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Summarize the abstract and introduction in simple language please… Summarize the abstract and introduction in simple language please ABSTRACT The fatigue resistance of AM-SLM AlSi10Mg samples built in the Z direction after various heat treatments was investigated. Specimens were tested in the as-built (AB) condition, after stress relief (SR) treatment and after SR and hot isostatic pressing (HIP) at either 250 ? or 500 ?. The AB machined and polished specimens displayed the highest fatigue limit (Sf = 125 MPa, Nf = 107 cycles). SR and HIP cycles decrease the yield strength, hardness and fatigue limit. The SR and HIP treatment at 500 ? resulted in the lowest fatigue resistance due to significant microstructural changes. A relation between the yield stress and fatigue resistance was established. Linear elastic fracture mechanics were employed for evaluating fracture surface morphology. Based on the results of fracture surface characterization, values of the critical stress intensity factor (Kcr) for AM-SLM AlSi10Mg specimens after various heat treatments were estimated.Introduction Given the progress made in SLM-AM technology over the last decade, there is a need for in-depth investigation of a wide range of mechanical properties of printed parts, including fatigue resistance. It was estimated about 90% of engineering failures are related to fatigue [1,2]. The presence of defects, such as porous, un-melted regions and surface roughness, can significantly affect fatigue resistance due to stress concentration, leading to crack formation and ultimately, failure [3,4]. The effect of fatigue resistance of SLM-AM aluminum alloys has been investigated [4-7]. Aboulkhair et al. [4] considered the effect of surface roughness and thermal treatment on the fatigue life of AlSi10Mg alloy. They reported that the effect of T6 heat treatment was more significant than surface machining. Brandl et al. [5] also concluded that the fatigue resistance of SLM AlSi10Mg specimens was mostly affected by T6 heat treatment, while the effects of the build plate temperature and building direction were significantly lower. Suryawanshi et al. [6] reported that the formation of fatigue cracks at the surface of printed specimens took place at lower stresses than with casting samples. Mower et al. noted lower fatigue resistance of printed AlSi10Mg parts than those prepared from conventional Al6061 alloy [7]. The effect of hot isostatic pressing (HIP) treatment on fatigue resistance was only investigated with cast aluminum alloys. It was established that HIP treatment at 520 ? and 100 MPa for 2 h led to a decrease in the volume fraction of pores and significantly increased fatigue resistance [8]. In addition, fatigue cracks in the HIP-treated specimens initiated mostly at the Si/Al interface. It should be noted that relatively high temperature HIP treatment of cast alloys strongly affects porosity, with only minor changes of other microstructural features being observed [9-12]. In the case of AM SLM parts with extremely fine microstructure, high temperature HIP treatment may lead to microstructure coarsening and significantly decreased mechanical properties. In the present study, the effect of post building treatments, such as stress relief, surface polishing and HIP treatment on the fatigue resistance of AlSi10Mg parts fabricated by AM SLM technique was investigated and discussed.Engineering & TechnologyMechanical EngineeringRESEARCH 102

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