A5010059354- Additive Manufacturing Materials and Processes
- High Entropy Alloys Studies
- Welding Techniques and Residual Stresses
- Metallurgy and Material Science
- Aluminum Alloy Microstructure Properties
- Microstructure and mechanical properties
- Aluminum Alloys Composites Properties
- Adhesion, Friction, and Surface Interactions
- Surface Roughness and Optical Measurements
- Nanoporous metals and alloys
- Nuclear Materials and Properties
- Materials Engineering and Processing
- Titanium Alloys Microstructure and Properties
- Tribology and Wear Analysis
- Metal and Thin Film Mechanics
- Metal Alloys Wear and Properties
- Laser-induced spectroscopy and plasma
- Additive Manufacturing and 3D Printing Technologies
Defence Materials Technology Centre (Australia)
2015-2024
RMIT University
2016-2023
Swinburne University of Technology
2023
The University of Melbourne
2013-2021
High strength steels are a vital material for aerospace applications but also prone to damage from fatigue, corrosion, and wear. Additive manufacturing (AM) processes such as laser directed energy deposition (L-DED) offer means repairing both the geometry structure of damaged steels; however, significant variation in tensile properties have been reported following repair. While previous studies tried improve performance through postdeposition heat treatment, practices may not be possible...
The aim of this paper was to investigate the effect delay time between clad tracks on microstructure hardness evolution. AISI 420 stainless steel deposited onto 300M substrate using a fiber delivered disk laser and powder blown coaxial nozzle. aimed at controlling in situ quench tempering sequence during cladding process. Four different times were investigated (continuous build, t = 2 s, 5 60 s). No micro-cracking very little porosity observed for all variables. changed from untempered...
Laser metal deposition (LMD) presents a novel method for the repair of high value aerospace components as cracked or wear damaged areas may be locally removed and replaced with fresh materials. To better understand influence extent on mechanical performance, tensile specimens 300M strength steel were repaired using LMD to account 10%, 20%, 40% total cross section depth, 420SS used feed material. provided significant improvements compared grind-out condition, greater benefit larger fill...
Nickel aluminium bronze (NAB) was subjected to equal channel angular pressing (ECAP) using routes BA and C at 400°C investigate the effect of precipitate size morphology on grain refinement in low stacking fault energy alloys. Both produced dynamically recrystallised grains ∼550 nm although only route able create a uniform distribution refined grains. The large unrefined regions NAB processed via thought arise from its inability redistribute various phases, as recrystallisation enhanced...
Abstract Laser-directed energy deposition (L-DED) is a key enabling technology for the repair of high-value aerospace components, as damaged regions can be removed and replaced with additively deposited material. While L-DED improves strength fatigue performance compared to conventional subtractive techniques, mechanical limited by process-related defects. To assess role oxygen on defect formation, local chamber-based shielding methods were applied in 300M high steel. Oxidation between...
Laser cladding is an emerging tool for the repair of critical aerospace components, with damaged areas ground away and replaced fresh material. Previous investigations high strength steels have shown single layer repairs to produce overly hard clads comprised untempered martensite, further heat treatments required acceptable mechanical properties. In this investigation, microstructure hardness a multi-layer clad 300M steel on substrates were analysed determine viability in-situ treatment via...
Inert gas shielding is a vital component of laser deposition as this prevents adverse interactions between the deposit and atmospheric gasses. Nozzle chamber based are most common forms protection. While easier to implement, nozzle provides protection at local level only, leaving surfaces more prone oxidation compared shielding. In study, role on large solidification cracks in Aermet100 deposited onto 300M was investigated. Large present shielded samples were eliminated when implemented,...