Grain Boundary Migration in Fe-3%Si Bicrystal

Tsurekawa, Sadahiro; Ueda, Tetsufumi; Ichikawa, Kunihiko; Nakashima, Hideharu; Yoshitomi, Yasunari; Yoshinaga, Hideo

doi:10.4028/www.scientific.net/msf.204-206.221

Cited by 34 publications

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Section: Resultssupporting

confidence: 72%

“…Although Tsurekawa et al 30) interpreted their results in terms of segregation effect (because they apparently thought that the non-linear v(F) was inconsistent with singular grain boundaries), their results, specially with the kinked grain boundary shapes, appear to be more consistent with the grain boundary roughening transition. The results of Tsurekawa et al 30) and this experiment thus provide fairly consistent evidences for the grain boundary roughening transition in this alloy.Hall et al 45) observed that [110] tilt grain boundaries in Fe-3wt%Si sheet specimens annealed at 1 050-1 200°C showed h&v structures at fine scales. It is likely that these grain boundaries were actually rough with curved shapes at the annealing temperatures and the fine scale h&v structures formed during cooling.…”

supporting

confidence: 72%

“…26) The observed difference between the two temperatures is also consistent with the decrease of the grain boundary step free energy associated with the roughening at increasing temperatures. Tsurekawa et al 30) observed furthermore that the grain boundary mobilities increased abruptly in the temperature range between about 1 000 and 1 100°C. This result is also consistent with the grain boundary roughening transition, and the transition temperature range is close to about 1 000°C observed in this experiment.…”

Section: Resultsmentioning

confidence: 99%

“…In 316L stainless steel, the grain boundary defaceting transitions were observed at temperatures between 1150 and 1200°C. 17,18) As briefly mentioned in Introduction, Tsurekawa et al 30) examined grain boundary migration in bicrystals of 3.28 wt% Si-iron specimens. Their microstructures show kinks in both (221) S9 and random boundaries when heat-treated at 997°C.…”

Section: Resultsmentioning

confidence: 99%

“…[13][14][15][16][17][18][27][28][29] For Si-iron, this will be about 780-1 300°C. Previous evidences for possible grain boundary roughening transition in pure Si-iron can be found in the grain boundary migration experiments with bicrystals by Tsurekawa et al 30) …”

Section: Introductionmentioning

confidence: 95%

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Temperature Dependence of Grain Boundary Structure and Grain Growth in Bulk Silicon-Iron.

Choi

Yoon

2003

ISIJ International

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Grain boundary shapes and grain growth in bulk 2.61 wt% silicon-iron have been studied by heat-treating at temperatures between 700 and 1 200°C. Initial microstructure with fairly uniform fine grains has been obtained by recrystallization at 800°C for 5 min after deformation. When subsequently heat-treated at 700 and 800°C, a fraction of the grain boundaries have hill-and-valley shapes with several facet planes or kinks. Some of these facet boundary segments are expected to be singular. Abnormal grain growth occurs at 700 and 800°C and is attributed to step growth of the boundaries. When heat-treated at 1 000°C, all grain boundaries are defaceted with smoothly curved shapes, indicating that they are atomically rough. At temperatures above 1 000°C, normal grain growth occurs, because the rough grain boundaries move continuously. This correlation between grain boundary structure and grain growth is consistent with the earlier observations in other metals and oxides. It is thus shown that the abnormal grain growth in this alloy occurs at low temperatures because of the singular grain boundary structure.KEY WORDS: silicon-iron; silicon-steel; abnormal grain growth; grain boundary faceting; singular grain boundary.ing along the grain boundaries using an image analysis program. For the specimens with fine grains, about 500-2 000 grains were measured, and for those with large grains, about 100-300 grains were measured. The grain boundary shapes were also examined in a transmission electron microscope (TEM). Results and DiscussionWet chemical analysis of the heat-treated bar showed that the Si content was 2.61 wt% and the major impurities were P (0.015 wt%), Ni (0.06 wt%), and Cr (0.01 wt%). The C, Mn, and S contents were about 0.005 wt%. The specimens heat-treated at 800°C for 5 min after compressing to 66.7 % in height had typical primary recrystallization structures with fine grains of 8.7 mm in average radius as shown in Fig. 1. The X-ray pole figure and electron back-scattered pattern (EBSP) analysis of these specimens did not show any macroscopic or microscopic texture. Figure 1 is the initial microstructure for all subsequent heat-treatments at various temperatures to observe the grain growth behavior.The grain growth during the heat-treatment at 600°C was very slow. After 250 h at 600°C, the grains were only slightly larger than those shown in Fig. 1. During the heattreatment at 700°C, typical AGG behavior was observed as shown in the microstructures of Fig. 2, and grain size distributions in Fig. 3. After 3 h, some large grains began to appear as shown in Fig. 2(a), and after 24 h, some grains had grown to about 700 mm radius as shown in Fig. 2(d). In Fig. 3, those large grains that could be clearly identified as the abnormal grains are marked by arrows. The fine matrix grains grew slowly as can be seen in Figs. 2 and 3.When the heat-treatment temperature was increased to 800°C, distinct AGG behavior was again observed during 24 h, but the number density of the abnormal grains was larger than that observed at ...

