Orientation Characteristics of Single Crystal Superalloys with Different Preparation Methods

Chao, Yang; Liu, Lin; Luo, Ning; Han, Bo; Zhang, Xiaolian; Zhang, Jun; Fu, Hengzhi

doi:10.1016/s1875-5372(17)30121-2

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…In order to accurately predict defects and post-solidification properties and elucidate solidification conditions, computational models of various solidification processes have been developed. At present, the grain formation including nucleation, competitive growth and growth of grains for single crystal superalloy during solidification has been obtained by numerical simulation [2][3][4]. The other important aspect of numerical simulation investigation is the defects during solidification in single crystal superalloy castings.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Grain Formation and Defects during Solidification in Single Crystal Superalloy Castings

Jin

Liu

Xie

et al. 2021

MSF

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Numerical simulation and prediction of grain formation and defects, including the stray grain and high angle orientation deviation during directional solidification process of a single crystal superalloy hollow turbine blade are experimentally conducted by means of commercial software ProCAST and backscattering scanning electron microscope. The results show that the initial nucleation amount at the beginning section of the starter block is 104 of magnitude, and the number of grains decreases gradually with the competitive growth, and the number is about 100 at the spiral of the selector. And the orientation distribution of grains is close to <001> direction, with the orientation deviation between 10° and 15°. Moreover, with the increase of withdrawal rate, the curvature of isoline of liquidus of single crystal blade increases, and the tendency to form stray grains defects increases. The grain with a large deviation from orientation blocks the growth of other grains at the first rotating transition site of the selector, and then gradually grows and solidifies to form the final blade.

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Section: Introductionmentioning

confidence: 99%

Prediction of Grain Formation and Defects during Solidification in Single Crystal Superalloy Castings

Jin

Liu

Xie

et al. 2021

MSF

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“…Crystal orientation is commonly detected by electron backscattered diffraction (ESBD) and X‐ray diffraction by measuring the deviation angle from the preferred [001] growth direction . Generally, the grains with deviation angle less than 10° are considered as well‐oriented grains .…”

Section: Introductionmentioning

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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Optimizing Grain Selection Design in the Single‐Crystal Solidification of Ni‐Based Superalloys

Sadeghi

Kermanpur

Norouzi‬

2018

Crystal Research and Technology

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An attempt is made to model the design of grain selection during single‐crystal solidification of an Ni‐based superalloy by the Bridgman method. Various geometrical designs of the starter block and spiral grain selector are chosen and their effects on crystal orientation of the single‐crystal part are studied. The competitive grain selection is simulated utilizing the cellular automaton finite element module of the ProCAST software. The simulated results are validated against the experimental observation of grain structure along with the crystal orientation measured by the electron backscatter diffraction (EBSD) and rotational orientation X‐ray diffraction (RO‐XRD) techniques. The results show that in order to obtain the single crystal with a minimum deviation from longitudinal axis, the height and diameter of the starter block as well as the height and the take‐off angle of the spiral should be optimized. It is found that the diameter/height ratio of the starter block should be less than 0.6 to obtain a well‐oriented single crystal prior to entrance of solidification front into the spiral. The height of starter block is found to be more influential than its diameter in selecting the suitable single grain.

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Orientation Characteristics of Single Crystal Superalloys with Different Preparation Methods

Cited by 4 publications

References 15 publications

Prediction of Grain Formation and Defects during Solidification in Single Crystal Superalloy Castings

Prediction of Grain Formation and Defects during Solidification in Single Crystal Superalloy Castings

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

Optimizing Grain Selection Design in the Single‐Crystal Solidification of Ni‐Based Superalloys

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