Low-cycle and extremely-low-cycle fatigue behaviors of high-Mn austenitic TRIP/TWIP alloys: Property evaluation, damage mechanisms and life prediction

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

doi:10.1016/j.actamat.2015.11.015

Cited by 167 publications

(74 citation statements)

References 47 publications

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“…Note, that the described phenomena occurred significantly below the yield strength Rp0.2 which clearly differed from the results shown by the literature for high manganese austenites, and even for austenitic stainless steels [6,7]. (Fig.…”

Section: Strain Increase Tests (Sit)contrasting

confidence: 76%

“…Hamada et al [5] showed that a short period of cyclic hardening is followed by cyclic softening and a saturation state until fracture. In addition Shao et al [6] made similar observations and reported further that in the LCF regime the amount of the initial cyclic hardening increases with increasing total strain amplitude. At low and moderate total strain amplitudes (εa,t < 1.0 %) the degree of cyclic softening is enhanced.…”

Section: Introductionsupporting

confidence: 64%

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Influence of the surface morphology on the cyclic deformation behavior of HSD® 600 steel

Klein¹,

Smaga²,

Beck³

2018

MATEC Web Conf.

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Abstract. The presented research work investigates the fatigue properties in the low cycle fatigue (LCF) regime of the high manganese metastable austenitic High Strength and Ductility (HSD ® ) 600 TWIP steel dependent on its surface morphology. The steel features, according to its chemical composition following the alloying concept Mn-Al-Si-C and heat treatment, a fully austenitic microstructure that shows deformation induced twinning at ambient temperature. Due to this microstructural deformation mechanism, HSD ® 600 steel has an outstanding combination of strength and formability. Besides monotonic deformation behavior, characterized by tensile tests, cyclic deformation behavior was investigated with varying the surface morphology of fatigue specimens. In order to create different surface morphologies, flat fatigue specimens were excised from larger sheets by waterjet-cutting. Depending on the surface morphology, further climb milling or up-climb milling in the gauge length was performed. The three investigated morphologies (asreceived with rolling skin, climb milled and up-climb milled) differed in roughness, initial residual stresses and initial phase compositions. For all variants, total strain controlled fatigue tests with stepwise increasing load amplitudes as well as total strain controlled single step tests were performed in the low cycle fatigue regime with a load ratio of Rε = -1 and a frequency of f = 0.2 Hz. Beside stress-strain hystereses, the changes in temperature ΔT and the magnetic properties ξ were measured. The magnetic properties directly correlate with the transformation from paramagnetic γ-austenite to ferromagnetic α'-martensite. The cyclic deformation behavior of the HSD ® 600 steel in the LCF regime was characterized by cyclic softening until fracture at low total strain amplitudes but changed with increasing total strain amplitudes into initial cyclic hardening followed by cyclic softening. This initial cyclic hardening became more pronounced when the total strain amplitude increased. Furthermore, single step tests at lower total strain amplitudes showed a saturation state before fracture. A comparison between the monotonic and cyclic deformation behavior showed a significant difference of the stress levels at the same amounts of plastic deformation respectively. Nevertheless, the different surface morphologies led to different lifetimes at high total strain amplitudes but to similar lifetimes at lower total strain amplitudes.

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Section: Strain Increase Tests (Sit)contrasting

confidence: 76%

Section: Introductionsupporting

confidence: 64%

Influence of the surface morphology on the cyclic deformation behavior of HSD® 600 steel

Klein¹,

Smaga²,

Beck³

2018

MATEC Web Conf.

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“…But on the basis of macroscopic parameters such capability can be described by Manson-Coffin-as well as Ramberg-Osgood-evaluations of experimental data. For example a decreasing cyclic strain hardening exponent would be a suitable parameter to describe the "robustness" or "damage defusing ability" of such materials under fatigue [39]. Following this, one can derive that at carbon + nitrogen % 0.9 cyclic strain hardening exponent n' reaches its minimum value for the steels investigated and, therefore, the maximum robustness would be achieved, Figure 6.…”

