Evaluation of borides formed on AISI P20 steel

Uslu, I.; Comert, H.; İpek, M.; Özdemir, Ö.; Bindal, C.

doi:10.1016/j.matdes.2005.06.013

Cited by 116 publications

(75 citation statements)

References 15 publications

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“…Generally, the formation of a monophase (Fe 2 B) with sawtooth morphology is more desirable than a double phase layer of FeB and Fe 2 B for industrial applications, because orthorhombic FeB phase is more brittle than tetragonal Fe 2 B phase. 19,20) Furthermore, crack formation is often observed at the FeB/Fe 2 B interface due to substantial difference in coefficient of thermal expansion between them. 21) …”

Section: Microstructure and Characterizationmentioning

confidence: 99%

Catalysis of Rare Earth Element Nd on Boriding of AISI 1045 Steel

et al. 2011

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The present study evaluate the catalysis of Nd2O3 on the boriding of AISI 1045 steel using a 5% Nd2O3-containing boriding agent in a temperature range of 1 213 K to 1 350 K for 2 h-5 h. The morphology and types of borides formed on the steel surface were confirmed by optical microstructure, scanning electron microscopy and X-ray diffraction. The results show that the Nd2O3 has contrary effects on boriding process, i.e. promotion at high temperatures or hindrance at low temperatures. Nd2O3 addition can significantly reduce the activation energy of boride growth at high temperatures, decreased it from 198 kJ/mol to 137 kJ/mol, reduced by 31% in the high temperature range of 1 133 K-1 213 K as compared with that without Nd2O3 addition. The catalysis mechanism of RE element Nd during boriding process was discussed through the analysis of chemical reactions probably occurred in boriding agent, changes in surface morphology and chemical composition.

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Section: Microstructure and Characterizationmentioning

confidence: 99%

Catalysis of Rare Earth Element Nd on Boriding of AISI 1045 Steel

et al. 2011

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“…Anisotropy strength, u, is set at 0.3 whereas the anisotropy mode, $, is set at 2, representing two-fold symmetry. Experimentally, it was observed that, due to the tendency of Fe 2 B crystals to grow along a direction of minimum resistance perpendicular to the external surface, 8) boride structures prefer to have morphology in the form of a columnar shape with 'toothing' characteristics on the tips. [7][8][9][10] As this type of structure has two-fold symmetry, the present simulation work also uses two-fold symmetry for the calculation of eq.…”

Section: Numerical Conditionsmentioning

confidence: 99%

“…In the case of boride growth, it is considered that the morphology of boride structure significantly influences the adhesion bonding between boride layer and the substrate. [7][8][9][10] The interaction between the substrate and boride during the growth process is also considered to determine the kind of morphology of boride structure. It was reported that Fe 2 B boride layers produced by the conventional boronizing process to have a strong (0 0 1) growth texture 11) and grow perpendicular to the surface substrate.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, anisotropy of interfacial energy is also introduced, thereby we can expect anisotropy growth of boride seed as was observed in experimental works. 8,12) To the author's knowledge, the present work is a volunteer for numerical works that evaluate the morphological evolution of Fe 2 B boride. Previous numerical works on boride layer growth have focused on kinetic growth using the mass balance equation as the basic model.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Structure Orientation on the Growth of Fe<SUB>2</SUB>B Boride by Multi-Phase-Field Simulation

et al. 2010

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A morphological evolution of the growth of Fe 2 B boride on steel substrate has been investigated using two dimensional (2D) multi-phasefield (MPF) simulations. In order to evaluate competitive growth between boride seeds during the coating process, variations on boride seed orientation have been implemented. In addition, in order to have anisotropy growth of boride, anisotropy of interfacial energy is considered on the evaluation of phase-field evolution. It was observed that boride seed with structure orientation of 90 shows a preferential growth as compared with the growth of boride seeds at other orientations. On the other hand, competitive growth between boride seeds at different crystal orientations can also be observed, where boride seeds approaching a preferential orientation angle grow faster and suppress the growth of boride seeds at the lower orientation angle. Both of these present observations agree with previous experimental observations that boride seeds tend to grow perpendicular to the substrate surface and the growth of boride seeds in this direction suppress growth in other directions. Additionally, it was observed that the preferential growth of boride is independent of the initial size of the boride seed.

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“…Böylece birçok demir esaslı ve demirdışı metallerin borlanması çalışmasında [10], [13], [30], [31] kullanılan EKbor 2 tozu ile sınırlı sayıdaki çalışmada kullanılan elementel nano bor [9] ve nano hegzagonal bor nitrür tozlarının [12] Ni esaslı alaşımlar üzerindeki kaplama karakteristiklerinin belirlenmesi ve birbirleriyle kıyaslanması amaçlanmıştır.…”

Section: Introductionunclassified