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Section: Resultssupporting

confidence: 72%

supporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Temperature Dependence of Grain Boundary Structure and Grain Growth in Bulk Silicon-Iron.

Choi

Yoon

2003

ISIJ International

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Behaviors of Normal Grain Growth in Polycrystalline Fe–3%Si Alloys

Mao

Zhang

Yang

2014

steel research int.

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The grain growth processes of model alloys Fe-3%Si-MnS and Fe-3%Si were investigated. The MnS particles did not completely inhibit normal grain growth but drastically reduced growth velocity. Activation enthalpy (57.72 kJ mol À1) and pre-exponential factor (7.82 Â 10 À9 m 2 s À1) for boundary migration obtained by statistical regressive calculations were significantly lower than those obtained by bicrystal investigations. The observations indicated that atoms should be pre-activated before they jump over moving boundaries. Activation enthalpy and pre-exponential factor decreased with increased pre-activation energy. The predominant migrations of strongly curved boundaries and triple junctions during grain growth in polycrystals increased the pre-activation energy, which differed from the simplified behaviors of boundary migration in bicrystals.

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The role of high energy boundaries and coincidence boundaries in the secondary recrystallization of grain-oriented silicon steel

Harase

Shimizu

Kim

et al. 1999

Metals and Materials

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The probability of grains having misorientation angles at 200-45 ~ (I, E20-45) or a E9 orientation relationship (ICE9) was determined using the three dimensional orientation distribution obtained from the (100) pole figure. A primary recrystallized grain-oriented silicon steel specimen capable of evolving a sharp Goss texture was used. It was found that I.E20-45 was higher around the Goss orientation but not the highest in the primary texture. Goss orientation has the highest IcE9 in the primary matrix. The assumption that orientations with a higher I,E20-45 value can be nuclei for secondary recrystallization led to the prediction of secondary recrystallization not being present in the secondary recrystallization texture. However, no such contradictory prediction was made on the assumption that orientations with a higher LY9 value can be nuclei for secondary recrystallization. It is concluded, therefore, that grains with misorientation angles from 20"-45 ' are not important in the selection mechanism of Goss secondary recrystallization.

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Grain Boundary Migration in Fe-3%Si Bicrystal

Cited by 34 publications

References 0 publications

Temperature Dependence of Grain Boundary Structure and Grain Growth in Bulk Silicon-Iron.

Temperature Dependence of Grain Boundary Structure and Grain Growth in Bulk Silicon-Iron.

Behaviors of Normal Grain Growth in Polycrystalline Fe–3%Si Alloys

The role of high energy boundaries and coincidence boundaries in the secondary recrystallization of grain-oriented silicon steel

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