Section: Discussionmentioning

confidence: 99%

“…Still carbon + nitrogen should not exceed 0.9 wt.%. Strain-wise we could state the same, if we follow the approach of [39] who proposed a criterion for the capacity to dissipate cyclic plastic work. According to this work based on high-manganese transformation induced plasticity/twinning induced plasticity steels with and without 0.9 % carbon the optimal "robust" material is characterized by a maximum "deformation capacity and reversibility" as well as "defect accommodation ability".…”

Section: Discussionmentioning

confidence: 99%

“…-For the investigated steels the total strain amplitude-values at the intersection of the monotonic and cyclic stress strain curves depends mainly on the nitrogen/nickel-ratio. -Following the approach of [39] it can be shown that this mixed behavior has no detrimental influence on the cyclic "robustness" of these alloys. -All twinning induced plasticity-steels are represented by a stacking fault energy between 20 mJ/m 2 and Figure 8.…”

Section: Discussionmentioning

confidence: 99%

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The influence of the nitrogen/nickel‐ratio on the cyclic behavior of austenitic high strength steels with twinning‐induced plasticity and transformation‐induced plasticity effects

Güler

Schymura

Fischer

et al. 2018

Materialwissenschaft Werkst

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Austenitic high nitrogen (AHNS) and austenitic high interstitial steels (AHIS) are of interest for mechanical engineering applications because of their unique combination of mechanical (strength, ductility), chemical (corrosion resistance) and physical (non-ferromagnetic) properties. But despite their high strength values e. g. after cold deformation up to 2 GPa in combination with an elongation to fracture of 30 %, which is based on twinning-induced plasticity (TWIP) mechanisms and transformation-induced plasticity (TRIP) mechanisms, the fatigue limit remains relatively small. While for chromium-nickel steels the fatigue limit rises with about 0.5-times the elastic limit it does not at all for austenitic high-nitrogen steels or only to a much smaller extent for nickel-free austenitic high-interstitial steels. The reasons are still not fully understood but this behavior can roughly be related to the tendency for planar or wavy slip. Now the latter is hindered by nitrogen and promoted by nickel. This contribution shows the fatigue behavior of chromium-manganese-carbon-nitrogen (CrMnCn) steels with carbon + nitrogen-contents up to 1.07 wt.%. Beside the governing influence of these interstitials on fatigue this study displays, how the nitrogen/nickel-ratio might be another important parameter for the fatigue behavior of such steels.Keywords: Austenitic high strength steels / Ramberg-Osgood / twinning-induced plasticity (TWIP) / transformation-induced plasticity (TRIP) / nitrogen-nickel ratio / cyclic behavior Schlü sselwö rter: Austenitische hochfeste Stä hle / Ramberg-Osgood / durch Zwillingsbildung induzierte Plastizitä t (TWIP) / umwandlungsbewirkte Plastizitä t (TRIP) / Stickstoff-Nickel Verhä ltnis / zyklische Belastung Corresponding author: S. Gü ler, Institut fü r die Technologien der Metalle, Lehrstuhl Werkstofftechnik, Universitä t Duisburg-Essen,

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Low‐Cycle Fatigue Properties and Life Prediction of the Steels with Trace Silicon

et al. 2016

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For the steels with trace silicon, the tensile properties, low-cycle fatigue properties, fatigue fracture morphologies, dislocation evolutions, and life predictions of 550TG and SD320, are investigated. It is found that cyclic hardening appears in 550TG and opposite tendency in SD320, respectively; the dislocation density decreases after fatigue experiment for the two materials. The sub-grain boundaries in 550TG and dynamic recovery in SD320 has been discussed. The dislocation planar and wavy slip in 550TG and only planar slip in SD320 can be found. For life prediction, Basquin & Manson-Coffin and hysteretic energy relationships are more appropriate. This study will be useful for the improvement of fatigue property.

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Low-cycle and extremely-low-cycle fatigue behaviors of high-Mn austenitic TRIP/TWIP alloys: Property evaluation, damage mechanisms and life prediction

Cited by 167 publications

References 47 publications

Influence of the surface morphology on the cyclic deformation behavior of HSD® 600 steel

Influence of the surface morphology on the cyclic deformation behavior of HSD® 600 steel

The influence of the nitrogen/nickel‐ratio on the cyclic behavior of austenitic high strength steels with twinning‐induced plasticity and transformation‐induced plasticity effects

Low‐Cycle Fatigue Properties and Life Prediction of the Steels with Trace Silicon

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