Deformation processes during tensile straining of ultrafine/nanograined structures formed by reversion in metastable austenitic steels

Misra, R.D.K.; Kumar, B. Ravi; Somani, Mahesh C.; Karjalainen, L.P.

doi:10.1016/j.scriptamat.2008.02.028

Cited by 126 publications

(67 citation statements)

References 17 publications

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“…Recently, the combination of high strength and high ductility in ultrafine-grained (UFG) structured ASS were achieved via operating severe deformation and reversion annealing treatment [4,5]. There are numerous recent papers discussing the deformation mechanisms in UFG steels from the microscopic or macroscopic view using conventional tensile testing and nanoindentation with TEM examination [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Gong

et al. 2017

Metals

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Eighty percent heavy cold thickness reduction and reversion transformation in the temperature range 700-950 • C for 60 s were performed to obtain the reverted ultrafine-grained (UFG) structure in 304 austenitic stainless steel. Through mechanical property experiments and transmission electron microscopy (TEM) of micro deformation of the UFG austenite structure, the tensile fractographs showed that for specimens annealed at 700-950 • C, the most frequent dimple sizes were approximately 0.1-0.3 µm and 1-1.5 µm. With the increase in annealing temperature, the dimple size distribution of nano-sized grains turned to micron-size. TEM micro deformation experiments showed that specimens annealed at 700 • C tended to crack quickly. In the grain annealed at 870 • C, partial dislocations were irregularly separated in the crystal or piled up normal to the grain boundaries; stacking faults were blocked by grain boundaries of small grains; twins held back the glide of the dislocations. In the grain annealed at 950 • C, the deformation twins were perpendicular to ε martensite. Fine grain was considered a strengthening phase in the UFG structure and difficult to break.

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Section: Introductionmentioning

confidence: 99%

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Gong

et al. 2017

Metals

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“…The UFG microstructure was produced by means of phase-reversion annealing of heavily cold-deformed austenite. [18,19] Specifically, the coarsegrained (CG) samples were first processed by ECAP at room temperature (RT) for six passes, which produced a high volume fraction ( ∼ 70%) of deformationinduced martensite with a mean grain size of ∼ 90 nm. [20] This was followed by annealing at 625°C for 60 min, which reversely transformed all martensite back to austenite with ultrafine grain sizes and high density of nanotwins.…”

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An Ideal Ultrafine-Grained Structure for High Strength and High Ductility

Huang

Wang

et al. 2014

Materials Research Letters

101

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“…Their only drawback is that the biocompatibility of austenitic steel is obviously inferior to that calcium phosphate and bioactive glass. Misra et al [2][3][4][5] have authored several recent reviews related to the biomedical applications of ultrafine-grained steel. They noted that nanocrystals with sizes of 500 nm or less tend to improve cell viability and promote the formation of bone lipoprotein.…”

Section: Introductionmentioning

confidence: 99%

Reverse-transformation austenite structure control with micro/nanometer size

Niu

Fengjuan³

et al. 2017

Int J Miner Metall Mater

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Abstract:To control the reverse-transformation austenite structure through manipulation of the micro/nanometer grain structure, the influences of cold deformation and annealing parameters on the microstructure evolution and mechanical properties of 316L austenitic stainless steel were investigated. The samples were first cold-rolled, and then samples deformed to different extents were annealed at different temperatures. The microstructure evolutions were analyzed by optical microscopy, scanning electron microscopy (SEM), magnetic measurements, and X-ray diffraction (XRD); the mechanical properties are also determined by tensile tests. The results showed that the fraction of stain-induced martensite was approximately 72% in the 90% cold-rolled steel. The micro/nanometric microstructure was obtained after reversion annealing at 820-870°C for 60 s. Nearly 100% reversed austenite was obtained in samples annealed at 850°C, where grains with a diameter ≤ 500 nm accounted for 30% and those with a diameter > 0.5 μm accounted for 70%. The micro/nanometer-grain steel exhibited not only a high strength level (approximately 959 MPa) but also a desirable elongation of approximately 45%.

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Deformation processes during tensile straining of ultrafine/nanograined structures formed by reversion in metastable austenitic steels

Cited by 126 publications

References 17 publications

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

Studying Mechanical Properties and Micro Deformation of Ultrafine-Grained Structures in Austenitic Stainless Steel

An Ideal Ultrafine-Grained Structure for High Strength and High Ductility

Reverse-transformation austenite structure control with micro/nanometer size

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