Combination Rule of Σ Values at Triple Junctions in Cubic Polycrystals

Miyazawa, Kun’ichi; Iwasaki, Yasuki; Ito, Kazuma; Ishida, Yōichi

doi:10.1107/s0108767396005934

Cited by 72 publications

(39 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fig. 6 of Miyazawa et al (1996) as an illustration]. Recent experimental study (Gertsman & Bruemmer, 2001) has shown that, while AE3 boundaries are resistant to intergranular stress corrosion cracking in many practically important materials, AE9 boundaries are not.…”

Section: Figurementioning

confidence: 99%

“…A hypothetical polycrystal built of Kelvin's tetrakaidecahedra presented in Fig. 6 of Miyazawa et al (1996) have only four different crystal orientations and contains only the quadruple points of the type we have just considered. In that case, AE multi 27 for the whole polycrystal.…”

Section: Figurementioning

confidence: 99%

“…Let us analyse a quadruple junction or a tetracrystal. Recall (Miyazawa et al, 1996;Gertsman, 2001) that, for a triple junction of CSL boundaries,…”

Section: Csl Multiplicity Factor For Multicrystalsmentioning

confidence: 99%

“…It is easy to see that this polycrystal has AE multi 9 ( AE GB 9). Miyazawa et al (1996) have suggested another variant of a two-dimensional network built of only AE3 and AE9 grain boundaries. The four constituent orientations can be represented as …”

mentioning

confidence: 99%

See 3 more Smart Citations

Coincidence site lattice theory of multicrystalline ensembles

Gertsman

2001

Acta Cryst Sect A

View full text Add to dashboard Cite

It is shown how the coincidence site lattice theory, developed originally for grain boundaries and extended recently to triple junctions, can be applied to more complex ensembles of crystallites with the cubic crystal structure. These include quadruple points, multiple junctions of grains and other multicrystal assemblies. Application of the theory is demonstrated on hypothetical examples, which may help elucidate some practically important problems.

show abstract

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

“…Let us analyse a quadruple junction or a tetracrystal. Recall (Miyazawa et al, 1996;Gertsman, 2001) that, for a triple junction of CSL boundaries,…”

Section: Csl Multiplicity Factor For Multicrystalsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Coincidence site lattice theory of multicrystalline ensembles

Gertsman

2001

Acta Cryst Sect A

View full text Add to dashboard Cite

show abstract

“…Random bond percolation, however, cannot be simply applied to twin-induced GBE because the GBCD produced by twin-induced GBE is under crystallographic constraints at triple junctions according to the S-product rule. 46) Schuh et al 35) showed that as compared with randomly assembled networks, about 50-75 % more resistant boundaries will be required to fragment the susceptible grain boundaries in 2-D GBCD when the Sproduct rule is adapted to the simulation, which accepts the 2-D percolation threshold of 70 % CSL frequency in 304 stainless steel (Fig. 7).…”

Section: Percolation Of Random Boundaries In Gbemmentioning

confidence: 99%

Improvement of Transpassive Intergranular Corrosion Resistance of 304 Austenitic Stainless Steel by Thermomechanical Processing for Twin-induced Grain Boundary Engineering

