Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Effect of artificial ageing temperature in T6-heat treatment on the mechanical properties of dissimilar metals weld between AA5083 and AA6063

Setyawan H., Muhayat N., Yuliadi M. Z., Manurung Y. H. P., Triyono T.

Archives of Materials Science and Engineering

2023

Vol. 123, nr 2

72--85

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.

Effect of Degassing Treatment on the Interfacial Reaction of Molten Aluminum and Solid Steel

Triyono T., Muhayat N., Supriyanto A., Lutiyatmi L.

Archives of Foundry Engineering

2017

Vol. 17, iss. 2

227--239

The gas porosity is one of the most serious problems in the casting of aluminum. There are several degassing methods that have been studied. During smelting of aluminum, the intermetallic compound (IMC) may be formed at the interface between molten aluminum and solid steel of crucible furnace lining. In this study, the effect of degassing treatment on the formations of IMC has been investigated. The rectangular substrate specimens were immersed in a molten aluminum bath. The holding times of the substrate immersions were in the range from 300 s to 1500 s. Two degassing treatments, argon degassing and hexachloroethane tablet degassing, were conducted to investigate their effect on the IMC formation. The IMC was examined under scanning electron microscope with EDX attachment. The thickness of the IMC layer increased with increasing immersion time for all treatments. Due to the high content of hydrogen, substrate specimens immersed in molten aluminum without degasser had IMC layer which was thicker than others. Argon degassing treatment was more effective than tablet degassing to reduce the IMC growth. Furthermore, the hard and brittle phase of IMC, FeAl3, was formed dominantly in specimens immersed for 900 s without degasser while in argon and tablet degasser specimens, it was formed partially.