Benefits of high gradient solidification for creep and low cycle fatigue of AM1 single crystal superalloy

Steuer, S.; Villechaise, Patrick; Pollock, Tresa M.; Cormier, Jonathan

doi:10.1016/j.msea.2015.07.045

Cited by 91 publications

(36 citation statements)

References 33 publications

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“…This is in agreement with VHCF results obtained at room temperature on SX [38] and DS alloys. [39] It appears that the smaller the pore size is, the higher the VHCF life [see Figure 3(b) focused on AM1 and MCNG alloys], which is in agreement with previous studies done in the LCF [18,20,21] and HCF [18,19] regimes when environment has (almost) no impact. Since the casting pore size in the specimen volume (and more specifically, the tail of the pore size distribution toward larger sizes) is directly connected to the solidification process, [22] then the LMC solidification process shows a high improvement in the VHCF life in comparison to the Bridgman one.…”

Section: Discussionsupporting

confidence: 90%

“…[9,21] This model adapts the fatigue indicator parameter (FIP) [41] that considered the stress intensity factor close to the crack initiation site:…”

Section: Discussionmentioning

confidence: 99%

“…[43] r is the applied positive stress and A defect the area of the pore measured on the fracture surface from the equivalent diameter method. [21] The FIP has been calculated for all tested materials and for each specimen exhibiting a single internal crack initiation from a pore. The Young's modulus and the highest Schmid factor used to calculate the FIP take into consideration the primary misorientation of each specimen.…”

Section: Discussionmentioning

confidence: 99%

“…[18][19][20][21] One aim of this study was to investigate the impact of the pore size on the VHCF properties using three AM1 and two MCNG materials processed differently. Table I presents the size range of the casting pores that acted as crack initiation sites for these alloys, and also for the other ones.…”

Section: Casting Defects and Chemical Heterogeneitiesmentioning

confidence: 99%

“…Table I presents the size range of the casting pores that acted as crack initiation sites for these alloys, and also for the other ones. Pore size is defined by the surrounding diameter method [21] and was directly measured on the fracture surfaces.…”

Section: Casting Defects and Chemical Heterogeneitiesmentioning

confidence: 99%

See 4 more Smart Citations

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

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Cormier

Mauget

et al. 2018

Metall Mater Trans A

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Section: Discussionsupporting

confidence: 90%

“…[9,21] This model adapts the fatigue indicator parameter (FIP) [41] that considered the stress intensity factor close to the crack initiation site:…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Casting Defects and Chemical Heterogeneitiesmentioning

confidence: 99%

Section: Casting Defects and Chemical Heterogeneitiesmentioning

confidence: 99%

See 3 more Smart Citations

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Cervellon

Cormier

Mauget

et al. 2018

Metall Mater Trans A

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On the Effect of Hot Isostatic Pressing on the Creep Life of a Single Crystal Superalloys

et al. 2016

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The creep behavior of a single-crystal Ni-base superalloy in two microstructural states is compared. One is obtained by casting followed by a conventional heat treatment. The other results from the same nominal heat treatment integrated into a hot isostatic pressing process. The microstructure after HIP differed from that in the conventional route in two respects. First, the g 0 particles are smaller and the g channels are narrower. Second, after HIP, the number density of pores is lower and the pore sizes are smaller. The HIP microstructure improves creep in two respects: the finer g/g 0 -microstructure results in lower minimum creep rates. Moreover, the shrinkage of cast porosity during HIP delays the nucleation and growth of micro cracks and results in higher rupture strains in the low-temperature high stress regime.

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Variation of Homogenization Pores during Homogenization for Nickel‐Based Single‐Crystal Superalloys

et al. 2021

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The porosity deteriorates the mechanical properties of nickel‐based superalloys, especially the fatigue properties. Herein, the kinetics model of homogenization porosity growth is optimized. The corresponding diffusion processes during solution heat treatment are simulated by the DICTRA software and verified by experiments. The results show that the homogenization porosity increases first and then decreases during the solution heat treatment, due to the imbalanced diffusion flux between dendritic core (DC) and interdendritic areas (IAs). The diffusion flux first flows toward DC and then toward IAs after fully homogenization of the fast diffusion elements. Moreover, the influence of directional solidification parameters on the homogenization porosity process is investigated. With the increase in the withdraw rate, the dendritic structure is refined, and the S‐porosity decreases. Meanwhile, the dendritic arm spacing decreases; thus, homogenization accelerated increases. In this case, after the solution heat treatment, the homogenization porosity decreases. The results provide two bases to propose a new method to control the homogenization porosity.

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Benefits of high gradient solidification for creep and low cycle fatigue of AM1 single crystal superalloy

Cited by 91 publications

References 33 publications

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

Very High Cycle Fatigue of Ni-Based Single-Crystal Superalloys at High Temperature

On the Effect of Hot Isostatic Pressing on the Creep Life of a Single Crystal Superalloys

Variation of Homogenization Pores during Homogenization for Nickel‐Based Single‐Crystal Superalloys

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