A remarkable improvement of low-cycle fatigue resistance of high-Mn austenitic TWIP alloys with similar tensile properties: Importance of slip mode

Shao, Chenwei; Zhang, P.; Liu, R.; Zhang, Z.J.; Pang, J.C.; Duan, Qingling; Zhang, Z.F.

doi:10.1016/j.actamat.2016.07.034

Cited by 80 publications

(24 citation statements)

References 47 publications

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“…The TEM was employed to illustrate the dislocation morphologies of the two steels (shown in Figure ), the red arrows indicate the isolated dislocations. As shown in Figure a, there is almost no isolated dislocation (which indicates the planar slip), but dislocation tangle; however in Figure b, incomplete dislocation patterns around scattered isolated dislocations (which indicate the wavy slip) appear . For the SD320 fatigued specimen (Figure c), isolated dislocations form from the grain boundary triple junctions (shown by the yellow arrow) in the ferrite grain; and for the 550TG fatigued specimen (Figure d), lots of isolated dislocations in the grain have formed.…”

Section: Discussionmentioning

confidence: 92%

“…For HCF loading, the Mn can transfer the slip behavior from planar to wavy in some extent. For SD320, the Mn content is a little higher, and the wavy slip is absolute predominance; for 550TG, the wavy slip is still the leading role, but the ability of planar slip increases …”

Section: Discussionmentioning

confidence: 98%

“…In some extent, the influence of chemical composition should not be ignored. The Mn content of SD320 is much more than that of 550TG, increasing the Mn content can also improve the fatigue property, which may originate from the relatively low damage accumulation rate of planar slip . Meanwhile, Mn plays an important role for grain refinement.…”

Section: Discussionmentioning

confidence: 99%

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Tensile and High‐Cycle Fatigue Properties of Steel Sheet with Trace Silicon

et al. 2017

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The tensile properties, high-cycle fatigue properties, fracture surface morphologies, corresponding damage mechanisms, and dislocation patterns of two steels with trace silicon, 550TG and SD320, are investigated. It is found that the SD320 has a higher tensile strength than 550TG, but lower plasticity. In general, some deep cracks appear along the direction of rolling in all the tensile specimens and the fatigue limit of SD320 is higher. In particular, the 550TG shows a continuously decreasing S-N characteristic without fatigue limit at the higher cycle region, which can be explained by their differences of dislocation morphologies. Furthermore, the tensile and fatigue damage mechanisms are deeply analyzed and discussed.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

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Tensile and High‐Cycle Fatigue Properties of Steel Sheet with Trace Silicon

et al. 2017

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“…1) The high dislocation density is coincident with significant monotonic tensile elongation in austenitic SS. The low-cycle fatigue (LCF) life is considered to be related to the tensile elongation; [2][3][4] however, studies have shown that the relationship between the LCF life and the tensile elongation is not necessarily strong. 5,6) Additionally, with the increase in the dislocation density and elongation, the maximum tensile work hardening of austenitic SS increases.…”

Section: Introductionmentioning

confidence: 99%

“…..................... (4). where ρ and b are the density and Burgers vector of the dislocations, respectively, and C is the average contrast…”

mentioning

confidence: 99%

Characterization of Dislocation Evolution in Cyclically Loaded Austenitic and Ferritic Stainless Steels via XRD Line-profile Analysis

Moshtaghi

Sato

2019

ISIJ Int.

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Dislocations in austenitic and ferritic stainless steels (SSs) under cyclic loading were quantitatively evaluated via X-ray diffraction line-profile analysis to determine the relationship between the dislocation density and low-cycle fatigue (LCF) life in both SSs. The dislocation density of the austenitic and ferritic SSs varied linearly with respect to the LCF life in a double-logarithmic graph, with different slopes of the line. The dislocation density normalized by the maximum work hardening for both SSs exhibited a log-log linear relationship with the LCF life. The fraction of screw dislocations in the ferritic SS decreased with decreasing LCF life owing to the easy cross-slip of dislocations. Because of the difficulty of the cross-slip of dislocations in the austenitic SS, the fraction of screw dislocations remained almost constant throughout the LCF life. Analysis of the crystallite size and the dislocation arrangement with respect to the dislocation density under tensile and cyclic loading revealed that the dislocation arrangement for cyclic loading was smaller than that for tensile loading. Thus, the dislocation arrangement was related to the cyclic loading. In the plot of the dislocation evolution versus the number of cycles, two stages were observed in the variation of the dislocation characteristics for both SSs. In the first stage, the dislocation density increased, and the crystallite size decreased. The dislocation arrangement parameter of the ferritic and austenitic SS decreased and remained the same, respectively, in the first stage. In the second stage, the dislocation density, dislocation arrangement parameter, and crystallite size remained constant.

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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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A remarkable improvement of low-cycle fatigue resistance of high-Mn austenitic TWIP alloys with similar tensile properties: Importance of slip mode

Cited by 80 publications

References 47 publications

Tensile and High‐Cycle Fatigue Properties of Steel Sheet with Trace Silicon

Tensile and High‐Cycle Fatigue Properties of Steel Sheet with Trace Silicon

Characterization of Dislocation Evolution in Cyclically Loaded Austenitic and Ferritic Stainless Steels via XRD Line-profile Analysis

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

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