Modeling of De-cohesion and the Initiation of Hot Tearing in Coherent Mushy Zones of Metallic Alloys

Mihanyar, Shifteh; Mo, Asbjørn; M’Hamdi, M.; Ellingsen, Kjerstin

doi:10.1007/s11661-010-0581-z

Cited by 12 publications

(3 citation statements)

References 17 publications

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“…represent the softening effect of the liquid in the form of pockets, while the softening effect due to the existing of the liquid films at grain boundaries is considered by the internal variable C. The alloy-dependent parameter C can be determined by rheological experiments. Recently, an additional internal variable D was introduced into this model to account for the opening up, decohesion of the solid skeleton which is related to the initiation of hot tears during semi-solid tensile tests [147]. The relevant semi-solid constitutive parameters for this viscoplastic model of Al-Cu [21], AA5182 [20], AA6061 [34], AA7050 [8] alloys have been reported by researchers.…”

Section: The Viscoplastic Based Constitutive Equationmentioning

confidence: 99%

Recent advances in hot tearing during casting of aluminium alloys

Katgerman

et al. 2021

Progress in Materials Science

121

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Hot tearing is one of the most severe and irreversible casting defects for many metallic materials. In 2004, Eskin et al. published a review paper in which the development of hot tearing of aluminium alloys was evaluated . Sixteen years have passed and this domain has undergone considerable development. Nevertheless, an updated systematic description of this field has not been presented. Therefore, this article presents the latest research status of the hot tearing during the casting of aluminium alloys. The first part explains the hot tearing phenomenon and its occurrence mechanism. The second part presents a detailed description and analysis of the characterisation methods of the mushy zone mechanical properties and hot tearing susceptibility. The third part presents considerable data pertaining to the mushy zone behaviour, including those of the linear contraction and load behaviour during solidification, semi-solid strength and ductility, and characteristic points related to hot tearing. The fourth part examines the effect of the composition and casting process parameters on the hot tearing susceptibility of aluminium alloys. The fifth part describes the hot tearing simulations and the associated criteria and mechanisms. Finally, recommendations for the further development of hot tearing research are presented.

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Section: The Viscoplastic Based Constitutive Equationmentioning

confidence: 99%

Recent advances in hot tearing during casting of aluminium alloys

Katgerman

et al. 2021

Progress in Materials Science

121

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“…However, Figures 5(a) through (c) and also other works on the tensile semi-solid constitutive behavior of aluminum alloys [28,29] show that the damage development phase (the decrease in force value after the peak is reached) is also important because it is directly linked to the propagation of the formed HT. Therefore, an implementation of the damage development model, for instance, the de-cohesion model developed by Mihanyar et al, [48] would be an ideal pathway for further ALSIM model development.…”

Section: Alsim Numerical Modelmentioning

confidence: 99%

Semi-solid Constitutive Parameters and Failure Behavior of a Cast AA7050 Alloy

Subroto

Eskin

Miroux

et al. 2021

Metall Mater Trans A

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AA7050 is an aluminum alloy with superior mechanical properties; however, it is prone to hot tearing (HT) during its production via direct-chill casting. This study focuses on extracting constitutive parameters of the alloy thermomechanical behavior in semi-solid state as well as gaining insight in its failure behavior. Tensile tests were performed using an Instron 5944 at solid fractions between 0.85 (550°C) and 1.0 (465°C), at deformation rates of 0.2 and 2 mm/ min. The results showed that there are three mechanical behavior regimes in this solid fraction range: ductile at 1.0 (T = 465°C) £ f s <0.97 (T = 473°C), brittle at 0.97 (T = 473°C) £ f s £ 0.9 (T = 485°C) and then ductile again (at 0.9 (T = 485°C) < f s £ 0.85 (T = 550°C)). Fracture surface analysis revealed that the fracture mode was mostly intergranular with fracture propagating through solid bridges as well. Semi-solid constitutive parameters were obtained by making a simple thermal model and numerical tensile tests in ALSIM software package and comparing the simulation results with experimental mechanical tests. The extracted constitutive parameters and available information from the literature support the fact that AA7050 is more susceptible to HT than AA5182 and Al-2 wt pct Cu alloys. The obtained parameters can further enhance the predictive capability of computer simulations of direct-chill casting.

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“…, where 99 , 90 and 40 are the times when fs=0.99, fs=0.90 and fs=0.40, respectively. Similar criteria were developed using different critical solid fractions simulating feeding [39][40][41] [42] and later associating the solidification crack initiation to the mushy zone decohesion [43].…”

Section: Crack Initiationmentioning

confidence: 99%

Effect of weld travel speed on solidification cracking behavior. Part 3: modeling

Coniglio

Cross

2020

Int J Adv Manuf Technol

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Solidification cracking is a weld defect common to certain susceptible alloys rendering many of them unweldable. It forms and grows continuously behind a moving weld pool within the twophase mushy zone and involves a complex interaction between thermal, metallurgical and mechanical factors. Research has demonstrated the ability to minimize solidification cracking occurrence by using appropriate welding parameters. Despite decade's long efforts to investigate weld solidification cracking, there remains a lack of understanding regarding the particular effect of travel speed. While the use of the fastest welding speed is usually recommended, this rule has not always been confirmed on site. Varying welding speed has many consequences both on stress cells surrounding the weld pool, grain structure, and mushy zone extent. Experimental data and models are compiled to highlight the importance of welding speed on solidification cracking. This review is partitioned into three parts: Part I focuses on the effects of welding speed on weld metal characteristics, Part II reviews the data of the literature to discuss the importance of selecting properly the metrics, and Part III details the different methods to model the effect of welding speed on solidification cracking occurrence.

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Modeling of De-cohesion and the Initiation of Hot Tearing in Coherent Mushy Zones of Metallic Alloys

Cited by 12 publications

References 17 publications

Recent advances in hot tearing during casting of aluminium alloys

Recent advances in hot tearing during casting of aluminium alloys

Semi-solid Constitutive Parameters and Failure Behavior of a Cast AA7050 Alloy

Effect of weld travel speed on solidification cracking behavior. Part 3: modeling

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