Microstructure and Fatigue

Christ, Hans‐Jürgen; Mughrabi, H.

doi:10.1007/978-94-011-2860-5_10

Cited by 15 publications

(4 citation statements)

References 14 publications

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“…Fine and dispersed precipitates lead to a short interparticle spacing signifying dislocation–precipitate interactions. [ 29,31,32 ] By taking changes in the mechanical properties and microstructural evolution into account, it is worth noting that with a decrease in the transfer time, the hardness and UTS values are close to the T6 condition (Figure 10b). Higher hardness, yield strength, and UTS of the sample with a transfer time of 10 s compared to that with a transfer time of 25 s can be ascribed to the higher volume fraction of fine and dispersed second‐phase particles formed.…”

Section: Resultsmentioning

confidence: 96%

Functionally Graded AA7075 Components Produced via Hot Stamping: A Novel Process Design Inspired from Analysis of Microstructure and Mechanical Properties

et al. 2023

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Herein, functionally graded AA7075 components manufactured via hot stamping are investigated by focusing on the effect of different process variables on localized microstructure evolution. To realize gradation through stamping, an active tool is designed and applied. The design of experiments allows to assess the impact of transfer time from the furnace to the tool, quenching time in the tool, and final quenching media. Related characteristics of mechanical properties throughout the hat‐shaped profile are assessed via hardness and tensile tests. As expected, the sections of the samples formed in the cooled part of the tool are characterized by higher mechanical strength following subsequent aging, while sections formed in the heated part exhibit higher ductility. Moreover, the microstructural analysis reveals that fine precipitates with minimum interparticle distances only form in the cooled section of the samples. Increasing the tool temperature at the heated side to 350 °C results in the formation of coarse precipitates in the grain interior and along the grain boundaries. A sharp gradient in terms of microstructural and mechanical properties is found between these conditions. After reducing the transfer time, an increased volume fraction of fine precipitates leads to further improvements in hardness and mechanical strengths.

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Section: Resultsmentioning

confidence: 96%

Functionally Graded AA7075 Components Produced via Hot Stamping: A Novel Process Design Inspired from Analysis of Microstructure and Mechanical Properties

et al. 2023

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“…This new generation of TiAl alloys is now under testing. Studies of the low cycle fatigue properties of the high Nb TiAl alloys are rare [2,3]. Christ et al [3] observed stable cyclic behavior, satisfactory strength and lifetime at high temperatures and environmental surface embritlerment which increases with temperature.…”

Section: Introductionmentioning

confidence: 99%

Low Cycle Fatigue of Cast γ-TiAl Based Alloys at High Temperature

Petrenec

Šmíd

Kruml

et al. 2010

KEM

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The low-cycle fatigue properties of cast nearly lamellar TiAl alloys with diverse Nb content at room temperature and 750°C were compared. Monotonic tensile curves, cyclic stress-strain curves (CSSC) and combined fatigue life curves were obtained at both temperatures. After cyclic straining the surface relief and the fracture surfaces were observed using scanning electron microscopy. The increase in Nb content significantly improves tensile properties and CSSCs at both temperatures. The combined fatigue life curves especially at 750 °C are shifted to higher fatigue lives. The effect o Nb content on the tensile and cyclic strength is discussed in relation to the thickness of the lamellae. Persistent slip markings formed along interlamellar interfaces were predominant locations for fatigue cracks. At both temperatures and materials showed similar crack initiation and propagation behavior. The cracks initiated at surface or in sub-surface region creating smooth flat areas corresponding to the persistent slip bands.

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“…In this paper, some results of more recent studies of the author and his research group on the fatigue of different engineering materials will be presented, cf. [1,2 . This work addresses low-and high-temperature push-pull fatigue including thermomechanica 1 fatigue.…”

Section: Introdu(jti0nmentioning

confidence: 99%

“…This work addresses low-and high-temperature push-pull fatigue including thermomechanica 1 fatigue. Among the materials investigated are the age-hardenable aluminium alloy AlZnMgCu 0.5 which is similar to the alloy 7022 [1,3], martensitic and bainitic variants of the roller bearing steel SAE 52100, German designation 100Cr6 1 4 5 , the metastable austenitic steels of the AISI 304 L-series, German designations X 3 Cr k-d i 18 [1,2,6,7,8] and X 2 CrNi 19 11 [9,10,11], the normalized plain carbon steel SAE 1045, German desi nat~on Ck 45 [2,12], and the monocrystalline -(-hardened nickel-bare superalloy CMSX-6 RI~].…”

Section: Introdu(jti0nmentioning

confidence: 99%

Cyclic plasticity and fatigue of metals

Mughrabi

1993

J. Phys. IV France

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This report*) is a survey of the cyclic deformation and fatigue behaviour of selected engineering steels and alloys. Emphasis is placed on the important roles of the cyclic slip mode and the stability of the microstructure during cyclic stressing and on the conditions of fatigue testing with res FFt tO the failure mechanisms and fatigue life. The examples presented include low-temperature atigue high-temperature fatigue in the presence of dynamic strain ageing and thermomechanical fatigue.

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Microstructure and Fatigue

Cited by 15 publications

References 14 publications

Functionally Graded AA7075 Components Produced via Hot Stamping: A Novel Process Design Inspired from Analysis of Microstructure and Mechanical Properties

Functionally Graded AA7075 Components Produced via Hot Stamping: A Novel Process Design Inspired from Analysis of Microstructure and Mechanical Properties

Low Cycle Fatigue of Cast γ-TiAl Based Alloys at High Temperature

Cyclic plasticity and fatigue of metals

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