Effect of Various Factors on Grain Boundary Migration in the Weld Metal of an Austenitic Stainless Steel.

Shibata, Shinichi; Watanabe, T.; Mekaru, Shunei; Fukumoto, Isao

doi:10.2207/qjjws.15.100

Cited by 8 publications

(4 citation statements)

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“…In the two-dimensional vertex dynamics model, the right-handside term of Eq. [2], the summation over j in determines 3 ⌺ j its moving direction. When we apply this to the aforementioned migration, it is found that the triple junctions along the axial grains are located above and below each other, as shown in Figure 12(a) (indicated by black arrows).…”

Section: Results Of Gb Migration Simulation In the Weldmentioning

confidence: 99%

“…According to two-dimensional vertex dynamics, [8,9] the velocity of the triple junction at a moment is given as follows: 3 3…”

Section: Two-dimensional Vertex Dynamics Modelmentioning

confidence: 99%

“…The authors have examined the GB behavior in the weld metal from the view of the morphology of the solidification. [2,3] These investigations revealed that GB migration mostly occurred to reduce the GB energy. In addition, the obtained results were in accordance with these of other articles [4][5][6][7] relating to the GB migration in a polycrystalline metal.…”

Section: Introductionmentioning

confidence: 97%

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Direction of grain-boundary migration in the weld metal of an austenitic stainless steel

Shibata

Watanabe

1999

Metall Mater Trans A

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The moving direction of the grain boundary (GB), after solidification in the weld metal of AISI310S stainless steel, was examined through a computer simulation technique using the vertex dynamics model and by observing the microstructure. The results are as follows. (1) The grain-growth exponent in the vertex model was fitted to describe the experimental data. (2) The vertex dynamics model can predict the moving direction of a grain boundary in the weld metal after solidification.

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Section: Results Of Gb Migration Simulation In the Weldmentioning

confidence: 99%

“…According to two-dimensional vertex dynamics, [8,9] the velocity of the triple junction at a moment is given as follows: 3 3…”

Section: Two-dimensional Vertex Dynamics Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Direction of grain-boundary migration in the weld metal of an austenitic stainless steel

Shibata

Watanabe

1999

Metall Mater Trans A

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“…Information on SGBM scattered in the literature since 1961 provides the following basic understanding: (i) SGBM occurs near the solidus temperature (T solidus ) of the alloy 9 , 21 , 22 , 25 , 33 ; (ii) the strain generated during cooling after solidification has a minor or negligible influence based on experiments using specially designed samples 20 − this clarifies an important concern about the underlying mechanism; (iii) tortuous or irregular SGBs are apt to migrate 20 , 34 , but SGBM is not due to grain growth 34 ; and (iv) the main driving force for SGBM is the reduction in the total GB energy 18 , 21 , 25 , 35 , and the GB triple junctions approach equilibrium (straight GBs in 120°–120°–120°) after SGBM 18 . However, compared to the GBM in recrystallisation or grain growth, the fundamental factors affecting SGBM, including alloy composition (solute type and content), cooling rate, solidification characteristics and grain size, remain essentially unexplored.…”

Section: Introductionmentioning

confidence: 99%

Migration of solidification grain boundaries and prediction

Zhang

et al. 2022

Nat Commun

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Solidification processing is essential to the manufacture of various metal products, including additive manufacturing. Solidification grain boundaries (SGBs) result from the solidification of the last liquid film between two abutting grains of different orientations. They can migrate, but unlike normal GB migration, SGB migration (SGBM) decouples SGBs from solidification microsegregation, further affecting material properties. Here, we first show the salient features of SGBM in magnesium-tin alloys solidified with cooling rates of 8−1690 °C/s. A theoretical model is then developed for SGBM in dilute binary alloys, focusing on the effect of solute type and content, and applied to 10 alloy systems with remarkable agreement. SGMB does not depend on cooling rate or time but relates to grain size. It tends to occur athermally. The findings of this study extend perspectives on solidification grain structure formation and control for improved performance (e.g. hot or liquation cracking during reheating, intergranular corrosion or fracture).

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The effect of the surface on grain boundary migration in austenitic stainless steel weld metal

Shibata

Watanabe

2001

Metall Mater Trans A

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The direction of grain boundary (GB) migration that occurs after solidification in the original surface of the weld of an austenitic stainless steel was compared to that in the interior (the depth 100 m from the original surface). The results are as follows. In the interior, the direction of GB migration was decided by the moving direction of the triple junctions that bring about their equilibrium. This equilibrium results from the GB approaching a cross angle of 120 deg with another GB in the vicinity of the triple junction. Meanwhile, in the original surface, the direction of GB migration was decided by the direction that makes the GB plane, which is just at solidification, being perpendicular to the surface. That is, the GB plane migrates to be perpendicular to the original surface. This GB migration was often observed when the angle between the GB plane and the original surface had been less than 40 deg. Furthermore, the amount of the GB migration had rapidly increased with the decrease in the angle. The validity of these results is examined with a discussion of the reduction of the interfacial energy.

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Effect of Various Factors on Grain Boundary Migration in the Weld Metal of an Austenitic Stainless Steel.

Cited by 8 publications

References 0 publications

Direction of grain-boundary migration in the weld metal of an austenitic stainless steel

Direction of grain-boundary migration in the weld metal of an austenitic stainless steel

Migration of solidification grain boundaries and prediction

The effect of the surface on grain boundary migration in austenitic stainless steel weld metal

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