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Hot Tearing Elimination at DC-casting of Al Alloys

Reference number
Coordinator Mittuniversitetet - Avdelningen för naturvetenskap
Funding from Vinnova SEK 1 795 500
Project duration October 2017 - December 2018
Status Completed
Venture The strategic innovation programme for Metallic material

Purpose and goal

Hot tearing in AA3003 alloys have been studied in laboratory and in industrial scale in the companies Kubal and Gränges. Aim with the project is to decrease the scrap rate due hot tearing for certain alloys from levels of 25 to 30% down to levels normal for other Al alloys which is about 5%. After the project the scrap rate has been lowered to about 10%. Another aim is to obtain quantitative data for the crack tendency after alloying with certain alloy additions, and such data is now available.

Expected results and effects

An expected and clear result from the experimental work was that decreased cooling rate lowers the crack sensitivity. In industrial trials a new design of the moulds was necessary to achieve a more even and decreased cooling rate, which also improved the casting yield. The most important results from the studies of different alloy compositions was that Cu contents higher than 0.3% increased the crack rate and so did the lowering of the Fe content from the normal 0.2% to 0.14%.

Planned approach and implementation

CRC, i.e. Constrained rod Casting, have been applied to study hot tearing for creation, AA3003, aluminum alloys. Acoustic emission has been applied to obtain more accurate data, however, with no success. SEM has been used to analyze fracture surfaces and for in-situ studies of crack growth. DC simulation equipment has been used to manufacture alloys of compositions not available in the industrial partner companies.

The project description has been provided by the project members themselves and the text has not been looked at by our editors.

Last updated 5 February 2019

Reference number 2017-02823

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