On the statistical distribution of primary and secondary dendrite arm spacing in cast metals

Tiryakioğlu, Murat

doi:10.1080/02670836.2018.1563982

Cited by 7 publications

(5 citation statements)

References 18 publications

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“…In the literature, a significant amount of steady state solidification work is reported that characterises the relationship between primary spacing, alloy composition, C 0 , thermal gradient, G, and tip growth velocity, V [33][34][35][36][37][38][39][40][41]. In directional solidification, the G and V can be independently controlled, so one may study the dependence of λ 1 , on either G (at constant V) or V (at constant G).…”

Section: Introductionmentioning

confidence: 99%

On Directional Dendritic Growth and Primary Spacing—A Review

2020

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The primary spacing is intrinsically linked with the mechanical behavior of directionally solidified materials. Because of this relationship, a significant amount of solidification work is reported in the literature, which relates the primary spacing to the process variables. This review provides a comprehensive chronological narrative on the development of the directional dendritic growth problem over the past 85 years. A key focus within this review is detailing the relationship between key solidification parameters, the operating point of the dendrite tip, and the primary spacing. This review critiques the current state of directional dendritic growth and primary spacing modelling, briefly discusses dendritic growth computational and experimental research, and suggests areas for future investigation.

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Section: Introductionmentioning

confidence: 99%

On Directional Dendritic Growth and Primary Spacing—A Review

2020

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“…Regrettably, these structures often prove resilient even when subjected to thermal-mechanical treatments such as forging, rolling, and heat treatment. Consequently, a well-established body of research exists dedicated to exploring the relationship between dendritic structures and the properties of materials [1][2][3][4][5][6][7][8][9][10][11]. Secondary dendrite arm spacing (SDAS, λ 2 ) is commonly used to observe casting and the ensuing manufacturing processes, primarily due to its significant influence on the mechanical and magnetic characteristics of magnetic alloys [3].…”

Section: Introductionmentioning

confidence: 99%

“…For example, alloy or trace element adding can reduce the size of SDAS [1,2]; local solidification time is crucial for the cooling rates and affects the SDAS size and distribution of casting alloys [5]. Besides, many methods have been investigated to reasonably determine the SDAS and its relation to the properties of materials [8,10,11]. Concurrently, SDAS is intricately associated with the solidification mechanisms [3,4], growth patterns [7,9], and distribution of solute, inclusions, and interfacial phases within the material matrix.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Heterogeneity and Property Variations in Cast and Vacuum Hot-Pressed CoCrPtB Alloy

Li,

Guan,

Wen

et al. 2024

Materials

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Limited research has been undertaken regarding the homogeneity of CoCrPtB alloy billets. A CoCrPtB alloy was processed through casting and vacuum hot pressing. This investigation delved into the interconnection between the secondary dendrite arm spacing (SDAS) in the as-hot-pressed samples and their corresponding attributes, specifically Vickers hardness and magnetic properties. Systematic sampling was conducted on the cross-sectional layer and longitudinal surface. Upon examination of the cross-sectional layer proximate to the uppermost region of the hot casting, a discernible parabolic trend was observed for the SDAS that exhibited a gradual increment from the peripheral regions toward the central area along the width. Simultaneously, the fraction of the dendrite phase displayed a consistent linear decline, attaining its peak value at the central portion of the billet. Conversely, on the longitudinal surface, SDAS and the fraction of the dendrite phase remained fairly uniform within the same column sampling regions. However, a notable divergence was identified in the central section, characterized by an augmented SDAS and diminished dendrite phase content. This inherent microstructural inhomogeneity within the CoCrPtB alloy engendered discernible disparities in material properties.

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“…Classical methods to determine the average [ 11 , 12 , 13 ] and local [ 14 , 15 , 16 , 17 , 18 , 19 ] PDAS, all require laborious manual determination of the dendrite cores. The manual counting process takes approximately 20 min to 1.5 h depending on the size of the sample surface and number of dendrites.…”

Section: Introductionmentioning

confidence: 99%

Automatic Recognition of Dendritic Solidification Structures: DenMap

et al. 2020

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Dendrites are the predominant solidification structures in directionally solidified alloys and control the maximum length scale for segregation. The conventional industrial method for identification of dendrite cores and primary dendrite spacing is performed by time-consuming laborious manual measurement. In this work we developed a novel DenMap image processing and pattern recognition algorithm to identify dendritic cores. Systematic row scan with a specially selected template image over an image of interest is applied via a normalised cross-correlation algorithm. The DenMap algorithm locates the exact dendritic core position with a 98% accuracy for a batch of SEM images of typical as-cast CMSX-4® microstructures in under 90 s per image. Such accuracy is achieved due to a sequence of specially selected image pre-processing methods. Coupled with statistical analysis the model has the potential to gather large quantities of structural data accurately and rapidly, allowing for optimisation and quality control of industrial processes to improve mechanical and creep performance of materials.

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On the statistical distribution of primary and secondary dendrite arm spacing in cast metals

Cited by 7 publications

References 18 publications

On Directional Dendritic Growth and Primary Spacing—A Review

On Directional Dendritic Growth and Primary Spacing—A Review

Microstructural Heterogeneity and Property Variations in Cast and Vacuum Hot-Pressed CoCrPtB Alloy

Automatic Recognition of Dendritic Solidification Structures: DenMap

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