Heterogeneous nanostructure developed in heavily cold-rolled stainless steels and the specific mechanical properties

Miura, Hiromi; Kobayashi, Masakazu; Todaka, Yoshikazu; Watanabe, Chihiro; Aoyagi, Yoshiteru; Sugiura, Norío; Yoshinaga, Naoki

doi:10.1016/j.scriptamat.2017.02.016

Cited by 55 publications

(28 citation statements)

References 15 publications

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“…23) Miura et al explained the rather good elongation of stainless steel with heterogeneous nano- structure by i) weaken texture, ii) twinning-induced plasticity (TWIP), iii) shear-banding induced plasticity. 11,12) The comparable uniform elongation of the heavily cold-rolled samples with those of the MDFed one should be possibly due to suppression of sharp ©001ª{110} texture 11,12) and TWIP effect. 11) In fact, rather good elongation by TWIP is confirmed in SUS316LN stainless steel with heterogeneous nano-structure.…”

Section: Mechanical Propertiesmentioning

confidence: 93%

“…11,12) The comparable uniform elongation of the heavily cold-rolled samples with those of the MDFed one should be possibly due to suppression of sharp ©001ª{110} texture 11,12) and TWIP effect. 11) In fact, rather good elongation by TWIP is confirmed in SUS316LN stainless steel with heterogeneous nano-structure. 10) From the above results and discussion, it is concluded that UFGed structure can be easily achieved by simple heavy cold-rolling and comparable or more superior mechanical properties than those obtained by SPDs can be attained when grain fragmentation takes place dominantly by dense mechanical twinning.…”

Section: Mechanical Propertiesmentioning

confidence: 93%

“…In this way, sharp evolution of ©001ª{110} texture is effectively suppressed. 10,11) It is expected from the above observations of heterogeneous nano-structure, therefore, bendability and ductility would be improved. 12) This will be discussed in detail in the section of 3.3.…”

Section: Microstructure Evolved After Heavy Cold Rollingmentioning

confidence: 94%

“…is reported in the SUS316LN stainless steel with heterogeneous nano-structure. 11,12) Nevertheless, tensile test was carried out only parallel to R.D. in the present study.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 3 more Smart Citations

Comparisons of Microstructures and Mechanical Properties of Heterogeneous Nano-Structure Induced by Heavy Cold Rolling and Ultrafine-Grained Structure by Multi-Directional Forging of Cu–Al Alloy

2019

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Microstructure and mechanical properties induced either by heavy cold rolling or multi-directional forging of CuAl alloy were investigated and compared. While both microstructures were developed mainly by a mechanism of mechanical twinning, the features were completely different. The former exhibited a typical heterogeneous nano-structure where "eye" shaped twin domains were surrounded by deformation bands and they were further embedded in low-angle lamellae. The latter also showed complicated feature where twin domains and ultrafine grains composed of equi-axed nano-grains were randomly distributed. Even while the latter possessed finer grain size, the former showed more superior mechanical properties, yield strength of 863 MPa and ultimate tensile strength of 1168 MPa than the latter, yield strength of 720 MPa and UTS of 870 MPa.

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Section: Mechanical Propertiesmentioning

confidence: 93%

Section: Mechanical Propertiesmentioning

confidence: 93%

Section: Microstructure Evolved After Heavy Cold Rollingmentioning

confidence: 94%

“…is reported in the SUS316LN stainless steel with heterogeneous nano-structure. 11,12) Nevertheless, tensile test was carried out only parallel to R.D. in the present study.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Comparisons of Microstructures and Mechanical Properties of Heterogeneous Nano-Structure Induced by Heavy Cold Rolling and Ultrafine-Grained Structure by Multi-Directional Forging of Cu–Al Alloy

2019

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“…Using these methods, Miura et al successfully fabricated UFGed sheet stainless steels, employing mechanical twinning by means of simple heavy cold rolling. 9) The heavily cold-rolled stainless steel possessed a specific microstructure subdivided by dense mechanical twinning, which they called a "heterogeneous nano-structure" in which all the microstructures were formed by deformation induced nanometer-scale ones. They exhibited excellent mechanical properties of tensile strength over 2.6 GPa and 5% ductility after ageing.…”

Section: Introductionmentioning

confidence: 99%

Static Recrystallization Behavior and Mechanical Properties of Heterogeneous Nanostructured Duplex Phase Stainless Steel

et al. 2020

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Static recrystallization (SRX) behavior and tensile property of a 92% cold-rolled duplex phase stainless steel were investigated. Lamellae structure, in which austenite (£) and ferrite (¡) phases were complicatedly stacked, was developed by heavy cold rolling. The lamellae gradually changed to equi-axed fine grains during annealing at 1023 K and fully SRXed after 1.44 © 10 4 s (4 h). Because of precipitation and its impediment of grain-boundary migration, grain coarsening was strongly suppressed even by prolonged annealing to 2.59 © 10 5 s (72 h). While volume fraction of £ phase was about 30% before annealing, it drastically increased up to 90%. The transformed phase from £ to ¡ by heavy cold rolling re-transformed to stable equilibrium £ at 1023 K and occurrence of SRX. No softening took place even with the occurrence of SRX and exhibited quite high H V hardness of 5.9 GPa due to precipitation, which effectively suppressed grain growth. Tensile strength was barely changed before and after annealing and stayed about 1.5 GPa on average, while ductility rapidly decreased.

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Microstructure and Mechanical Properties of Austenitic Stainless Steels after Dynamic and Post‐Dynamic Recrystallization Treatment

2018

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The effects of dynamic and post-dynamic recrystallization (DRX and post-DRX) on the microstructure and mechanical properties of austenitic stainless steels are critically reviewed. Particularly, the paper is focused on the grain refinement and strengthening by large strain deformation including severe plastic deformation conditions. The DRX and post-DRX microstructures are considered with close relation to the operative recrystallization mechanisms. Specific emphasis is placed upon two recrystallization mechanisms, that is, discontinuous and continuous, and their dependence on the deformation/annealing conditions. The relationships between DRX microstructures and processing conditions are summarized and their effect on post-DRX behavior is clarified. The structural strengthening mechanisms including the grain size and the dislocation density are elaborated.

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Heterogeneous nanostructure developed in heavily cold-rolled stainless steels and the specific mechanical properties

Cited by 55 publications

References 15 publications

Comparisons of Microstructures and Mechanical Properties of Heterogeneous Nano-Structure Induced by Heavy Cold Rolling and Ultrafine-Grained Structure by Multi-Directional Forging of Cu–Al Alloy

Comparisons of Microstructures and Mechanical Properties of Heterogeneous Nano-Structure Induced by Heavy Cold Rolling and Ultrafine-Grained Structure by Multi-Directional Forging of Cu–Al Alloy

Static Recrystallization Behavior and Mechanical Properties of Heterogeneous Nanostructured Duplex Phase Stainless Steel

Microstructure and Mechanical Properties of Austenitic Stainless Steels after Dynamic and Post‐Dynamic Recrystallization Treatment

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