Microstructure, Texture, and Formability of Nb+Ti Stabilized High Purity Ferritic Stainless Steel

Du, Wei; Jiang, Laizhu; Sun, Qiang; Liu, Zhenyu; Zhang, Xin

doi:10.1016/s1006-706x(10)60113-6

Cited by 30 publications

(21 citation statements)

References 13 publications

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“…Studies report that the

true{112 true} true〈 110 true〉

and

true{001 true} true〈 110 true〉

grains have a lower stored energy than do the

true{111 true} // N . D

. Due to the low stored energy in

true{112 true} true〈 110 true〉

and

true{001 true} true〈 110 true〉

grains (low Taylor factor), the recrystallization rate is very low . Thus, these grains can be consumed in the final stages of recrystallization by the recrystallized grains or remain as recovered grains.…”

Section: Discussionmentioning

confidence: 99%

Effects of Annealing Conditions on Recrystallization, Texture, and Average Normal Anisotropy Coefficient of a Niobium‐Stabilized Ferritic Stainless Steel

Rodrigues

Alcântara²,

Santos

et al. 2017

steel research int.

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The present study investigates the influence of the heating rate on annealing, microstructure, recrystallization, texture, and the average normal anisotropy coefficient, r value, of a niobium-stabilized ferritic stainless steel (i.e., an ASTM 430-type steel). Experiments with 0.10 and 41.5 8C s À1 heating rates are performed after 85% cold rolling. The sample's characterization is performed by optical microscopy, transmission electron microscopy, electron backscatter diffraction, and hardness tests. The tensile tests are performed to determine the r value and the Dr value. The results show that the extent of recrystallization and the average grain size decreases significantly when the heating rate is raised. This increased heating rate causes a weakening of g-fiber and of the 334 f gh483i and 554 f gh225i components, and leads to an even more randomized recrystallization texture. The r value after having achieved full recrystallization is improved when the heating rate is reduced. The r ¼ 1:99 is obtained for g=u ¼ 5:11 with a lower heating rate. These observed differences in recrystallization, grain size, and recrystallization texture are mainly related to the nucleation rate during annealing. The high intensity of the g-fiber is attributed to the number advantage of g-fiber grains after full recrystallization.[ Ã ] Dr.

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“…Studies report that the

true{112 true} true〈 110 true〉

and

true{001 true} true〈 110 true〉

grains have a lower stored energy than do the

true{111 true} // N . D

. Due to the low stored energy in

true{112 true} true〈 110 true〉

and

true{001 true} true〈 110 true〉

Section: Discussionmentioning

confidence: 99%

Effects of Annealing Conditions on Recrystallization, Texture, and Average Normal Anisotropy Coefficient of a Niobium‐Stabilized Ferritic Stainless Steel

Rodrigues

Alcântara²,

Santos

et al. 2017

steel research int.

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show abstract

“…In addition, the driving force for recrystallization depends on the stored energy, which is related to the crystallographic texture. Some authors 17,24,25 have reported that the γ-fiber grains are able to store more energy than α-fiber grains. Considering the results shown in Table 1 and the cold rolling texture obtained after an 80% reduction for both routes (Fig.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Intermediate Annealing on Nb-Stabilized Ferritic Stainless Steel

Rodrigues

Alcântara²,

Oliveira³

et al. 2017

Mat. Res.

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This study seeks to evaluate the effect of intermediate annealing on the microstructure, texture, and formability of Nb-stabilized ferritic stainless steel. Two routes -direct cold rolling and cold rolling with an intermediate annealing were performed. The total reduction was 80%, 3-0.6 mm and 3-1.2-0.6 mm. The characterization of the samples was conducted using X-ray diffraction, electron backscatter diffraction, and tensile tests to evaluate the formability by the average normal anisotropy coefficient, r ̅ value. The results showed that intermediate annealing promoted the strongest γ-fiber with peak at {111}〈112〉 and weak α-fiber after cold rolling. After the final annealing, it was observed that intermediate annealing reduces the banded microstructure and θ-fiber, and improves the γ-fiber uniformity and the r ̅ value. It is worth noting that the γ-fiber fraction was the same for direct reduction. The increase in r ̅ value was related to the reduction in θ-fiber and the uniformity of texture recrystallization.

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“…5(c) and (e)). It has been reported that TiN is squareshaped and Nb and Ti carbides usually appear to be equiaxed in shape [17,18]. TiN was found to precipitate earlier due to its low solid solution in the matrix.…”

Section: Methodsmentioning

confidence: 99%

The effect of relaxing on the grain refinement of low carbon high strength microalloyed steel produced by compact strip production

Huang

2011

Met. Mater. Int.

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The microstructural characterization of a low carbon high strength microalloyed steel produced by compact strip production in conjunction with relaxation precipitation controlling the transformation technique was investigated. The microstructural observations were analyzed by means of optical microscopy, scanning electron microscopy, transmission electron microscopy and electron backscattering diffraction. The microstructure of the investigated steel consisted of predominantly granular bainite and lots of acicular ferrite and polygonal ferrite. The average crystallographic grain size was approximately 4 mm. Relaxation before fast cooling facilitated the formation of dislocation cells and intragranular acicular ferrite grains. Lath-like or plate-like acicular ferrite partitioned the austenite grains into many smaller parts, and the transformation of granular bainite at lower temperatures was confined to the smaller zones, resulting in smaller grain sizes. The yield strength, elongation and low temperature (−60 o C) impact toughness of the steel plates were 614 MPa, 24.1 %, 116 J, respectively. The excellent combination of mechanical properties was attributed to the formation of fine grains and sub-cellular structures.

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Microstructure, Texture, and Formability of Nb+Ti Stabilized High Purity Ferritic Stainless Steel

Cited by 30 publications

References 13 publications

Effects of Annealing Conditions on Recrystallization, Texture, and Average Normal Anisotropy Coefficient of a Niobium‐Stabilized Ferritic Stainless Steel

Effects of Annealing Conditions on Recrystallization, Texture, and Average Normal Anisotropy Coefficient of a Niobium‐Stabilized Ferritic Stainless Steel

Evaluation of Intermediate Annealing on Nb-Stabilized Ferritic Stainless Steel

The effect of relaxing on the grain refinement of low carbon high strength microalloyed steel produced by compact strip production

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