Effect of orientation on the microstructure of nickel‐based crystalline superalloys

Zhao, XiaoBin; Liu, L.; Gao, Sifeng; Bingming, Ge; Zhang, Jun; Li, Y. L.; Fu, Hengzhi

doi:10.1002/crat.201100391

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Primary dendritic arm spacing (PDAS) is also found to be another feature which is sensitive to the SX orientation on both [001] (preferential) and [011] (non‐preferential). It is identified that a decrease in PDAS results in increased misorientation . While selecting the optimum value of withdrawal rate, shape factor of the casting cannot be avoided.…”

Section: Resultsmentioning

confidence: 99%

Grain Selection and Crystal Orientation in Single‐Crystal Casting: State of the Art

Raza

Wasim

Hussain

et al. 2019

Crystal Research and Technology

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The properties of single‐crystal superalloys depend highly upon crystallographic orientation and the selection of single crystal (SX) in directional solidification (DS) process. The assessment of SX selection and crystallographic orientation determines the mechanical properties of the casting. Generally, it is considered that the deviation from [001] orientation should be less than 10° for better mechanical properties. This article provides a quantitative literature review analyzing the experimental results of 30 papers that studied the effects of process parameters on crystal orientation and grain selection in SX‐casting process. Key parameters that control the SX casting during DS process include spiral selector parameters, starter block parameters, withdrawal rate, pouring temperature, and ceramic mold temperature. The analysis in this research provides a strong evidence to assist the standard operating range of each parameter. A lack of focus in the literature on alloys is found. A framework based on the key parameters is also proposed in this review.

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Section: Resultsmentioning

confidence: 99%

Grain Selection and Crystal Orientation in Single‐Crystal Casting: State of the Art

Raza

Wasim

Hussain

et al. 2019

Crystal Research and Technology

View full text Add to dashboard Cite

show abstract

“…They also mentioned an independent behavior of crystal orientation to its initial withdrawal rate so that the misorientation of the single crystal remains unchanged for the constant 50 μm/s or after transition from higher rates . The variation of PDAS is another feature that is found to be sensitive to the orientation of single crystal on both [001] preferential and [011] non‐preferential directions such that, PDAS has a declining trend with increasing misorientation . However, the effect of increasing transition of withdrawal rate on the mechanism of changing misorientation in single crystals is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Effect of withdrawal rate transition on microstructural features of a single crystal Ni‐based superalloy

Sadeghi

Kermanpur

Heydari

et al. 2017

Crystal Research and Technology

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The effect of withdrawal rate transition during Bridgman directional solidification on microstructural aspects of a single crystal Ni-based superalloy was investigated under both constant and changing withdrawal regimes. Variations of primary and secondary dendrite arm spacing (PDAS and SDAS, respectively) and crystal orientation were investigated using optical microscopy and electron backscattered diffraction (EBSD) techniques. The results showed a gradual decreasing trend in PDAS and SDAS by sudden increasing of withdrawal rate. Changes on PDAS was quantified as history-dependent such that for a given secondary withdrawal rate, a higher PDAS was found for a lower initial withdrawal rate. The withdrawal rate transition showed a direct influence on crystal orientation.

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Effect of sample size on intermetallic Al2Cu microstructure and orientation evolution during directional solidification

Gao

2014

Journal of Crystal Growth

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Effect of orientation on the microstructure of nickel‐based crystalline superalloys

Abstract: The effect of crystal orientation on the microstructure of a nickel-based crystalline superalloys during directional solidification was explored.

Cited by 3 publications

References 16 publications

Grain Selection and Crystal Orientation in Single‐Crystal Casting: State of the Art

Grain Selection and Crystal Orientation in Single‐Crystal Casting: State of the Art

Effect of withdrawal rate transition on microstructural features of a single crystal Ni‐based superalloy

Effect of sample size on intermetallic Al2Cu microstructure and orientation evolution during directional solidification

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