Study on laser beam welding/superplastic forming technology of multi-sheet cylinder sandwich structure for Inconel718 superalloy with ultra-fine grains

Qu, Fengsheng; Zhang, Lu; Xing, Fei; Zhang, K.F.

doi:10.1016/j.matdes.2012.02.002

Cited by 21 publications

(10 citation statements)

References 10 publications

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“…During deformation, the grain size was found to grow slightly from 1213 K to 1253 K (940°C to 980°C) while its growth rate was dramatically increased after 1253 K (980°C). Similar dynamic grain growth was also observed by Lu et al [23] and Qu et al [24] During the superplastic deforming for IN718 in the strain rates of 10 À3 s À1 to 10 À4 s À1 within wide temperature scopes [1193 K to 1253 K (920°C to 980°C)], the grain size was found to become larger with the increasing strain. [23] Superplastic elongation>200 pct was reported by Medeiros et al [25] at a high temperature of 1373 K (1100°C) and strain rate of 10 À3 s À1 while the grain growth was also observed.…”

Section: Introductionsupporting

confidence: 85%

“…The alloy shows desirable superplastic ductility and the elongation decreased obviously as the temperature increased, which is in agreement with the previous investigations of IN718 alloy. [20,24,33] It is worth noticing that the elongation over 300 pct was obtained at all three temperatures and, in particular, it reaches a maximum elongation of 520 pct at 1223 K (950°C) and 10 À3 s À1 , which is higher than most of the elongations from previous experiments on IN718 alloy. [26,33,34] In order to characterize the deformation behavior of the alloy, the stress vs strain curves were plotted based on the assumption of uniform deformation.…”

Section: Resultsmentioning

confidence: 85%

“…The dynamic recrystallization was seldom mentioned in some previous papers, [22][23][24] while the grain growth was observed to be the primary microstructural characteristic during the deformation, which was promoted by the dissolution of the d phase with the temperature increasing. [24,33] In this paper, the dynamic recrystallization is confirmed to take place, leading to the refined grain microstructure after tensile failure.…”

Section: A Microstructural Characteristicsmentioning

confidence: 99%

“…Second, in contrast, the grain growth was reported with the absence of the dynamic recrystallization. [22][23][24][25] Han et al [22] found that IN718 alloy presented good superplasticity when the strain rate and the deformation temperature were varied in the range of 10 À4 to 10 À1 s À1 and 1213 K to 1293 K (940°C to 1020°C). During deformation, the grain size was found to grow slightly from 1213 K to 1253 K (940°C to 980°C) while its growth rate was dramatically increased after 1253 K (980°C).…”

Section: Introductionmentioning

confidence: 99%

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Discontinuous Dynamic Recrystallization of Inconel 718 Superalloy During the Superplastic Deformation

Huang

Hua

et al. 2015

Metall Mater Trans A

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The superplastic behavior of Inconel 718 superalloy with particular emphasis on the microstructural evolution has been systematically investigated through tensile tests at the strain rate of 10 À3 s À1 and the temperatures ranging from 1223 K to 1253 K (950°C to 980°C). Its elongations exceeded 300 pct under all of the experimental conditions and peaked a maximum value of 520 pct at 1223 K (950°C). Moreover, the stress reached the top value at the strain of 0.3, and then declined until the tensile failure. In addition, we have found that the grain size reduced after deformation while the d phase precipitation increased. Microstructural evolution during the superplasticity was characterized via transmission electron microscope, and the randomly distributed dislocation, dislocation network, dislocation arrays, low-angled subgrains, and high-angled recrystallized new grains were observed in sequence. These new grains were found to nucleate at the triple junction, twin boundary, and near the d phase. Based on these results, it is deemed that the discontinuous dynamic recrystallization occurred as the main mechanism for the superplastic deformation of Inconel 718 alloy.

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Section: Introductionsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 85%

Section: A Microstructural Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Discontinuous Dynamic Recrystallization of Inconel 718 Superalloy During the Superplastic Deformation

Huang

Hua

et al. 2015

Metall Mater Trans A

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“…W.Zhao use BEAM machining Inconel718 achieved MRR exceeds 11,300 mm 3 /min, and the tool wear ratio is lower than 1% [6]. Fuzhu Han investigated High-speed EDM milling with moving electric arcs achieved high material removal rate and good machining accuracy [7].Dinesh Thakur optimized high speed turning of Inconel718 parameters with Taguchi method, the experiment obtained the lower cutting force by optimized cutting speed and feed combination [8].S Dhanabalan optimization of machining parameters of EDM machining Inconel718 by Taguchi method obtained good results [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Plused arc Machining for Superalloy GH4169

Zhao¹,

Zhu²

2017

Proceedings of the 2017 7th International Conference on Education, Management, Computer and Society (EMCS 2017)

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Abstract. Pulsed arc machining can be used to process the difficult-to-machining materials such as nickel base superalloy with high efficiency, but the surface processing quality is not unsatisfactory. To improve the processing quality, surface micro topography, recast layer were observed in the pulsed arc machining of GH4169 superalloy, surface roughness and microhardness has been tested herein. The results shows that processing parameters in duty cycle at 15~55%, pulse frequency at 400 ~ 700HZ achieved surface roughness lower than 25μm. The recast layer that generated in process result in work harden within 0~50μm from the surface. Cracks were easily formed by high frequency and duty cycle, the increased thickness of recast layer formed by low frequency. The machining quality can be improved by reasonable parameters selected.

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Influence of Heat Input on Microstructure and Mechanical Properties of Laser Welding GH4169 Bolt Assembly—Numerical and Experimental Analysis

et al. 2023

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By conducting the numerical and experimental analysis, the influence of heat input on the microstructures and mechanical properties of laser welding GH4169 bolt assembly is systematically investigated. The weld formation, temperature field, and residual stress distribution during laser welding by using the finite element modeling are consistent with experimental results. The numerical simulation results show that the increase of heat input imparts lower residual stresses and higher temperature gradient. During the process of laser welding, the steepest temperature gradient and the peak residual stress arise in the fusion zone (FZ). In addition, the dissolution of γ″ and γ′ toward the fusion line increases in heat affected zone (HAZ), but only Laves phase is observed in FZ. With increasing heat input from 24 to 48 J mm−1, the ultimate tensile strength of welded joints decreases. Both the lowest microhardness values and tensile failure of GH4169 alloy laser welded joint are in FZ. Herein, it is that the relationship among the heat input, microstructures, and mechanical properties of GH4196 bolt assembly in laser welding is systematically established, which will be of guiding significance for the selection of welding parameters in aerospace.

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Study on laser beam welding/superplastic forming technology of multi-sheet cylinder sandwich structure for Inconel718 superalloy with ultra-fine grains

Cited by 21 publications

References 10 publications

Discontinuous Dynamic Recrystallization of Inconel 718 Superalloy During the Superplastic Deformation

Discontinuous Dynamic Recrystallization of Inconel 718 Superalloy During the Superplastic Deformation

Experimental Study of Plused arc Machining for Superalloy GH4169

Influence of Heat Input on Microstructure and Mechanical Properties of Laser Welding GH4169 Bolt Assembly—Numerical and Experimental Analysis

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