Peihao Geng

A three-dimensional coupled thermo-mechanical model was developed to simulate the linear friction welding (LFW) of same or dissimilar Ni-based superalloys. Full friction contact-interaction for two deformable workpieces rubbing against each other was considered using plastic/plastic friction pair model. Numerical simulated results have been well validated by experimental measured data. Owing to the inherent motion mechanism of LFW, interfacial heat flow varied with time periodically, resulting i

A three-dimensional finite element thermal-mechanical coupling model was developed to simulate the friction spot joining with a flat shoulder tool for AA6061-T6 Al alloy and carbon fiber reinforced polymer (CFRP) at different welding conditions. When joining at 1500 rpm rotation speed and 0.1 mm/s plunge speed, the peak temperature at the Al alloy-CFRP interface reached up to 575 °C as the plunge depth was increased to 0.6 mm. The interfacial temperature was reduced as rotation speed or plunge d

Through precise control and manipulation of welding parameters for inertia friction-welded Al alloy/steel joints, the transformation of nanoscale interfacial layer from the amorphous to the mixed phase (co-existence of amorphous and crystallised phases) and then to a fully crystallised Fe2Al5 intermetallic compound (IMC) was observed. The temperature and velocity range for the formation of different phases, including amorphous phase, mixed phase and IMC was exploited. A high level of plastic def

Linear friction welding (LFW) technology, as an advanced manufacturing approach to fabricate the bimetallic turbine blisks, is receiving increasing attention from aerospace industries. Current work experimentally investigated the microstructural evolution and microhardness in LFW of FGH4096 and GH4169 superalloys. A complete dynamic recrystallization (DRX) was obtained in friction interface zone (FIZ) with no obvious secondary phases including δ and carbide phases on GH4169 side, and primary and