Influence of Solute Content and Solidification Parameters on Grain Refinement of Aluminum Weld Metal

Schempp, Philipp; Cross, C. E.; Pittner, Andreas; Rethmeier, Michael

doi:10.1007/s11661-013-1649-3

Cited by 30 publications

(36 citation statements)

References 43 publications

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“…However, the increase in grain size observed at the highest Cu content used in the Al-Cu system by Birol 65 has not been observed by other authors 66 . An insightful approach by Schempp et al 67 related P to the columnar to equiaxed transition where it may be that the total supercooling is important, and Q to the grain size in the weld zones in Al-based alloys.…”

Section: Constitutional Supercooling and The Supercooling Parametmentioning

confidence: 99%

“…The grain size, dgs, for a wide range of alloys 45,68 and solidification conditions with different cooling rates 69,70 ranging from slowly cooled laboratory castings to high pressure die casting 71 , ultrasonic treatment of melts 7,49,72 , and welding 67 , can be related to Q through the relationship dgs = a + b/Q [5] where a and b are constants which depend upon the nucleant particle density, a, the nucleation undercooling, solute diffusion rate and growth velocity, b. It is surprising that this relationship also applies to non-equilibrium situations as Q is derived from equilibrium phase diagrams.…”

Section: Constitutional Supercooling and The Supercooling Parametmentioning

confidence: 99%

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The Contribution of Constitutional Supercooling to Nucleation and Grain Formation

StJohn

Prasad

Easton

et al. 2015

Metall Mater Trans A

148

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The concept of constitutional supercooling (CS) including the term itself was first described and discussed qualitatively by in order to understand the formation of cellular structures during the solidification of tin, and then quantified by Tiller, Jackson, Rutter, and Chalmers (1953). On that basis, Winegard and Chalmers (1954) further considered 'supercooling and dendritic freezing of alloys' where they described how CS promotes the heterogeneous nucleation of new crystals and the formation of an equiaxed zone. Since then the importance of CS in promoting the formation of equiaxed microstructures in both grain refined and unrefined alloys has been clearly revealed and quantified. This paper describes our current understanding of the role of CS in promoting nucleation and grain formation. It also highlights that CS, on the one hand, develops a nucleation-free zone surrounding each nucleated and growing grain and, on the other hand, protects this grain from readily remelting when temperature fluctuations occur due to convection. Further, due to the importance of the diffusion field that generates CS recent analytical models are evaluated and compared with a numerical model. A comprehensive description of the mechanisms affecting nucleation and grain formation and the prediction of grain size is presented with reference to the influence of the casting conditions applied during the practical casting of an alloy.

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Section: Constitutional Supercooling and The Supercooling Parametmentioning

confidence: 99%

Section: Constitutional Supercooling and The Supercooling Parametmentioning

confidence: 99%

The Contribution of Constitutional Supercooling to Nucleation and Grain Formation

StJohn

Prasad

Easton

et al. 2015

Metall Mater Trans A

148

View full text Add to dashboard Cite

show abstract

“…The premature collapse of the molten pool, mainly due to high speed, can lead to porosity and humps. Moreover, the rate of the way the length-to-width ratio is reduced, the shrinkage, and the local stresses developed in the surface allow the formation of cracks [23]. Modeling can provide a kind of relation between the process parameters and the existence or the susceptibility of a defect to occur.…”

Section: In-process Quality Assessment Of Laser Weldingmentioning

confidence: 99%

Quality assessment in laser welding: a critical review

Stavridis

Papacharalampopoulos

Stavropoulos

2017

Int J Adv Manuf Technol

182

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Quality assessment methods and techniques for laser welding have been developed both in-and post-process. This paper summarizes and presents relevant studies being classified according to the technology implemented (vision, camera, acoustic emissions, ultrasonic testing (UT), eddy current technique (ECT)) for the quality inspection. Furthermore, the current review aims to map the existing modeling approaches used to correlating measured weld characteristics and defects with the process parameters. Research gaps and implications of the quality assessment in laser welding are also described, and a future outlook of the research in the particular field is provided.

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“…Los granos del metal de soldadura tienden a nuclear en el metal base, asumiendo el mismo tamaño y orientación cristalina (nucleación epitáxica), por lo que los granos del metal de soldadura crecerán en dirección normal a la zona fundida (Schempp et al, 2013). Cada grano forma parte de una familia de granos, orientados todos en la misma dirección.…”

Section: Estructuras Asociadas Al Sub-enfriamientounclassified

Ciclo térmico y soldabilidad de las aleaciones de aluminio

2017

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RESUMEN:Las aleaciones de aluminio se caracterizan por su bajo peso y elevada resistencia mecánica, aunque no presentan buenas propiedades mecánicas cuando son soldadas mediante arco eléctrico a excepción de las aleaciones de la serie 5XXX y serie 6XXX. En este trabajo se realiza una revisión sobre el estado del arte del ciclo térmico y la soldabilidad de las aleaciones de aluminio, mostrando las diferentes reacciones de solidificación y la influencia que presenta la velocidad de enfriamiento en las aleaciones de aluminio representado mediante las curvas de enfriamiento, evaluando su influencia sobre las propiedades mecánicas de la unión soldada. ABSTRACT: Thermal cycle and weldeability of aluminum alloys. Aluminum alloys are characterized by low weight and high strength but has not good mechanical properties when they are welded by electric arc with the exception of the series alloys 5XXX and 6XXX. This paper makes a review on the state of the art thermal cycling and weldability of aluminum alloys, showing the different reactions and the solidification influence that presents the cooling rate on aluminum alloys represented by curves cooling, evaluating in this way its influence on the mechanical properties of the welded joint. INTRODUCCIÓNEl aluminio puro es el segundo metal más abundante en la corteza terrestre y se caracteriza por ser ligero, muy blando y dúctil, pero sobre todo mecánicamente muy poco resistente y por lo tanto sus propiedades no aportan valor estructural que pueda ser utilizado en la industria. Para poder aumentar la resistencia mecánica del aluminio se empezaron a desarrollar disoluciones sólidas con varios elementos de aleación hasta obtener el duraluminio. El duraluminio hace referencia a un conjunto de aleaciones que experimentan un envejecimiento natural a temperatura ambiente que provoca un aumento considerable de su resistencia mecánica lo que permite que sea REVISIÓN

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Influence of Solute Content and Solidification Parameters on Grain Refinement of Aluminum Weld Metal

Cited by 30 publications

References 43 publications

The Contribution of Constitutional Supercooling to Nucleation and Grain Formation

The Contribution of Constitutional Supercooling to Nucleation and Grain Formation

Quality assessment in laser welding: a critical review

Ciclo térmico y soldabilidad de las aleaciones de aluminio

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