Effect of Work‐Hardening Mechanisms in Asymmetrically Cyclic‐Loaded Austenitic Stainless Steels on Low‐Cycle and High‐Cycle Fatigue Behavior

Moshtaghi, Masoud; Safyari, Mahdieh

doi:10.1002/srin.202000242

Cited by 21 publications

(13 citation statements)

References 56 publications

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“…Compared to samples 1 and 2, sample 3 exhibited a superior maximum tensile work hardening, which is in agreement with the result that the deformation-induced martensite transformation remarkably increased work hardening. This characteristic has been frequently reported in the relative literature on work-hardening behavior [ 38 , 39 ].…”

Section: Resultssupporting

confidence: 62%

Advantageous Implications of Reversed Austenite for the Tensile Properties of Super 13Cr Martensitic Stainless Steel

Wang

Zheng

et al. 2022

Materials

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The advantageous implications of the microstructure and volume fraction of reversed austenite for the tensile properties of super 13Cr martensitic stainless steel (13Cr SMSS) in an experiment with quenching and double-step tempering treatment in the temperature range of 550–750 °C were investigated. The results show that, with increases in one-step tempering temperature, the content of reversed austenite was enhanced considerably from 0.9% to 13.3%. The reversed austenite distributed in the martensitic lath boundary conformed to the (1\({\overset{-}1}\)1)γ//(011)α’ and [011]γ//[\({\overset{-}1}\)\({\overset{-}1}\)1]α’ Kurdjumov–Sachs orientation relationship with the matrix. When tempered at 675 °C for 3 h for the first stage and 600 °C for 2 h for the second stage, the maximum volume fraction of reversed austenite was approximately 13.3%, achieving uniform elongation of 10.4% and total elongation of 27.2%. Moreover, the product of strength and elongation (PSE) was 23.5 GPa·% higher than other samples. The outstanding combination of high strength and commendable plasticity was due to the phase transformation of the reversed austenite into secondary martensite during tensile straining. The reversed austenite consumed the plastic energy at the tip of the microcrack and made the crack tip blunt, which hindered the further propagation of the crack, consequently increasing the total elongation and improving toughness.

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Section: Resultssupporting

confidence: 62%

Advantageous Implications of Reversed Austenite for the Tensile Properties of Super 13Cr Martensitic Stainless Steel

Wang

Zheng

et al. 2022

Materials

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“…This conclusion was confirmed in the present paper. The properties of the Ti20Nb5Zr foam (approximately 60% porosity) were as follows: compression strength 15.5 ± 0.9 MPa, elastic moduli 0.71 ± 0.1 GPa, 98 ± 5 GPa measured by compression tests and using a nanoindentation tester, respectively, HV hardness 276 ± 20, calculated yield strength 92 MPa (σ = HV/3) [ 43 , 44 ]. Figure 5 shows the stress-strain curve recorded for the Ti20Nb5Zr foam.…”

Section: Resultsmentioning

confidence: 99%

Biomedical Ti-Nb-Zr Foams Prepared by Means of Thermal Dealloying Process and Electrochemical Modification

et al. 2022

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The paper presents results of preparation and modification of Ti20Nb5Zr foams by a thermal dealloying method followed by electrochemical modification. The first step of this study was the preparation of Ti20Nb5Zr30Mg nanopowder using mechanical alloying (MA). The second was forming green compacts by cold pressing and then sintering with magnesium dealloyed from the structure, which resulted in pores formation. The next step was surface modification by electrochemical etching and silver nanoparticle deposition. Porosity, morphology, mechanical properties as well as biocompatibility and antibacterial behavior were investigated. Titanium foam porosity up to approximately 60% and wide pore size distribution were successfully prepared. The new materials have shown positive behavior in the MTT assay as well as antibacterial properties. These results confirmed great potential for thermal dealloying in preparation of porous structures.

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“…The SFE of austenite matrix is the decisive factor, and a high SFE is not conducive to the occurrence of mechanical twins. Equation (1) is used to calculate the SFE of austenitic stainless steels [22]; however, the SFE of high Mn austenitic steels is usually calculated based on thermodynamic theory, and there is no similar general calculation formula for high Mn austenitic steels at present. SFE(mJm −2 ) = −7.1 + 2.8(%Ni) + 0.49(%Cr) + 2.0(%Mo) − 2.0(%Si) + 0.75(%Mn) − 5.7(%C)…”

Section: Discussionmentioning

confidence: 99%

Effect of Cold Rolling on the Microstructural Evolution and Mechanical Properties of Fe-25Mn-3Si-3Al-0.3Nb TWIP Steel

Guo²,

He³

et al. 2022

Coatings

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The microstructural evolution, deformation mechanism and mechanical properties of Fe-25Mn-3Si-3Al-0.3Nb steel in the process of cold rolling were studied by optical microscopy, scanning microscopy, transmission electron microscopy, X-ray diffractometry, tensile testing and microhardness tests. A high-density dislocation structure and a small number of strain-induced twins appeared in the microstructure of the steel at 30% strain. At 50% strain, the strain-induced twins in austenite increased conspicuously, and the lamella thickness of the twins decreased. At 70% strain, the original grains were clearly refined by the micro-shear bands and twinning intersections to form a large number of sub-grains, and some sub-grains were at the nanoscale. The steel still remained a single-phase austenite during cold rolling even if the strain was as high as 70%. The plastic deformation mechanism of the steel was not changed through the addition of 0.3 wt.% Nb, and both dislocation slipping and twinning were still the fundamental plastic deformation mechanisms for the steel. Furthermore, cold rolling led to a drastic rise in the strength and hardness of the steel, but a remarkable decrease in the elongation. The characteristics of micropore aggregation fractures could always be observed on the fracture surface of static tensile specimens with various strains.

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Effect of Work‐Hardening Mechanisms in Asymmetrically Cyclic‐Loaded Austenitic Stainless Steels on Low‐Cycle and High‐Cycle Fatigue Behavior

Cited by 21 publications

References 56 publications

Advantageous Implications of Reversed Austenite for the Tensile Properties of Super 13Cr Martensitic Stainless Steel

Advantageous Implications of Reversed Austenite for the Tensile Properties of Super 13Cr Martensitic Stainless Steel

Biomedical Ti-Nb-Zr Foams Prepared by Means of Thermal Dealloying Process and Electrochemical Modification

Effect of Cold Rolling on the Microstructural Evolution and Mechanical Properties of Fe-25Mn-3Si-3Al-0.3Nb TWIP Steel

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