Role of tensile forces in hot tearing formation of cast Al-Si alloy

Xu, Rongfu; Luo, Jie; Ding, Supei; Sanping, Zhang; Tian, Xuelei

doi:10.1016/s1003-6326(14)63333-1

Cited by 22 publications

(4 citation statements)

References 12 publications

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“…36b). Additionally, the casting chamber should be coated with graphite for accuracy, as the mould was then preheated with copper resistance wire wrapped at 100 mm [88]. Tube-Shaped Mould, Several studies have been carried out on the castability of samples having columnar grain structure, through tube-shaped mould freezing with visual observations of cast crack formations [89,90,91,92].…”

Section: Rig Hot Tearing This Was Developed By Istonementioning

confidence: 99%

Archives of Foundry Engineering

2022

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Hot tearing is a casting defect responsible for external and internal cracks on casting products. This irregular undesired formation is often observed during solidification and freezing. The solidification of molten metal also causes thermal contraction and shrinkage, indicating the occurrence of hot tearing when the alloy is restrained by the mould design. The parameters affecting this process include the pouring and mould temperatures, the chemical composition of the alloy, and the mould shape. Also, the factors affecting hot tearing susceptibility include pouring and mould temperatures, the grain refiner, as well as pouring speed. There are many methods of measuring the level of susceptibility to hot tearing, one of which is the thermal contraction evaluation during metal solidification, observed in cast products through several mould types. This paper discusses the hot tearing overview, the effect of pouring temperature, mould temperature, grain refiner, pouring speed on hot tearing, the type of mould, and criterion for hot tear observation.

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Section: Rig Hot Tearing This Was Developed By Istonementioning

confidence: 99%

Archives of Foundry Engineering

2022

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“…Aluminum and its alloys are lightweight, have excellent thermal and electrical conductivity, corrosion resistance, recyclability, and high strength to weight ratio, and are relatively easy to produce [1][2][3]. This has caused an increase in demand for cast and wrought aluminum alloy products during the last two decades.…”

Section: Introductionmentioning

confidence: 99%

The Start-Up Phase of Aluminum Billet Production Using Direct Chill Casting

Rajagukguk,

Suyitno,

Saptoadi

et al. 2024

AMM

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Direct chill (DC) casting has been considered as one of the promising casting methods that can be used to produce aluminum alloys billet. The process is conducted by pouring aluminum metal into a water-cooled mold. The billet shell begins to form when molten aluminum contact directly with the mold (this is also known as primary cooling). Afterward, the starting block is pulled downwards at a specified casting speed to achieve desired aluminum billet. The start-up phase during the DC casting process is considered a crucial step since it may determine the formation of defects in the casting products. This research aims to investigate the casting defects on the aluminum alloy that were formed during the start-up process of DC casting. The results show that the billet failed to form following the downward movement of starting block. Meanwhile, the billet tended to stick to the mold wall due to several factors, such as too low a pouring temperature, a less-round mold shape, the poor quality of the hot top and graphite ring, and the water that entered the mold during the casting process. It also noted several markers of the casting defects that occurred during the DC casting process such as liquation or bleeding, cold folding, billet stuck in the mold, butt structure, and rough billet surface.

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“…Since the 1940s, researchers have evaluated the hot tearing tendency of casting alloys by different experimental devices, and presented numerous mechanisms of hot tearing [7] . With the constant improvement of hot tearing testing devices, four kinds of devices have been widely used: equal-diameter devices, equal-length devices, "T"shaped bars, and active-load devices [8][9][10][11] . Sun et al [9] , using an equal-diameter hot device, found that the Al-Cu-Mg-Zn alloy with 5wt.% Cu, 4.5wt.% Mg and 2.5wt.% Zn has the lowest hot tearing tendency by observing macroscopic cracks.…”

mentioning

confidence: 99%

“…The experimental result was consistent with the numerical simulation according to the Clyne-Davies model. Xu et al [11,14] developed an active-load device to determine the effect of casting conditions on the hot tearing tendency of hypoeutectic Al-Si alloys, and summarized a hot cracking criterion based on the nominal yield stress. The numerical simulation technique was used to simulate the casting process of alloys and predict defects effectively [15][16][17][18] .…”

mentioning

confidence: 99%

Design and application of a multichannel “cross” hot tearing tendency device: A study on hot tearing tendency of Al alloys

Zheng

et al. 2022

China Foundry

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Against the background of the lightweight industry, the development of new aluminum alloys with high specific strength and low production cost is one of the main goals in modern industry. However, hot tearing is one of the most serious and irreparable defects in the production of thin-wall, complex and large castings of aluminum alloy, which limits the application of aluminum alloys [1][2][3] . Hot tearing is mainly attributed to insufficient feeding during solidification and the large-size thermal stress and strain at the end of solidification [4] . The fracture morphology shows that hot tearing usually occurs in the intergranular area, and the residual liquid or separated solid dendrite bridge is observed at the crack [4][5][6] .

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Role of tensile forces in hot tearing formation of cast Al-Si alloy

Cited by 22 publications

References 12 publications

Archives of Foundry Engineering

Archives of Foundry Engineering

The Start-Up Phase of Aluminum Billet Production Using Direct Chill Casting

Design and application of a multichannel “cross” hot tearing tendency device: A study on hot tearing tendency of Al alloys

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