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EN
Purpose: Aluminium AA5083 is commonly utilised in constructing ship hull shells, which are welded with aluminium AA6063 to act as stiffeners. However, the joints often suffer structural damage, such as longitudinal and transverse cracks in the dissimilar weld area, particularly in the Heat-Affected Zone (HAZ) of AA6063, which includes frames, brackets, and collars. To enhance the mechanical properties of AA6063, T6 heat treatment is commonly employed. The given study investigates the impact of temperature in artificial ageing during the T6 heat treatment on the microstructure and mechanical properties of the dissimilar materials welding between AA5083 and AA6063. Design/methodology/approach: The T6 heat treatment variations involve a solution treatment at 540°C for 6 hours, followed by quenching and artificial ageing at temperatures of 158°C, 200°C, and 230°C for 6 hours, followed by air cooling. The T6 heat treatment variations involve a solution treatment at 540°C for 6 hours, followed by quenching and artificial ageing at temperatures of 158°C, 200°C, and 230°C for 6 hours, followed by air. The weld joints were visually inspected and examined using radiography, then characterised by microstructure investigation and tensile and impact tests. Findings: The study's findings reveal that the T6 heat treatment significantly improves the mechanical properties of AA6063. However, the T6 heat treatment does not notably affect the mechanical properties of AA5083, the fusion line and the weld metal area. Among the artificial ageing temperature variations, the highest mechanical properties are achieved at 200°C, while the lowest mechanical properties are observed at 230°C. Research limitations/implications: Aluminium AA5083 is commonly utilised in constructing ship hull shells, which are welded with aluminium AA6063 to act as stiffeners. However, the joints often suffer structural damage, such as longitudinal and transverse cracks in the dissimilar weld area, particularly in the Heat-Affected Zone (HAZ) of AA6063, which includes frames, brackets, and collars. The paper focused on the influence of artificial ageing temperature in T6 heat treatment on the microstructure and mechanical properties of the dissimilar metals welding between AA5083 and AA6063. Originality/value: The optimum artificial ageing temperature in T6 heat treatment for the dissimilar metals welding between AA5083 and AA6063 was 200°C. The method can be applied in ship structures where AA5083 is typically utilised for constructing the hull shells, while AA6063 is employed as stiffeners.
EN
An experimental investigation was conducted to observe and analyze the microstructural evolution of phases present in the AK64 Al-Si-Cu alloy subjected to a modified T6 heat treatment (HT). The AK64 alloy1 is the Polish alternative of the A319.0 ASM standard aluminium alloy. The modified T6 HT schedule with a higher temperature and shorter duration was applied in the solutioning process and lower quenching and higher artificial ageing temperature than the prescribed by the ASM standard were used. The cooling curves registered during the liberating of overheating and solidifying processes give important information on nucleation temperatures for the Al dendrite network, Al-Si eutectic reaction and precipitation of Cu-rich phases. Comparison of the as-cast and heat treated microstructures revealed predicted microstructural changes and also partial fragmentation of the Fe-rich phases was observed after the application of the modified HT programme.
PL
Artykuł poświęcony jest obróbce cieplnej stopu AK64, który jest odpowiednikiem stopu ASM: A319.0. W badaniach zastosowano zmodyfikowaną obróbkę cieplną T6 o podwyższonej (w stosunku do procedury T6 HT – ASM) temperaturze wyżarzania i skróconym czasie starzenia naturalnego po przesyceniu w wodzie. Obserwacje struktury stopu po obróbce cieplnej wykazały dużą zgodność ze strukturami przewidzianymi na podstawie przeprowadzonych symulacji numerycznych. Dodatkowo określono wartości temperatury odpowiadającej początkowi zarodkowania fazy α(Al), reakcji eutektycznej Al-Si oraz wydzielania z roztworu fazy bogatej w Cu. Opisano również częściową fragmentację fazy zawierającej Fe, będącą następstwem zastosowanej zmodyfikowanej obróbki cieplnej.
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