et al. 2010

View full text Add to dashboard Cite

Grain boundary engineering (GBE) primarily aims to prevent the initiation and propagation of intergranular degradation along grain boundaries by frequent introduction of coincidence site lattice (CSL) boundaries into the grain boundary networks in materials. It has been reported that GBE is effective to prevent passive intergranular corrosion such as sensitization of austenitic stainless steels, but the effect of GBE on transpassive corrosion has not been clarified. In the present study, a twin-induced GBE utilizing optimized thermomechanical processing with small pre-strain and subsequent annealing was applied to introduce very high frequencies of CSL boundaries into type 304 austenitic stainless steels containing different phosphorus concentrations. The resulting steels showed much higher resistance to transpassive intergranular corrosion during the Coriou test, in comparison with the as-received ones. The high CSL frequency resulted in a very low percolation probability of random boundary networks in the over-threshold region and remarkable suppression of intergranular deterioration during GBE.KEY WORDS: grain boundary engineering; coincidence site lattice; thermomechanical processing; austenitic stainless steel; intergranular corrosion.of CSL boundaries into 316 austenitic stainless steel and consequently decreased the susceptibility to intergranular corrosion significantly.Intergranular corrosion of stainless steels can be divided into passive and transpassive corrosion, depending on the electrode potential region of the environment. 19,20) The previous studies have demonstrated that GBE is effective for preventing intergranular corrosion at passive potentials by sensitization due to intergranular carbide precipitation in 304 and 316 austenitic stainless steels. 11,15,16) Meanwhile, intergranular corrosion possibly occurs for stainless steel due to the preferential dissolution of phosphate and/or phosphorus segregated at grain boundaries under corrosion environment at transpassive potentials.21-27) GBE may probably be also effective to suppress the transpassive intergranular corrosion of austenitic stainless steels. The present study aimed to examine the effect of GBE on the transpassive intergranular corrosion of type 304 austenitic stainless steels containing different concentrations of phosphorus. Experimental ProceduresThe chemical compositions (mass%) of two 304 austenitic stainless steels used in the present study are shown in Table 1. One of them was an ordinary commercial 304 stainless steel containing 0.027 % phosphorus, termed "high-P". The other one was specially prepared to contain a low phosphorus concentration of 0.001 %, termed "low-P". The as-received 304 steels were solution heat treated at 1 323 K for 0.5 h, and termed base materials (BMs). The BMs, 6ϫ10ϫ40 mm 3 in size, were thermomechanically processed by a one-step, pre-strain plus annealing process at the similar parameters to the previous study, 11) i.e., cold-rolling by 5 % reduction in thickness and subsequent annealing at 1 220 K f...

show abstract

Grain Boundary Engineering Alloy 706 for Improved High Temperature Performance

Detor¹,

Deal²,

Hanlon³

2012

Superalloys 2012

View full text Add to dashboard Cite

Grain boundary engineering aims to improve material performance by optimizing the structure of interfaces in polycrystalline metals. In the present work we grain boundary engineer the Ni-Fe-based superalloy 706 and measure the effect of this process on high temperature crack growth rate. The microstructure of traditionally processed material is compared to that after grain boundary engineering using electron backscatter diffraction to identify grain boundary character according to the coincidence site lattice model. The incorporation of so called special boundaries is examined in detail through grain size and triple junction distributions. It is shown that the grain boundary engineering process can effectively disrupt the connectivity of general, crack-prone grain boundaries in the microstructure. To test a proposed structure-property relationship, crack growth rate is measured for baseline and grain boundary engineered 706 under high temperature static load -conditions which typically result in an intergranular crack path. We find an order-of-magnitude improvement in crack growth rate at low stress intensities following the grain boundary engineering process. To understand the role of grain boundary engineering in more detail we analyze secondary crack paths to determine which boundary types are truly special (i.e. arrest cracks) for this test condition. We treat the problem in a continuum way, exploring the idea that grain boundaries may become "more special" as their coincident site lattice index decreases. This approach is in contrast to the majority of the literature where a binary classification is typically assumed. The work presented here highlights the potential benefit of grain boundary engineering for improved performance of superalloys and metals in general.

show abstract

Combination Rule of Σ Values at Triple Junctions in Cubic Polycrystals

Cited by 72 publications

References 4 publications

Coincidence site lattice theory of multicrystalline ensembles

Coincidence site lattice theory of multicrystalline ensembles

Improvement of Transpassive Intergranular Corrosion Resistance of 304 Austenitic Stainless Steel by Thermomechanical Processing for Twin-induced Grain Boundary Engineering

Grain Boundary Engineering Alloy 706 for Improved High Temperature Performance

Contact Info

Product

Resources

About