Martensite Nucleation at Grain Boundaries Containing Intrinsic Grain Boundary Dislocations

Song, Taejin; Cooman, Bruno C. De

doi:10.2355/isijinternational.54.2394

Cited by 22 publications

(14 citation statements)

References 34 publications

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“…The experimental studies have shown that the grain boundaries (GBs) and triple junctions (TJs) are additional heterogeneities favourable for the M nucleation in the polycrystalline samples of such phase-changing materials [27][28][29][30][31][32][33][34][35][36][37], which was also confirmed through atomistic simulations [38][39][40][41][42]. In particular, the parameters such as the grain orientation distribution (see, e.g.…”

Section: Introductionmentioning

confidence: 78%

“…The temperatures of M nucleation from the GBs are usually significantly higher than the homogeneous transformation temperature of M [28,29]. The start and finish temperatures for both the forward (A → M) and the reverse (M → A) transformations from the tilt GBs are much higher than that for the twist GBs [28,32,38,39]. The reason for this was attributed to the local stress fields associated with the intrinsic dislocations in the low angle tilt GBs [28,32].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the parameters such as the grain orientation distribution (see, e.g. [1,36,42,43], and the references therein), average grain size [31,44,45], type of the GBs (tilt or twist) [28,32,39], GB energy change during MTs [27], stress concentration within the GBs during transformations [33,36,46], degree of reduction in symmetry from A to M [43,47], and direction of loadings [22] have been observed to play an important role on nucleation and evolution of very rich martensitic microstructures. The MTs in nanocrystalline materials, which contain a large volume fraction of the GBs and TJs, are greatly influenced by these heterogeneous sites [48,49].…”

Section: Introductionmentioning

confidence: 99%

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Grain boundary-induced martensitic transformations: A phase-field study of nucleation, size-effect, triple junction-effect, microstructures, and compatibility at the nanoscale

Basak¹

2022

Preprint

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An original thermodynamically consistent large strains-based multiphase phase-field (PF) approach of Ginzburg-Landau type is developed for studying the grain boundary (GB)-induced martensitic transformations (MTs) in polycrystalline materials at the nanoscale considering the structural stresses within the interfaces. In this general PF approach, N independent order parameters are used for describing the austenite (A)↔martensite (M) transformations and N (> 1) martensitic variants, and another M independent order parameters are considered for describing M (> 1) grains in the polycrystalline samples.The change in the GB energy due to its structural rearrangement during MTs is considered using variable energy for the GB(s) as a function of the order parameter related to the A ↔ M transformation. A rich plot for the temperatures of transformations between the A, premartensite, and M in a bicrystal with a symmetric planar tilt GB are plotted for the varying austenitic GB width. The strong effects of the parameters, including the austenitic GB width, change in GB energy due to MTs, GB misorientation, applied strains, and sample size on heterogeneous nucleation of the phases and the subsequent complex martensitic microstructures evolution are explored in various bicrystals with symmetric or asymmetric planar or circular tilt GBs during the forward and reverse transformations. The triple junction (TJ) energy and the energy and width of the adjacent GBs are also shown to strongly influence the nucleation and microstructures using the tricrystals having three symmetric planar tilt GBs meeting at 120 • dihedral angles. The compatibility of the microstructures across the GBs is studied. The elastic and structural stresses across the GBs and TJ regions are plotted, which is essential for understanding the role of GBs and TJs in materials failure. The plausible reasons for the nonintuitive behaviour of the GBs on martensite nucleation observed in experiments and atomistic simulations are explained.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Grain boundary-induced martensitic transformations: A phase-field study of nucleation, size-effect, triple junction-effect, microstructures, and compatibility at the nanoscale

Basak¹

2022

Preprint

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“…26) This change of the microstructures in steel from austenite to martensite is called martensitic transformation. [29][30][31] The hardening phenomenon of steel through this martensitic transformation is called martensite hardening in this study.…”

Section: Influence Of Natural Scientific Understanding Level About Physical Phenomena In Steelmentioning

confidence: 99%

Influence of Understanding of Physical Phenomena in Materials on Supply Chain Patterns of Steel Products

Nishio

Fujimura

2020

ISIJ Int.

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In this study, supply chain patterns of steel products are investigated from the viewpoints of quality assurance responsibility and understanding of physical phenomena in steel. This study focuses on the differences in supply chain patterns between steel nails for common use and valve springs for the automotive industry. In the supply chain of steel nails for common use, which takes a conventional pattern from raw materials to final products, the quality of each supplier's product is guaranteed just by the Japanese Industrial Standards (JIS), and no supplier takes quality assurance responsibilities beyond its business range. By contrast, in the supply chain of valve springs for automotive use, each supplier takes quality assurance responsibilities for the final product beyond its business range, and the suppliers cooperate with one another to fulfill stringent quality requirements by automotive manufacturers. Therefore, the supply chain pattern of valve springs is different from the conventional pattern of common use steel products like steel nails. It was also found that the supply chain pattern of valve springs can be caused by the insufficient understanding of physical phenomena in steel, martensitic transformation and hardening in this case. This study suggests that the conditions that determine the supply chain pattern of a steel product could be business practices for quality assurance, namely based on standard specifications or users' requirements, and the natural scientific understanding level about physical phenomena in steel. Although this study focuses on steel nails and valve springs, this finding is applicable to other steel products.

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“…A preference for heterogeneous nucleation in Martensitic Transformations (MT) has been evidenced by a wide body of experimental explorations on steels [1][2][3], shape-memory alloys [4][5][6], ceramics [7][8], etc. The heterogeneous processes of nucleation and subsequent growth at various defects present distinct microstructure [9][10], diverse transformation pathways [11][12], and hence give rise to different properties of materials [13][14].…”

Section: Introductionmentioning

confidence: 99%

Landau modeling of dynamical nucleation of martensite at grain boundaries under local stress

Xu¹,

Wang²,

Beltrán³

et al. 2016

Computational Materials Science

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The dynamical nucleation of martensite in polycrystals is simulated by means of Lagrange-Rayleigh dynamics with Landau energetics, which is capable of obtaining the local stress as a result of the interplay of the potential of transformation and external loadings. By monitoring the spatio-temporal distribution of the strain in response to the local stress, we demonstrate that the postcursors, high angle grain boundaries and triple junctions act as favorable heterogeneous nucleation sites corresponding to different loading and cooling conditions, and predict the phase diagram of the nucleation mode of martensite.

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Martensite Nucleation at Grain Boundaries Containing Intrinsic Grain Boundary Dislocations

Cited by 22 publications

References 34 publications

Grain boundary-induced martensitic transformations: A phase-field study of nucleation, size-effect, triple junction-effect, microstructures, and compatibility at the nanoscale

Grain boundary-induced martensitic transformations: A phase-field study of nucleation, size-effect, triple junction-effect, microstructures, and compatibility at the nanoscale

Influence of Understanding of Physical Phenomena in Materials on Supply Chain Patterns of Steel Products

Landau modeling of dynamical nucleation of martensite at grain boundaries under local stress

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