Annealing behavior of nano-layered steel produced by heavy cold-rolling of lath martensite

Zhao, Xiao-Ling; Tian, Jun; Gao, Yang; Qiao, G-Y.; Zhou, Jie; Wang, W.

doi:10.1016/j.msea.2005.02.007

Cited by 31 publications

(9 citation statements)

References 8 publications

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“…Ordinary deformation experiments either by tensile testing or using rolling deformation indicate that for significant strains, the platelike features remain easily discernible after deformation; however, annealing after such cold-deformation leads to micrographs similar to those illustrated in Fig. 8 [17][18][19]. It might therefore be concluded that the structures illustrated here are generated by warm deformation during the adiabatic heating.…”

Section: Transmission Electron Microscopymentioning

confidence: 62%

Shear band structure in ballistically tested bainitic steels

Fielding

Bhadeshia

2014

Materials Science and Technology

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Adiabatic shear bands represent intense plastic deformation that is localised because the rate at which the heat generated by deformation is greater than that at which it is dissipated. The structure of such bands generated by ballistic testing is examined in order to reveal the governing mechanisms. We attempt to distinguish in particular whether local reaustenitisation occurs, or if the microstructural change are a reflection simply of intense deformation.

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Section: Transmission Electron Microscopymentioning

confidence: 62%

Shear band structure in ballistically tested bainitic steels

Fielding

Bhadeshia

2014

Materials Science and Technology

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“…[11][12][13][14] It has often been reported that the delaminations reduced the notch impact value in the upper shelf region. [8][9][10][15][16][17][18][19] On the other hand, some other publications [5,[20][21][22] showed that the delaminations can improve toughness due to the delamination toughening effect. It will be shown that in the present steel, delamination did not seem to have much influence on the low-temperature toughness at -30°C, similar to the results in Reference 4.…”

Section: Introductionmentioning

confidence: 99%

“…From previous studies, it seems that such features as the bent ferrite-pearlite microstructure, [5] elongated grain shape, [15,16,23] strip microstructure, [3,14] certain texture characteristics, [8,18,21,23,24] decohesion of grain boundaries, [25] segregation of impurity atoms, [26,27] aligned particles, [17,28] and inclusions [3,14,15,23,26,29] could lead to delamination, either individually [8] or cooperatively. [3,14,15,23,26] Although these proposed mechanisms have widely different aspects, they do have the common characteristic that the microstructures are anisotropic.…”

Section: Introductionmentioning

confidence: 99%

Delamination Fracture Related to Tempering in a High-Strength Low-Alloy Steel

Yan

Sha

Zhu

et al. 2009

Metall Mater Trans A

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The delamination or splitting of mechanical test specimens of rolled steel plate is a phenomenon that has been studied for many years. In the present study, splitting during fracture of tensile and Charpy V-notch (CVN) test specimens is examined in a high-strength low-alloy plate steel. It is shown that delamination did not occur in test specimens from plate in the as-rolled condition, but was severe in material tempered in the temperature range 500°C to 650°C. Minor splitting was seen after heating to 200°C, 400°C, and 700°C. Samples that had been triple quenched and tempered to produce a fine equiaxed grain size also did not exhibit splitting. Microstructural and preferred orientation studies are presented and are discussed as they relate to the splitting phenomenon. It is concluded that the elongated as-rolled grains and grain boundary embrittlement resulting from precipitates (carbides and nitrides) formed during reheating were responsible for the delamination.

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“…[22] More recently, severe cold rolling (93.6 pct) was applied to plain carbon steel whose initial microstructure was martensite. [23] Formation of the nanolayered structure of lath martensite with a mean thickness of 18.9 nm took place after heavy cold rolling. Annealing of the cold-rolled structure led to the formation of recrystallized grains of sizes around 52 nm.…”

Section: Introductionmentioning

confidence: 99%

Development of Texture, Microstructure, and Grain Boundary Character Distribution in a High-Strength Boron-Added Interstitial-Free Steel after Severe Cold Rolling and Annealing

Saha

Ray

2009

Metall Mater Trans A

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A high-strength boron-added interstitial-free (IF) steel was subjected to cold rolling by 90 and 98 pct. Both these materials were subjected to annealing at 650°C and 700°C for various lengths of time. An in-depth thorough study has been carried out on the evolution of texture, microstructure, and grain boundary character distribution (GBCD), as a function of cold rolling and annealing. Formation of strain-free nanosize grains at few places has been observed in the severely cold-rolled (98 pct) steel. Ultrafine grains formed in this material at the early stages of annealing. The deformation texture sharpened and the high-angle grain boundary (HAGB) density increased with increasing amount of cold rolling. The intensity of a-fiber components increased at the early stages of annealing, while the c-fiber components were found to predominate at the later stages. Selective growth of grains having orientations {111}h123i and {554}h225i occurred in the 98 pct cold-rolled and annealed material. The textural and microstructural results indicate that in these materials the recrystallization process may be of a continuous type.

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Annealing behavior of nano-layered steel produced by heavy cold-rolling of lath martensite

Cited by 31 publications

References 8 publications

Shear band structure in ballistically tested bainitic steels

Shear band structure in ballistically tested bainitic steels

Delamination Fracture Related to Tempering in a High-Strength Low-Alloy Steel

Development of Texture, Microstructure, and Grain Boundary Character Distribution in a High-Strength Boron-Added Interstitial-Free Steel after Severe Cold Rolling and Annealing

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