Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Influence of post weld heat treatment on the microstructure of friction stir welded 7xxx aluminum alloys

nr katalogowy: 79714

Friction stir welding (FSW) is a solid state joining method successfully applied to metallic alloys. The technology has gained an expanding popularity in the manufacture of ships, airplanes, cars and railway carriages. The technique provides numerous advantages over conventional welding methods, e.g. environmental and cost-reducing benefits. Nevertheless, the most important advantage of FSW is the possibility of joining metallic materials, which are difficult to weld by traditional fusion welding [1, 2]. It has been found that high-quality, sound welds with good mechanical properties may be produced between non-weldable aluminum alloys of the 7xxx series [3, 4]. However, the FSW welds show lower mechanical properties in comparison to the base materials. Coarsening and dissolution of the strengthening phases is the reason for this fact due to the temperature increase during the FSW process [4]. In order to improve the weld properties, post welding heat treatment (PWHT) is often applied. Only recently some studies have focused on post weld heat treatment of friction stir welded 7xxx aluminum alloys [5÷10]. Sharma et al. [5] examined the influence of five different post weld heat treatments (natural aging, artificial aging, two-step aging, solution treatment, solution treatment followed by artificial aging) on friction stir welded 7039 aluminum alloy. All forms of aging resulted in grain coarsening in all FSW zones, whereas solution treatment without and with artificial aging induced abnormal grain growth across the whole area modified by FSW. The most beneficial post weld heat treatment is natural aging. Room temperature ageing increases hardness and strength, however, it is efficient in 7xxx alloys which do not contain copper. If copper is present, like in 7050 or 7075 alloys, the natural aging should be extended to over 50 000 hours to give a significant increase in hardness [6]. On the other hand, short-term artificial aging[...]

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