 주로 연관unclassified

Effects of Serrated Grain Boundary Structures on Boron Enrichment and Liquation Cracking Behavior in the Simulated Weld Heat-Affected Zone of a Ni-Based Superalloy

Hong

Choi²,

Bae³

et al. 2013

Journal of the Korean Welding and Joining Society

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The transition of serrated grain boundary and its effect on liquation behavior in the simulated weld heat-affected zone (HAZ) have been investigated in a wrought Ni-based superalloy Alloy 263. Recently, the present authors have found that grain boundary serration occurs in the absence of adjacent coarse γṕ articles or M 23 C 6 carbides when a specimen is direct-aged with a combination of slow cooling from solution treatment temperature to aging temperature. The present study was initiated to determine the interdependence of the serration and HAZ property with a consideration of this serration as a potential for the use of a hot-cracking resistant microstructure. A crystallographic study indicated that the serration led to a change in grain boundary character as special boundary with a lower interfacial energy as those terminated by low-index {111} boundary planes. It was found that the serrated grain boundaries are highly resistant to boron enrichment, and suppress effectively grain coarsening in HAZ. Furthermore, the serrated grain boundaries showed a higher resistance to susceptibility of liquation cracking. These results was discussed in terms of a significant decrease in interfacial energy of grain boundary by the serration.

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Microstructural analysis of fusion and heat affected zones in electron beam welded ALLVAC® 718PLUS™ superalloy

Cited by 115 publications

References 17 publications

Microstructural Analysis of Linear Friction-Welded 718 Plus Superalloy

Microstructural Analysis of Linear Friction-Welded 718 Plus Superalloy

Weldability of Ni-Based Superalloys Waspaloy® and Haynes® 282® - A Study Performed with Varestraint Testing

Effects of Serrated Grain Boundary Structures on Boron Enrichment and Liquation Cracking Behavior in the Simulated Weld Heat-Affected Zone of a Ni-Based Superalloy

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