Effect of welding parameters on microstructure, mechanical properties and hot cracking phenomenon in Udimet 520 superalloy

Nematzadeh, Fardin; Akbarpour, M.R.; Parvizi, Soroush; Kokabi, A.H.; Sadrnezhaad, S.K.

doi:10.1016/j.matdes.2011.10.020

Cited by 19 publications

(9 citation statements)

References 13 publications

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“…Montazeri [10] reported that using low laser power to reduce the heat input and liquation was effective to achieve the crack-free samples for Inconel 738LC nickel-based superalloy during laser welding. Analogous results have also been reported in several researches [6,18]. However, Idowu [14] indicated that the high heat input is also in favor of eliminating the cracks by generating the more liquidation to release the thermal stresses during gas tungsten arc (GTA) welding of Allvac 718Plus nickel-based superalloy.…”

Section: Introductionsupporting

confidence: 74%

“…3(b)) in the deposit and the skeletal morphology in the HAZ of the substrate, respectively. Previous researches showed that the segregation of γ′ forming elements including Ti and Al in the interdendrites and the grain boundaries during the solidification process could lead to the formation of γ-γ′ eutectic, while the segregation of Ta, Hf and W could lead to the formation of MC carbides [15,18]. Generally, the growth of the carbides required the appropriate solute supersaturation, supercooling and sufficient time and space [22].…”

Section: Microstructurementioning

confidence: 99%

“…Ojo [15] found that the concentration of γ′ forming elements into interdendritics regions (mainly Al and Ti) in Inconel 738LC nickel-based superalloy could lead to the high sensibility of liquation cracks in Gleeble thermomechanical simulation and tungsten inert gas (TIG) welding. (2) Thermal stresses: Generally, the thermal stresses are primarily determined by the inhomogeneous thermal field and the steep thermal gradients in the deposits [9,18]. The rapid heating and cooling process and the high temperature gradient in the molten pool and its HAZ during LSF process lead to a high thermal stresses in the deposits [19].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of heat input on cracking in laser solid formed DZ4125 superalloy

Lin

Song

et al. 2016

Optics & Laser Technology

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Section: Introductionsupporting

confidence: 74%

Section: Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of heat input on cracking in laser solid formed DZ4125 superalloy

Lin

Song

et al. 2016

Optics & Laser Technology

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“…They concluded that a substantial amount of heat was transferred to the welding pool at higher welding current and relatively low welding speed which resulted in a large welding pool, fewer columnar dendrites, and a higher number of free dendrites. Nematzahde et al 12 investigated the effect of various TIG-welding parameters such as welding current and welding speed on the microstructure and mechanical characteristics of nickel-superalloy Udimet 520. The weldments had cellular dendritic microstructure, with a uniform distribution of MC type carbides.…”

Section: Introductionmentioning

confidence: 99%

Influence of welding current on the microstructure, mechanical properties, residual stresses, and nano-mechanical behavior of tungsten inert gas-welded dissimilar joints of Inconel 625 and Incoloy 800

Ramay

Shehbaz

Khan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the present work, Inconel 625 and Incoloy 800 thin sheets were TIG-welded without using fillers and at three different welding currents (40 A, 50 A, and 60 A). The influence of variation in welding currents on various characteristics of the weldments was investigated using various characterization techniques. Weldments obtained at 60 A showed the highest tensile strength and plastic deformation due to the formation of cellular dendritic microstructure in the fusion zone. Observation of the fractured surfaces revealed ductile nature for all the weldments. In addition, impact tests were performed at 25°C, 150°C, and 250°C, and the results indicated that with the rise in temperature, impact toughness decreased due to coarsening of carbides at grain boundaries in all the weldments. Furthermore, impact properties and hardness of weldments were also affected owing to the differences in interdendritic spacing and grain size. Weldments obtained at 40 A depicted higher nanohardness, whereas 50 A weldment showed relatively greater pileup height as compared to other weldments. Moreover, 60 A weldments showed highest longitudinal and transverse residual stresses due to relatively higher volumetric changes.

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“…Some authors have found that the heat input during the LSF process was closely related to the crack defects; thus, by controlling the LSF process parameters, the crack defects in the superalloy could be inhibited. [14][15][16][17] Many parameter optimization studies have been conducted. The effects of the processing parameters (such as laser power, scanning speed, and powder feeding rate) on the quality of the deposit were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Effects of preheating and cooling on the crack defects of laser solid formed Rene 104 superalloy parts

Ying

Han

Wang

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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In this study, laser solid forming technology has been used to fabricate Rene 104 nickel-based superalloy parts, and severe crack problems were found during the laser solid forming process. To solve the crack problems, the effects of preheating and cooling on the microstructure and crack defects of the laser solid forming Rene 104 superalloy were experimentally investigated. The experimental results demonstrated that crack intensity in parts obtained using laser solid forming decreased with the increase in the preheating temperature. However, when the cooling process was not controlled, the parts obtained using laser solid forming would still exhibit severe crack problems even if the preheating temperature was increased to 750 °C. Therefore, instead of natural cooling, a slow cooling strategy was used after the laser solid forming process in the experiments. It was proved that decreasing the cooling rate of the substrate also helped in eliminating the cracks. Using the slow cooling strategy, crack-free Rene 104 superalloy parts could be fabricated at a relatively low preheating temperature. Moreover, it was found that the multiple growth direction of columnar dendrites under high preheating temperature restricted the propagation of cracks. The microsegregation of Al and Ti in the interdendritic regions decreased when the slow cooling strategy was used, leading to improvements in ductility. Aside from the evolution of the microstructure, the relief of thermal stress during the slow cooling process was another important reason for eliminating the cracks.

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Effect of welding parameters on microstructure, mechanical properties and hot cracking phenomenon in Udimet 520 superalloy

Cited by 19 publications

References 13 publications

Effect of heat input on cracking in laser solid formed DZ4125 superalloy

Effect of heat input on cracking in laser solid formed DZ4125 superalloy

Influence of welding current on the microstructure, mechanical properties, residual stresses, and nano-mechanical behavior of tungsten inert gas-welded dissimilar joints of Inconel 625 and Incoloy 800

Effects of preheating and cooling on the crack defects of laser solid formed Rene 104 superalloy parts

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