Cyclic deformation response of ultra-fine grained titanium at elevated temperatures

Sajadifar, Seyed Vahid; Yapıcı, Güney Güven; Demler, Eugen; Krooß, P.; Wegener, Thomas; Maier, Hans Jürgen; Niendorf, Т.

doi:10.1016/j.ijfatigue.2019.01.021

Cited by 16 publications

(6 citation statements)

References 46 publications

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“…The area of a hysteresis loop is an indicator for the energy dissipation per cycle. Thus, this characteristic can be linked to the dislocation activity and cyclic plastic deformation [32,33]. By comparing stress amplitudes of both conditions based on the half-life hysteresis loops, it can be deduced that the cast-cast joints generally experienced slightly lower stress amplitudes than AM-cast specimens, which again is an indication of lower deformation resistance being rationalized by the inferior base material strength.…”

Section: Low-cycle Fatigue (Lcf) Behavior and Fracture Analysismentioning

confidence: 92%

Microstructural and mechanical properties of AlSi10Mg: Hybrid welding of additively manufactured and cast parts

Krochmal

Rajan²,

Moeini³

et al. 2022

Journal of Materials Research

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Welding and joining of hybrid components consisting of additively manufactured (AM) parts and conventionally processed parts offer new opportunities in structural design. In the present study, AlSi10Mg specimens were fabricated using two different manufacturing processes, i.e., laser-based powder-bed fusion of metals (PBF-LB/M) and casting, and welded by means of friction stir welding (FSW). Material strength of dissimilar welded joints was found to be governed by the as-cast material, which is characterized by a very coarse microstructure resulting in inferior hardness and tensile properties. During fatigue testing, cast-cast specimens performed slightly better than their hybrid AM-cast counterparts with respect to lifetime, being rationalized by most pronounced strain inhomogeneities in the AM-cast specimens. With the aim of cost reduction, FSW can be employed to fabricate graded large parts as long as the AM as-built material is placed in the region demanding superior cyclic load-bearing capacity. Graphical abstract

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Section: Low-cycle Fatigue (Lcf) Behavior and Fracture Analysismentioning

confidence: 92%

Microstructural and mechanical properties of AlSi10Mg: Hybrid welding of additively manufactured and cast parts

Krochmal

Rajan²,

Moeini³

et al. 2022

Journal of Materials Research

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“…Concomitantly, fatigue lives of both alloys reduced with the increase of the total strain amplitude. At higher total strain amplitudes, specimens suffer more rapid fatigue crack initiation and propagation [48][49]. It should also be noted that at higher Δε t /2, stress levels of AA7075 alloy are always higher than those of AA6082 alloy.…”

Section: Mechanical Properties Under Cyclic Loadingmentioning

confidence: 97%

“…As-received (T6) specimens also show a saturation stage similar to the conditions formed in the cold tool. A lack of softening/hardening is an indication of predominant elastic deformation (at the global scale) and/or simultaneous generation and cancellation of dislocations [48,55]. Furthermore it can be directly deduced that neither cutting of precipitates and strain localization nor evolution of dislocation cell structures take place [52,56].…”

Section: Mechanical Properties Under Cyclic Loadingmentioning

confidence: 99%

On the low-cycle fatigue behavior of thermo-mechanically processed high-strength aluminum alloys

Sajadifar

Scharifi

Wegener

et al. 2022

International Journal of Fatigue

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“…Due to an increasing total strain amplitude, fatigue crack nucleation and propagation can be promoted. [36,45,46] At total strain amplitudes of Δε t /2 = AE0.4% and Δε t /2 = AE0.6%, cyclic stability with no traces of cyclic hardening and softening is evident. However, an interesting cyclic hardening can be observed for the specimens being conventionally and stress-aged for a short time (2 h) during fatigue at a total strain amplitude of Δε t /2 = AE0.8%.…”

Section: Mechanical Properties Under Cyclic Loadingmentioning

confidence: 99%

Low‐Cycle‐Fatigue Performance of Stress‐Aged EN AW‐7075 Alloy

et al. 2023

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The effect of a novel heat treatment, that is, aging under superimposed external stress, on the fatigue performance and microstructural evolution of a high‐strength aluminum alloy (EN AW‐7075) is presented. Stress aging, a combination of heat treatment and superimposed external stress, can enhance the mechanical properties of EN AW‐7075 under monotonic loading due to the acceleration of precipitation kinetics. Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) reveal that a longer aging time and the presence of superimposed stress both promote the formation and growth of precipitates, that is, the precipitation of strengthening η´ precipitates. This is confirmed by differential scanning calorimetry (DSC) heating experiments of stressless and stress‐aged states. Furthermore, stress aging leads to a reduction of dimensions of precipitate‐free zones near grain boundaries. Cyclic deformation responses (CDRs) and half‐life hysteresis loops are evaluated focusing on the low‐cycle fatigue (LCF) performance of different conditions. A noticeable cyclic hardening seen in case of the specimens aged for a short time indicates the occurrence of dynamic strain aging (DSA). Eventually, stress aging allows for an enhancement of the monotonic mechanical properties of EN AW‐7075 without degrading the cyclic performance in the LCF regime.

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Cyclic deformation response of ultra-fine grained titanium at elevated temperatures

Cited by 16 publications

References 46 publications

Microstructural and mechanical properties of AlSi10Mg: Hybrid welding of additively manufactured and cast parts

Microstructural and mechanical properties of AlSi10Mg: Hybrid welding of additively manufactured and cast parts

On the low-cycle fatigue behavior of thermo-mechanically processed high-strength aluminum alloys

Low‐Cycle‐Fatigue Performance of Stress‐Aged EN AW‐7075 Alloy

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