Effect of substrate orientations on microstructure evolution and stability for single crystal superalloys in rapid solidification process

Dong, Tao; Gao, Chentong; Li, Ling; Pei, Yanling; Li, Shusuo; Gong, Shengkai

doi:10.1016/j.matdes.2017.04.102

Cited by 18 publications

(2 citation statements)

References 33 publications

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“…The WFS has a great influence on the stability of the microstructure caused by the formation of solidification cracks. The stability of the microstructure can be studied through the crystal structure [28,29]. Figure 6 shows the effect of the WFS on the microstructure around the solidification cracks.…”

Section: Effect Of the Wfs On The Microstructure Near Cracksmentioning

confidence: 99%

The Effect of Wire Feeding Speed on Solidification Cracking of CMT Welding for Al-Si Alloys

Huang

Chen

Konovalov

et al. 2021

Metals

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In this work, a welding solidification crack sensitivity test platform was established to study the effect of wire feeding speed (WFS) on solidification crack sensitivity during cold metal transfer (CMT) welding for AA6061 aluminum alloy. The test results show that as the WFS increased from 4 m/min to 5.5 m/min, the sensitivity of the solidification cracks also increased. With a further increase in the value of the WFS, the crack sensitivity decreased and eventually ceased to exist. A new perspective of the microstructure and crack propagation mechanics model was applied to understand the effect of WFS on solidification cracks. With the use of scanning electron microscopy (SEM) and a high-speed camera, it was found that as the WFS increased from 4 m/min to 5.5 m/min, the microstructure of the grain size changed from bigger to smaller, and the stability of the crystal microstructure was reduced. The crack propagation mechanics model was changed, which promotes crack propagation, increasing by 233%. When the WFS continued to increase beyond 5.5 m/min, the size of the crystal structure changed from small to big, the stability of the crystal microstructure was increased, the crack generation was suppressed, and the cracking rate was significantly reduced.

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Section: Effect Of the Wfs On The Microstructure Near Cracksmentioning

confidence: 99%

The Effect of Wire Feeding Speed on Solidification Cracking of CMT Welding for Al-Si Alloys

Huang

Chen

Konovalov

et al. 2021

Metals

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show abstract

“…A large thermal stress is usually caused by the temperature gradient through the thickness direction due to the using of an internal air-cooling system in the blades [3][4][5]. The stress causes surface recrystallization, thermal barrier coating (TBC) separation, and fatigue crack nucleation that are detrimental to the blades [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Investigations into the Surface Strain/Stress State in a Single-Crystal Superalloy via XRD Characterization

Duan

Pei

et al. 2018

Metals

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Abstract:The present study was aimed at determining the surface strain/stress state in an Ni-based single-crystal (SC) superalloy that was subjected to two different cooling rates from solid solution temperature through using the X-ray diffraction (XRD) method. The normal stresses σ s 11 and σ s 22were determined, then the Von Mises stresses (σ s V M ) were derived from them. Field emission gun scanning electron microscope (FEG-SEM) and transmission electron microscope (TEM) micrographs were taken to illustrate the strain/stress state change. The precipitation of the secondary γ phases in the γ phase and the formation of the dislocation in the interphase upon a slower cooling rate caused the γ phase lattice distortion to increase, so a larger σ s V M of the γ phase was realized in comparison to the faster cooling sample. For both of the two cooling modes, we found that the σ s V M of the γ phase increased due to the growth of the γ phase during the aging process. Also, the aging process led to pronouncedly anisotropic lattice mismatches in the {331} and {004} planes. In addition, the surface strain/stress states of a cylinder sample and a tetragonal sample were also studied using a faster cooling rate, and σ s 11 and σ s 22 were analyzed to explain the influence of the shape factor on the stress anisotropy in the [001] and 110 orientations. The strain in the [001] orientation of the γ phase is more sensitive to the shape change.

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Study on the Formation of the Crater and Modified Layer in EDM Titanium Alloys Based on Fluid–Solid Coupled Temperature Field Model

Chen

et al. 2023

Int. J. Precis. Eng. Manuf.

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Effect of substrate orientations on microstructure evolution and stability for single crystal superalloys in rapid solidification process

Cited by 18 publications

References 33 publications

The Effect of Wire Feeding Speed on Solidification Cracking of CMT Welding for Al-Si Alloys

The Effect of Wire Feeding Speed on Solidification Cracking of CMT Welding for Al-Si Alloys

Investigations into the Surface Strain/Stress State in a Single-Crystal Superalloy via XRD Characterization

Study on the Formation of the Crater and Modified Layer in EDM Titanium Alloys Based on Fluid–Solid Coupled Temperature Field Model

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