Pore formation in single-crystal turbine rotor blades during directional solidification

Orlov, M. R.

doi:10.1134/s0036029508010114

Cited by 18 publications

(11 citation statements)

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“…To do so, a simple model is introduced below to further comment on the effect of the cooling rate on the nucleation of small pores. Both mechanism A and mechanism B are assumed to follow a Gaussian nucleation rate as suggested by equation (1).…”

Section: Effect Of Cooling Rate On Pore Nucleationmentioning

confidence: 99%

“…The control of shrinkage porosity in cast nickel-based superalloys is essential to extend the service life of jet engine components being operated at high-temperature under cyclic loads. Casting defects such as shrinkage pores are well-known nucleation sites for microcracks in low cycle fatigue [1,2] as well as in high cycle fatigue [3]. Defect sizes ranging from a few microns to several hundreds of microns can affect fatigue properties but the largest defect is often considered as the key parameter that governs the fatigue resistance.…”

Section: Introductionmentioning

confidence: 99%

“…Figure11. Distribution of parameters and 0 from equation(1), fitted on individual pores using the tracking method, for two cooling rate: (a) 0.5°C/s and (b) 1°C/s. The size of each dot is proportional to the final equivalent diameter of the pore.…”

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confidence: 99%

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Tracking pores during solidification of a Ni-based superalloy using 4D synchrotron microtomography

et al. 2019

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Time-resolved in situ microtomography is employed to track the nucleation and growth of individual pores during solidification of a commercial nickel-based superalloy. Three cooling rates (0.1, 0.5 and 1°C/s) are investigated to evaluate the effect of this key processing parameter on the formation of porosity. Phase contrast obtained with a coherent X-ray beam is used to visualize the evolution of dendritic structures in absence of a sufficient absorption contrast. Two mechanisms leading to shrinkage pores have been identified. The first mechanism (mechanism A) is associated with the coalescence of secondary dendrite arms at temperature during the early stages of solidification. The second mechanism (mechanism B) is related to insufficient liquid feeding in the interdendritic region during the last stages of solidification, at lower temperatures. A variation of cooling rate by a factor 2 does not affect the nucleation rate of pores generated through mechanism B. However, it seems to affect the nucleation rate of small pores obtained through the mechanism A. The kinetics of growth for the majority of individual pores can be described using an exponential-like function. This kinetics is faster for mechanism B compared to mechanism A.

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Section: Effect Of Cooling Rate On Pore Nucleationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tracking pores during solidification of a Ni-based superalloy using 4D synchrotron microtomography

et al. 2019

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“…Valenza et al studied the wettability and interface reaction of superalloys on different ceramic substrates by using the "sessile drop" method [3]. Although the reaction product and the wetting angle were studied in details, the relationship between wettability and interface reaction was not clarified in [3]. a Corresponding author: yzzhou@imr.ac.cn…”

Section: Introductionmentioning

confidence: 99%

“…Zheng pointed out that Cr, Al and Ti in superalloys reacted with silicon oxide, forming Cr 2 O 3 and inducing some metallic nodular protrusions on the surface of alloys [2]. Valenza et al studied the wettability and interface reaction of superalloys on different ceramic substrates by using the "sessile drop" method [3]. Although the reaction product and the wetting angle were studied in details, the relationship between wettability and interface reaction was not clarified in [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon on wettability and interface reaction between melt superalloy and ceramic material

Chen

Zhou

Jin

et al. 2014

MATEC Web of Conferences

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Abstract. Effect of C on wettability and interface reaction between a nickel based superalloy and ceramic material was investigated by using a sessile drop method. It was found that the content of C in the alloy is able to influence the wettability and interface reaction. Alloys with C content lower than 0.1wt.% are stable on ceramic material and no interface reaction generates at the alloy-ceramic interface. However, when C content is higher than 0.1wt.%, the interface reaction occurs and the wetting angle decreases quickly. The product of interface reaction is discontinuous and composed of 9Al 2 O 3 · Cr 2 O 3 . Such result indicates that Cr in the alloy is impossible to react with the ceramic material and form Cr 2 O 3 without the assistance of C. It is suggested that C in the alloy deoxidizes SiO 2 in the ceramic material and produces SiO and CO. SiO is unstable and it can release active O atom at the interface. Cr at the interface combines with free O atom and forms Cr 2 O 3 . Al 2 O 3 in the ceramic material and Cr 2 O 3 finally forms 9Al 2 O 3 · Cr 2 O 3 .

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Understanding the formation process of shrinkage pores with a 3D dendrite growth model: from casting to additive manufacturing

Yan

Feng

2021

Comput Mech

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Pore formation in single-crystal turbine rotor blades during directional solidification

Cited by 18 publications

References 1 publication

Tracking pores during solidification of a Ni-based superalloy using 4D synchrotron microtomography

Tracking pores during solidification of a Ni-based superalloy using 4D synchrotron microtomography

Effect of carbon on wettability and interface reaction between melt superalloy and ceramic material

Understanding the formation process of shrinkage pores with a 3D dendrite growth model: from casting to additive manufacturing

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