Microstructural evolution and compositional homogenization of a low Re-bearing Ni-based single crystal superalloy during through progression of heat treatment

Su, Xin; Xu, Qingyan; Wang, Runnan; Xu, Zilin; Liu, Shizhong; Liu, Baicheng

doi:10.1016/j.matdes.2017.12.020

Cited by 41 publications

(21 citation statements)

References 66 publications

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“…The DD6 Ni-base superalloy consists of ten elements, and they can exacerbate the microstructural and chemical heterogeneities. The elements enriched in DAs are Co, W and Re, while those enriched in IDRs are Al, Cr, Mo, Ta and Nb [ 26 ]. As the main precipitated strengthening phases, γ’ phase plays a role in deformation mechanism of Ni-base superalloys.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the chemical compositions quantitatively detected by EPMA ( Table 6 ), which are reported in our previous study [ 26 ], the solution behavior of γ’ phases in DAs, IDRs and eutectics is calculated by the commercial thermodynamic calculating software JMatPro. As shown in Figure 10 , the full solution temperatures of DAs, IDRs and γ/γ’ eutectics are 1284 °C, 1330 °C and 1364 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…For the circle counting area,

. Commercial thermodynamic calculating software, JMatPro6.1 and Nickel Based Superalloy database, were employed to determine the fraction of γ’ phase in DAs and IDRs based on the local compositions quantitatively determined by Electron probe micro-analyzer (EPMA) [ 26 ].…”

Section: Methodsmentioning

confidence: 99%

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Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

Wang

Xiao-nan³

et al. 2018

Materials

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The recrystallization (RX) behavior of superalloy during standard solution heat treatment (SSHT) varies significantly with deformation temperature. Single-crystal (SX) samples of Ni-base superalloy were compressed to 5% plastic deformation at room temperature (RT) and 980 °C, and the deformed samples were then subjected to SSHT process which consists of 1290 °C/1 h, 1300 °C/2 h, and 1315 °C/4 h, air cooling. RT-deformed samples showed almost no RX grains until the annealing temperature was elevated to 1315 °C, while 980 °C-deformed samples showed a large number of RX grains in the initial stage of SSHT. It is inferred that the strengthening effect of γ’ phases and the stacking faults in them increase the driving force of RX for 980 °C-deformed samples. The RX grains nucleate and grow in dendritic arms preferentially when the microstructural inhomogeneity is not completely eliminated by SSHT. A model coupling crystal plasticity finite element method (CPFEM) and cellular automaton (CA) method was proposed to simulate the RX evolution during SSHT. One ({111} <110>) and three ({111} <110>, {100} <110>, {111} <112>) slip modes were assumed to be activated at RT and 980 °C in CPFEM calculations, respectively. The simulation takes the inhomogeneous as-cast dendritic microstructure into consideration. The simulated RX morphology and density conform well to experimental results.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

Wang

Xiao-nan³

et al. 2018

Materials

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“…The solute elements are distributed during the solidification process, eventually forming dendritic segregation. The existence of solidification segregation leads to a low degree of alloying between the dendrites of the alloy, which becomes a channel for crack propagation and significantly reduces the mechanical properties of the alloy [14,15]. The presence of more γ + γ′ eutectic and coarse γ′ phase in the as-cast microstructure of single-crystal superalloys reduces the properties of the alloy [16].…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 demonstrates a standard heat treated system. The heat treated sample was mechanically ground and polished, and then the sample was electrolytically etched at 5 V for 5-10 s at room temperature with 150 ml H 3 PO 4 +15 g CrO 3 +10 ml H 2 SO 4 +10 ml H 2 O [15]. The microstructure of the alloys treated by different heat treatment procedures was then observed using an optical microscope and scanning electron microscope.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution of DD6 during different heat treatment conditions

Huang

Zhao

et al. 2019

Mater. Res. Express

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001] oriented DD6 alloy was prepared by directional solidification in this experiment. γ′ phase precipitation phase structure of different morphology and size was obtained by different high temperature ageing heat treatment processes. Through this experiment, the feasibility of improving high temperature performance by adjusting the heat treatment process to change the microstructure of the single crystal was explored. The as-cast DD6 is first subjected to standard heat treatment(SHT). The single crystal sample after the standard heat treatment was further kept at 900°C-1300°C for 10 min, 30 min and 1 h, finally air-cooled respectively. Heat treatment process of DD6 was simulated using Jmatpro software. The individual phase transition temperatures of the alloy were determined by DSC experiments. And the size and volume fraction of precipitated phase of the alloy were estimated using Image-Pro Plus software. It is concluded that the microstructure of the alloy obtained after holding at 1100°C for 30 min after standard heat treatment has the most uniform microstructure distribution.

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Effect of Al and W Contents on the Solidification and Solution Microstructure of Novel γ/γ′ Cobalt‐Base Superalloys

Zhang

et al. 2019

Adv Eng Mater

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The solidification and heat treatment characteristics of superalloys are key to engineering and practical applications. The solidification and solid solution behavior of γ/γ′ cobalt‐base superalloys Co–30Ni–xAl–(15 − x)W–5Cr–1Ta–4Ti (x = 7, 9, 11 abbreviated as 7Al8W, 9Al6W, and 11Al4W, respectively) are studied using directional solidification experiments. The results indicate that there are Laves phase, (γ + γ′)e eutectics, and (β + γ′)e eutectics in the interdendritic regions for the 7Al8W alloy. The solidification sequence of the 7Al8W alloy is L → L1 + γ → L2 + γ + Laves → L3 + γ + Laves + (β + γ′)e →L4 + γ + Laves + (β + γ′)e + (γ + γ′)e → γ + Laves + (β + γ′)e + (γ + γ′)e. As the Al content increases and the W content decreases, the Laves phase fraction in the alloy decreases and the (β + γ′)e eutectics fraction increases. The Laves phase completely disappears in the 11Al4W alloy. An unremovable μ phase forms in the 7Al8W alloy during solution treatment. The 9Al6W alloy and 11Al4W alloy can exhibit a γ single‐phase microstructure after single‐stage solution treatment (1250 °C for 1 h) and two‐stage solution treatment (1210 °C for 1 h + 1275 °C for 1 h), respectively. These experimental results are helpful for composition optimization, solidification, and solution treatment parameter determination of novel γ/γ′ cobalt‐base superalloys.

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Microstructural evolution and compositional homogenization of a low Re-bearing Ni-based single crystal superalloy during through progression of heat treatment

Cited by 41 publications

References 66 publications

Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

Microstructure evolution of DD6 during different heat treatment conditions

Effect of Al and W Contents on the Solidification and Solution Microstructure of Novel γ/γ′ Cobalt‐Base Superalloys

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