Crack initiation and propagation mechanisms during thermal fatigue in directionally solidified superalloy DZ125

Zhang, Jianglong; Zhang, Zhao; Kong, Yuanhang; Zhang, Zheng; Zhong, Qunpeng

doi:10.1016/j.ijfatigue.2018.09.001

Cited by 46 publications

(18 citation statements)

References 41 publications

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“…The microstructural characterization and effect of microstructural changes on the mechanical properties of aluminum alloys have been well investigated [17][18][19][20]. A prominent microstructural feature, which affects the crack initiation in cast aluminum alloys, includes intermetallic compounds [21,22], the formation of solidification cracks, and metallurgical and mechanical factors [23,24].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…This detached phenomenon predominantly occurs at the grain boundaries or defects, and new cracks initiate near the detached regions, causing more second phase to detach. During the process of thermal fatigue, microstructures drop from the matrix preferentially diverting the driving force for crack growth and inhibiting the crack growth [15] . Therefore, compared with the as-cast sample, thermal fatigue performance of sample is improved by the CT treatment.…”

Section: Thermal Fatigue Crack Growth Behaviormentioning

confidence: 99%

Effects of laser shock processing, solid solution and aging, and cryogenic treatments on microstructure and thermal fatigue performance of ZCuAl10Fe3Mn2 alloy

et al. 2021

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Copper alloys have excellent mechanical properties, high electrical and thermal conductivity, good resistance to wear and corrosion, and a high recycling rate. Certain parts made from copper alloys are extensively used in automobile, aircraft, and ship-building industries. But, their thermal fatigue performance needs to be improved for extending the application fields of the copper alloys to extreme conditions such as high temperature or

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“…[39] Finally, some reports have focused on the crack initiation and growth mechanism of nickel-based superalloys during thermal deformation. [40][41][42][43][44][45][46][47][48] From as-built selective electron beam melting samples, the cracks were classified as hot cracks based on the observation of the fracture surface of machined microtensile specimens, and a clear correlation was identified between cracks and high angle grain boundaries (HAGBs). [47] In the aforementioned references, the crack is closely related to deformation conditions and microstructure and significantly affects the mechanical properties of the product.…”

Section: Doi: 101002/adem201901445mentioning

confidence: 99%

“…Therefore, a modified phenomenological parameter was proposed to enable test data of different orientations and temperatures to fall within a narrow [1/2, 2] band, which shows less temperature dependence compared with the crack tip driving force parameter, Δ K , under the linear elastic fracture framework . Finally, some reports have focused on the crack initiation and growth mechanism of nickel‐based superalloys during thermal deformation . From as‐built selective electron beam melting samples, the cracks were classified as hot cracks based on the observation of the fracture surface of machined microtensile specimens, and a clear correlation was identified between cracks and high angle grain boundaries (HAGBs) …”

Section: Introductionmentioning

confidence: 99%

A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

Jia

Gao

Ji³

2020

Adv Eng Mater

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Hot compression cracking of as‐cast Inconel 625 alloy is investigated utilizing high temperature and high strain rate compression tests. The formation mechanism of the hot crack is systematically investigated based on grain growth and crystal slipping. Scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analysis are used to characterize the crack morphology and microstructure. SEM results showed that the hot cracking during hot compression of Inconel 625 alloy is determined to be quasi‐cleavage fracture. The formation of carbide (NbC) plays a key role in the formation and propagation of the hot crack. The various slip systems activation strongly contributes to the overall growth of the dynamic recrystallization (DRX) grains. In addition, subgranular boundary formation within the grown grains is attribution to various slip systems activation in different local regions. The initiation and propagation of the hot compression cracks in Inconel 625 alloy depend on the development of the subgranular boundary within the grown grain.

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Crack initiation and propagation mechanisms during thermal fatigue in directionally solidified superalloy DZ125

Cited by 46 publications

References 41 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

Effects of laser shock processing, solid solution and aging, and cryogenic treatments on microstructure and thermal fatigue performance of ZCuAl10Fe3Mn2 alloy

A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

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