Effect of Boron Addition on Microstructure and Properties of Sintered Fe-1.5Mo Powder Materials.

Dudrová, E.; Selecká, Marcela; Burea, Radovan; Kabátová, Margita

doi:10.2355/isijinternational.37.59

Cited by 20 publications

(20 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The energy-dispersive X-ray spectroscopy (EDX) analysis verifies the formation of the Ni–Fe alloy (Figure S11). The observation of the fcc crystal phase (Figure a,b) implies that Ni stabilizes the fcc structure of Ni–Fe alloy, as reported previously …”

Section: Resultssupporting

confidence: 86%

See 1 more Smart Citation

Controlled Growth of Large-Area Uniform Multilayer Hexagonal Boron Nitride as an Effective 2D Substrate

et al. 2018

View full text Add to dashboard Cite

Multilayer hexagonal boron nitride (h-BN) is an ideal insulator for two-dimensional (2D) materials, such as graphene and transition metal dichalcogenides, because h-BN screens out influences from surroundings, allowing one to observe intrinsic physical properties of the 2D materials. However, the synthesis of large and uniform multilayer h-BN is still very challenging because it is difficult to control the segregation process of B and N atoms from metal catalysts during chemical vapor deposition (CVD) growth. Here, we demonstrate CVD growth of multilayer h-BN with high uniformity by using the Ni-Fe alloy film and borazine (BHN) as catalyst and precursor, respectively. Combining Ni and Fe metals tunes the solubilities of B and N atoms and, at the same time, allows one to engineer the metal crystallinity, which stimulates the uniform segregation of multilayer h-BN. Furthermore, we demonstrate that triangular WS grains grown on the h-BN show photoluminescence stronger than that grown on a bare SiO substrate. The PL line width of WS/h-BN (the minimum and mean widths are 24 and 43 meV, respectively) is much narrower than those of WS/SiO (44 and 67 meV), indicating the effectiveness of our CVD-grown multilayer h-BN as an insulating layer. Large-area, multilayer h-BN realized in this work will provide an excellent platform for developing practical applications of 2D materials.

show abstract

Section: Resultssupporting

confidence: 86%

“…In addition, this structural change of the metal catalyst would introduce large strain in the as-grown multilayer h-BN. Second, as the solubilities of B and N atoms in Fe metal are largely different (B, ∼0.1 atom % at 1149 °C; N, ∼8 atom % at 1000 °C), , it is considered that the unbalanced solubility prevents uniform segregation of h-BN.…”

mentioning

confidence: 99%

Controlled Growth of Large-Area Uniform Multilayer Hexagonal Boron Nitride as an Effective 2D Substrate

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In contrary to the plain Fe-B systems, boron diffused from eutectic into the alloyed matrix. It is the reason for microhardness and hardness increase of materials [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The effect of boron liquid phase sintering on properties of Ni-, Mo- and Cr-alloyed structural steels

Selecká¹,

Šalak²,

Danninger³

2003

Journal of Materials Processing Technology

View full text Add to dashboard Cite

Boron is evaluated as the best sintering enhancing element in terms of densifying the iron-based materials by formation the liquid phase. The influence of boron addition (up to 0.6%) on the density, microstructure formation and the strength of the different prealloyed powders were studied. The specimens were sintered at 1200 • C for 60 min in hydrogen. Boron addition caused an increase of specimen density and formation of a new microstructure type. Microstructural analysis showed an interaction of boron with matrix alloying elements. The formation of borides caused the increase of microhardness and hardness values of matrix. The higher density and microhardness expressed in higher strength of materials.

show abstract

“…Mo in Fe is homogenously distributed within the iron powders as it is prealloyed, and the presence of B from master alloy favors the formation of molybdenum borides since the free energy of Mo 2 B and MoB 2 is much lower than the corresponding Fe borides. [17] For both Fe and Fe-Mo systems, the eutectic formation occurs with the following reaction: cFe+ Fe 2 BfiL, and c(Fe, Mo) + (Fe, Mo) 2 BfiL. This eutectic formation will dissolve more Fe and generates more liquid phase resulting in the accommodation of grains, pore elimination, and grain coarsening.…”

Section: Discussionmentioning

confidence: 99%

“…[8] