Strengthening of oxidation-resistant Fe-Cr-Al-Y alloys by directional solidification of eutectic compositions

Quested, P N; Miles, D. E.; McLean, M.

doi:10.1179/030716980803287161

Cited by 6 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of the present work showed that the secondary dendrite arm spacing adjacent to the FZ boundary in the laser arc hybrid welded IN738 superalloy was 3·89±0·41 μm. A relationship between the secondary dendrite arm spacing d , and the cooling rate in the FZ has been expressed as27,28 where R is the cooling rate, and K and n are constants, experimentally determined as 4·7×10 −2 K 1/3 S −1/3 and −0·4 respectively, for IN738 superalloy 28. Using this approach, the cooling rate within the FZ of the laser arc hybrid welded IN738 superalloy was estimated to be ∼501°C s −1 .…”

Section: Resultsmentioning

confidence: 99%

“…27 The results of the present work showed that the secondary dendrite arm spacing adjacent to the FZ boundary in the laser arc hybrid welded IN738 superalloy was 3?89¡0?41 mm. A relationship between the secondary dendrite arm spacing d, and the cooling rate in the FZ has been expressed as 27,28 d~KR n (1…”

Section: Fusion Zone Characteristics: Dendritic Microstructure Elemen...mentioning

confidence: 99%

“…where R is the cooling rate, and K and n are constants, experimentally determined as 4?7610 22 K 1/3 S 21/3 and 20?4 respectively, for IN738 superalloy. 28 Using this approach, the cooling rate within the FZ of the laser arc hybrid welded IN738 superalloy was estimated to be y501uC s 21 . A similar estimation for a bead on plate fibre laser welded IN738 superalloy that was welded with the same laser power (4 kW) showed that the cooling rate within the FZ was y813uC s 21 .…”

Section: Fusion Zone Characteristics: Dendritic Microstructure Elemen...mentioning

confidence: 99%

See 2 more Smart Citations

Laser arc hybrid weld microstructure in nickel based IN738 superalloy

Ola

Ojo

Chaturvedi

2013

Materials Science and Technology

View full text Add to dashboard Cite

A study of the microstructural characteristics of laser arc hybrid welded nickel based IN738 superalloy was performed. Laser arc hybrid welding produced a desirable weld profile in the alloy, similar to what is usually obtained during laser beam welding, and no cracking occurred exclusively in the fusion zone. Elemental partitioning pattern in the fusion zone was studied by electron probe microanalysis and calculating the volume fraction of the weld metal that resulted from the consumption of the filler wire. The result showed that Ti, Ta, Nb, Mo, Al and Zr partitioned into the interdendritic regions of the fusion zone. SEM and TEM examination of the fusion zone showed the presence of secondary solidification reaction constituents, which consists of MC type carbides. The study further revealed that non-equilibrium liquation of various second phases that were present in the alloy prior to welding contributed to intergranular liquation in the heat affected zone (HAZ), which consequently resulted in extensive HAZ intergranular cracking during welding. Although laser arc hybrid welding appears promising for improving the weldability of nickel based IN738 superalloy, a suitable weldability improvement procedure is required in order to minimise HAZ intergranular cracking and thereby enhance the applicability of this technology to the joining of the superalloy.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Fusion Zone Characteristics: Dendritic Microstructure Elemen...mentioning

confidence: 99%

Section: Fusion Zone Characteristics: Dendritic Microstructure Elemen...mentioning

confidence: 99%

See 1 more Smart Citation

Laser arc hybrid weld microstructure in nickel based IN738 superalloy

Ola

Ojo

Chaturvedi

2013

Materials Science and Technology

View full text Add to dashboard Cite

show abstract

“…On the one hand, it is difficult to observe the evolution of solidification in real time in a common SX casting process. On the other hand, a numerical simulation can offer copious valuable information, such as the evolution of the temperature field during solidification, and it can dramatically reduce the time and experimental cost required to optimize the solidification process [26][27][28][29][30][31][32][33][34][35][36][37]. Therefore, this study adopted the software ProCAST-2017 [38] to analyze the grain selection process in the SX casting process.…”

Section: Numeral Simulationmentioning

confidence: 99%

A Study of Grain Selection in Two-Dimensional (2D) Grain Selectors during the Investment Casting of Single-Crystal Superalloy

Zhu

Wang

2023

Materials

View full text Add to dashboard Cite

In this study, a series of Bridgman casting experiments were conducted to study the physical processes occurring in 2D grain selectors with different geometric parameters. The corresponding effects of the geometric parameters on grain selection were quantified by using an optical microscopy (OM) and a scanning electronic microscopy (SEM) equipped with electron backscatter diffraction (EBSD) function. Based on the results, the influences of the geometric parameters of the grain selectors are discussed, and an underlying mechanism accounting for the experimental results is proposed. The critical nucleation undercooling in the 2D grain selectors during grain selection was also analyzed.

show abstract

“…For example, Quested et al 40 have measured values of η of 4-5,6 and 18 at temperatures of 950,820 and 700 °C and an unrealistically high value of 800 to 1200 kJ mole -1 for the activation energy in the (Fe, Cr, Al, Y)-Cr 7 C 3 composite. For example, an activa- tion energy close to that of the matrix would occur in a composite with poor interphase bonding.…”

Section: F +V M +V B = Lmentioning

confidence: 99%

Production, properties and uses of in-situ composites and metallic glasses

Elliott¹

1983

Eutectic Solidification Processing

View full text Add to dashboard Cite

Strengthening of oxidation-resistant Fe-Cr-Al-Y alloys by directional solidification of eutectic compositions

Cited by 6 publications

References 7 publications

Laser arc hybrid weld microstructure in nickel based IN738 superalloy

Laser arc hybrid weld microstructure in nickel based IN738 superalloy

A Study of Grain Selection in Two-Dimensional (2D) Grain Selectors during the Investment Casting of Single-Crystal Superalloy

Production, properties and uses of in-situ composites and metallic glasses

Contact Info

Product

Resources

About