Recrystallization and grain growth in high purity austenitic stainless steels

Gavard, L.; Montheillet, F.; Coze, J. Le

doi:10.1016/s1359-6462(98)00276-0

Cited by 30 publications

(25 citation statements)

References 7 publications

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“…5(a)-5(c). 5,7,17) It was observed that the atomic ratio of Nb to Ti contained within these precipitates continually reduced with the increase in austenizing temperature. The composition of Nb to Ti in the precipitates changed from near equal at 1 000°C to Ti-rich (Ti, Nb) C and (Ti, Nb) N at 1 200°C.…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

“…4,5) The associated evolution of particle size and volume fraction produces a change in the pinning force that controls the austenite grain growth through Zener pinning and the microstructural changes. [5][6][7] In steels, austenite grain size is a microstructural parameter that must be carefully controlled during heat treatment. 4,[6][7][8] With conventional approaches (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7] In steels, austenite grain size is a microstructural parameter that must be carefully controlled during heat treatment. 4,[6][7][8] With conventional approaches (e.g. Metallography), the on-line in situ monitoring of austenite grain growth at high temperatures is not feasible.…”

Section: Introductionmentioning

confidence: 99%

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Austenite Grain Growth Kinetics after Isothermal Deformation in Microalloyed Steels with Varying Nb Concentrations

2018

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Grain growth equation constants n, Q and A for Nb bearing steels with the Nb varying from 0.002 wt% to 0.1 wt%, were experimentally determined under reheating and high temperature hot rolling roughing conditions. The constants from these treatments were then used to develop constitutive equations that incorporate the initial grain size D o and a Nb-effect for grain growth predictions in these steels. Comparative analysis of the results showed that the values of the constants generated under rough rolling deformation conditions were slightly higher than those generated under reheating conditions. The activation energy for grain boundary migration Q was found to be in the range of 256 to 572 kJ/mol, the exponential constant n ranged from 2.6 to 6.5 and the material and processing condition's constant A was found to range from 5.23 × 10 11 to 4.96 × 10 28 in all cases as a function of the Nb content. Analysis of the influence of the initial grain size D o showed that any contribution of D o can be neglected unless it is equal or more than 70 percent of the average size of the measured austenite grain size D. A logical degree of precision in predicting austenite grain growth in microalloyed steels with different Nb contents, has been achieved in the current work.

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Section: Transmission Electron Microscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Austenite Grain Growth Kinetics after Isothermal Deformation in Microalloyed Steels with Varying Nb Concentrations

2018

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“…9 shows that between 1 100 and 1 200°C the risk of secondary recrystallization, due to partial dissolution of the MC carbides, is very large. 38,67) Recent work 69) on high purity austenitic stainless steels showed that carbon, even in solid solution, hinders grain growth.…”

Section: Grain Growth and Secondary Recrystallizationmentioning

confidence: 99%

Annealing of Cold-worked Austenitic Stainless Steels.

2003

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This article reviews the phenomena involved during the annealing of cold worked austenitic stainless steels. Initially the cold worked state is discussed, with special emphasis on the formation of deformation induced martensites. Following, the phenomena of martensite reversion, recovery, recrystallization and grain growth are discussed. The interactions between primary recrystallization and precipitation and between precipitate dissolution and secondary recrystallization are dealt with in detail. Finally, the textures resulting from hot and cold working, and from primary and secondary recrystallization, are presented.KEY WORDS: austenitic stainless steels; work hardening; recovery; recrystallization; grain growth; texture.cold working can be correlated to a lower SFE. 39) Deformation twinning is also dependent on SFE and grain size. Low SFE and large grain size favor deformation twinning. Recent work 40) has shown that deformation twin initiation requires a critical deformation (critical dislocation density). The SFE has an indirect effect by increasing dislocation density and strain hardening in low-SFE fcc metals and alloys. 40) Another aspect that must be remembered is that SFE of the ASSs increases with deformation temperature. 41) In summary, depending on the value of the SFE, two different microstructures may be observed in the cold worked ASSs: for a high SFE, a cellular dislocation distribution without DIM and, for a low SFE, a planar dislocation distribution containing DIM. It is worthy of note that deformation bands can be found in both.In terms of recrystallization, the lower is the SFE, keeping all others variables constant, the larger will be the stored energy during deformation and the corresponding driving force for recrystallization. This subject will be discussed later on in greater detail.ASSs are commonly considered to be materials having a low SFE. Actually the SFE of this class of steels are within quite a large range. [42][43][44][45][46][47] Fig. 2(b)). Several interesting features can observed in this figure. Microstructural analysis using optical microscopy, as shown in Fig. 2(a) for a high SFE ASS, does not allow differentiation between high and low SFE austenitic stainless steels after cold working. Furthermore, at the transmission electron microscopy scale deformation bands may be seen eventually (compare Figs. 2(b) and 2(c)). Monteiro and Kestenbach 49) using transmission electron microscopy observed that dislocation substructure is orientation sensitive, i.e., individual grains develop different substructures, according to their specific orientation and the orientation of their neighbours.As previously mentioned, two types of martensite may occur in the ASSs, namely: aЈ-(bcc, ferromagnetic) and e-(hcp, paramagnetic). The typical lattice parameters are: a aЈ ϭ0.2872 nm and a e ϭ0.2532 nm; c e ϭ0.4114 nm Assuming 50) a g ϭ0.3585 nm, we may conclude that the g→aЈ transformation leads to volume increase of about ISIJ International, Vol. 43 (2003) where the contents are in wt%. Since ...

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“…7) However, since a large amount of aЈ martensite is required for the microstructure refinement after cold rolling, this steel composition is strictly limited to those materials with a martensite transformation (Ms) temperature above or near room temperature. For SUS304 type stainless steel, Gavard et al have indicated that the steel showed high recrystallization nucleation frequency but very low grain growth rate only for certain compositions, especially for compositions with C and N. 8) This implies that this approach is not suitable for commercial austenite stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Recrystallization and Grain Growth Behavior in Severe Cold-rolling Deformed SUS316L Steel under Anisothermal Annealing Condition

et al. 2008

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, in the equation is calculated and is found to follow the equation PϭK · exp(0.5/q). Meanwhile, the grain growth exponent, n, for the anisothermally annealed SUS316L steel is also determined and is found to lie between 2.5 and 3.0. On the other hand, EBSD analysis of the evolved microstructure at different heating rates indicates that low heating rate caused partial recrystallization with preferred orientations at the recrystallization finish temperature, while high heating rates above 1 K/s induced the homogeneously nucleated recrystallization microstructure with random orientations and a lognormal type grain size distribution.

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Recrystallization and grain growth in high purity austenitic stainless steels

Cited by 30 publications

References 7 publications

Austenite Grain Growth Kinetics after Isothermal Deformation in Microalloyed Steels with Varying Nb Concentrations

Austenite Grain Growth Kinetics after Isothermal Deformation in Microalloyed Steels with Varying Nb Concentrations

Annealing of Cold-worked Austenitic Stainless Steels.

Recrystallization and Grain Growth Behavior in Severe Cold-rolling Deformed SUS316L Steel under Anisothermal Annealing Condition

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