## 1 Introduction  
Laser powder bed fusion (LPBF) is one of the additive manufacturing (AM) technologies that uses laser heat to consolidate materials in atomised powder form, in a layer-by-layer process, to form a three-dimensional component [1]. Like other AM technologies, such as electron beam powder bed fusion (EBPBF), directed energy deposition (DED) and wire arc additive manufacturing (WAAM), the thermal history associated with the process produces parts with multiscale architectures that differ from their wrought and cast counter parts [2]. Elongated grains, metastable phases and macro-scale residual stresses are among the features that characterise parts produced by AM [3]. The heat treatment of AM parts produced by different technologies for alleviation of macro-scale residual stress and decomposition of the metastable phase formed during the process to an equilibrium microstructure has been studied extensively [3, 4]. The Ti6 Al4V(ELI--extra-low interstitial) alloy parts produced via LPBF have particularly lured interest in the aerospace industry. This is mainly because the technology greatly reduces the buy-to-fly ratio, offers design flexibility, reduces the lead time for production and does not require the making of special tooling [5]. The freeform nature of the technology has also been beneficial for production of medical implants with convoluted shapes, particularly from the Ti6 Al4V alloy. Extensive research has been carried out and is still ongoing to assess the quality of the LPBF Ti6 Al4V parts for use in the biomedical and aerospace industries, with the prospect of application in the marine and military sectors [5; 6; 7]. The foremost demand for these additively manufactured parts in these industries are their load-bearing capacity, with their quasi-static, dynamic and fatigue performances being the key mechanical properties under consideration [8; 9]. The mechanical properties of materials are fundamentally different at quasi-static strain rates (\(<\)10\({}^{2}\) s\({}^{-1}\)) compared with those under dynamic conditions (\(>\)10\({}^{2}\) s\({}^{-1}\)). During quasi-static loading, a state of quasi-static equilibrium is usually maintained as the load is applied very slowly, thus the stiffness of structures loaded this way is not governed by inertia. Furthermore, any element within such a structure has the sum of forces acting on it, approaching zero (\(\approx\)0 acceleration effect). At dynamic conditions, on the other hand, deformation stresses travel through materials, resulting in different loading states for different regions at any given time and, therefore, large, induced inertia forces that cannot be ignored [10]. It has been shown that materials possess satisfactory ductility under quasi-static loads but may fail at small strains under dynamic loads [11]. However, the strength of materials has been shown to increase under dynamic loads due to the instantaneous pile up of dislocations at yielding [12]. Fatigue analysis is usually performed to discern the satisfactory performance level of structural parts under cyclic loading. Additively manufactured Ti6 Al4V for use in aircraft, military and automobile fields is predominately for quasi-static to high strain rate applications, whilst its use in the medical sector is largely at quasi-static conditions. In this study, the quasi-static mechanical performance of LPBF Ti6 Al4V(ELI) was investigated from the aircraft, medical, military and automobile application points of view. The tensile static properties of AM Ti6 Al4V have been investigate widely by various researchers [13; 14; 15; 16]. [PERSON] et al. [13] investigated the ambient temperature tensile and fatigue properties of Laser Engineered Net Shaping (LENS)-produced Ti6 Al4V, manufactured with different orientations. The mechanical response of as-built LPBF Ti6 Al4V parts were characterised by tensile testing at quasi-static strain rate and ambient temperature by [PERSON] et al. [14]. [PERSON] et al.