Hot tearing susceptibility of aluminum alloys using CRCM-Horizontal mold

Akhyar, Akhyar; Malau, Viktor; Suyitno, Suyitno; Iswanto, Priyo Tri

doi:10.1016/j.rinp.2017.02.041

Cited by 25 publications

(11 citation statements)

References 21 publications

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“…In the second version of the equation [ 28 , 29 , 30 , 31 ], the HTI 2 value depends on the hot tear position on the test arm (“tear position”—TP), the length of the test arm (“arm length”—AL) and on the nature and size of the hot tear (“weighting factor”—WF). HTI 2 is defined as: HTI 2 = ∑ WF × TP × AL …”

Section: Methodsmentioning

confidence: 99%

Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy

et al. 2021

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The main reason for the use of returnable material, or recycled alloys, is a cost reduction while maintaining the final properties of the casting. The casting resulting quality is directly related to the correct ratio of commercial grade alloy and alloy made by remelting the returnable material in the batch. The casting quality is also affected by the purity of the secondary raw materials used, the shape complexity and the use of the casting itself. The presented article focuses on the effect of increasing the returnable material content in the batch on the hot tearing susceptibility of AlSi9Cu3 alloy. Hot tears are a complex phenomenon that combines metallurgical and thermo-mechanical interactions of the cast metal. Hot tearing susceptibility was evaluated on the basis of quantitative (HTS—hot tearing susceptibility index) and qualitative evaluation. The negative effect of returnable material in the batch was already manifested at a 20% content in the batch. The critical proportion of the returnable alloy in the batch can be stated as 50%. The alloy with a 50% returnable material content manifested insufficient results of the HTS index and qualitative evaluation, which means increased sensitivity to tearing. The negative effect of returnable material and the increased sensitivity were also confirmed in the evaluation of the fracture surface and hot tear profile. The microstructure of alloys with 50% and higher proportion of returnable material was characterized by a higher amount of iron phases (mainly Al5FeSi), whose sharp ends acted as critical regions of hot tearing and subsequent hot tear propagation, which had a major impact on the increase in hot tearing susceptibility.

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Section: Methodsmentioning

confidence: 99%

Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy

et al. 2021

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“…The Al-1.37Zn-1.19Si alloy has lower index, it is 36,2 BHN. Primary silicon appear in Al-1.66Si-1.35Zn alloy spread evenly on the entire surface of microstructure, while for Al-1.37Zn- 1.19Si primary silicon present alloy accumulate in the middle of microstructure Figure 5a [18] . Hardness values also seen higher in Al-1.66Si-1.35Zn alloys when compared with to Al-1.37Zn-1.19Si alloys, this is influenced by the silicon distribution in cast-sample.…”

Section: Hardness and Microstucturementioning

confidence: 97%

Cooling Rate, Hardness and Microstructure of Aluminum Cast Alloys

Akhyar

2018

Mater Sci Mater Rev

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This experiment investigated the cooling curve behavior, hardness and microstructure of two aluminum alloys produced by casting process. There are Al-1.37Zn-1.19Si and Al-1.66Si-1.35Zn derived from melting and alloying a pure aluminum with ADC12 (Al-Si) ingot. Cooling curve recorded from both those two alloys with pouring temperature at 710 oC and the mold temperature kept constant at 220 oC. The result shows, a freezing range of Al-1.37Zn-1.19Si alloy is 643–348 oC and Al-1.66Si-1.35Zn alloy is 621–401 oC. Then cooling rate obtained for Al-1.37Zn-1.19Si is 55.56 oC/S, and Al-1.66Si-1.35Zn is 30.09 oC/S. TThe higher hardness is 40.42 BHN at Al 1.66 Si-1.35Zn, while the lower value is 34.62 BHN on Al-1,37Zn-1,19Si alloy. The hardness value found higher when cooling rate is shorted. The number of silicon present on microstructure is highest in Al-1.37Zn-1.19Si alloy but the hardness value decreases. This is caused by the distribution of the silicon content in the alloy is irregular. It was found that the solidification rate had an effect on hardness, where the freezing rate obtained a high hardness value.

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“…Moreover, the cylindrical rods were separated from each other at an angle of 60°. The molten metal was also fed to the rod through a vertical sprue with a height and diameter of 60 and 29 mm, respectively [24, 43,94]. Fig.…”

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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Hot tearing susceptibility of aluminum alloys using CRCM-Horizontal mold

Cited by 25 publications

References 21 publications

Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy

Effect of Returnable Material in Batch on Hot Tearing Tendency of AlSi9Cu3 Alloy

Cooling Rate, Hardness and Microstructure of Aluminum Cast Alloys

Archives of Foundry Engineering

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