Effect of rolling process on fatigue performance of stir zone of AA6061‐T6 doube‐side friction stir welding joint

Abstract

Stir zone (SZ) of AA6061‐T6 double‐side friction stir welding (DS‐FSW) joint with a thickness of 6 mm had a poor fatigue performance compared with that of base metal (BM). The rolling process was employed to improve the fatigue performance of SZ. The results showed that rolling process increased the dislocation density in SZ and remarkably enhanced its fatigue performance. The crack initiation played a key role in the fatigue performance of SZ. It relied on the debonding of lamellar structure in SZ. The debonding of lamellar structure depended on the cracking of fine grain layer in lamellar structure.

Quasi-In Situ Observation of the Microstructural Response during Fatigue Crack Growth of Friction Stir Welded AA2024-T4 Joint

“…Subsequent studies delved into fatigue performance [14][15][16], with Takao et al [14] analyzing the fatigue life of non-through cracks in friction stir welded AA2024-T3 joints, noting the influence of welding conditions on fracture locations. As research progressed, fatigue crack growth (FCG) behavior became a prominent topic [17][18][19][20].…”

Stress partitioning and effective behavior of N-phase laminates in anisotropic elasticity from a fast explicit method

“…Hence, it can be very useful to test, on a huge number of configurations, the influence of different parameters like material single crystal elastic constants, crystallographic misorientation, crystal volume fraction, interface inclination, amount of plastic deformation or loading type (Gemperlová et al 1989;Richeton and Berbenni 2013;Richeton et al 2015). In the same way, explicit analytical models for N-phase laminates are very useful to investigate the influence of the previously mentioned parameters in problems involving several parallel interfaces, like in thin films (e.g., Welzel et al 2003;Abadias et al 2018), in electronics packaging (e.g., Wong and Lim 2008), in nanolaminated materials (e.g., Mukhopadhyay et al 2017;Wang et al 2017) or in materials with welding joints which are classically modelled as a base metal, a heat affected zone and a weld metal (e.g., Du et al 2020). Actually, laminated materials are widely used in the industry because of the relative ease to control their properties from the choice of the materials combination,…”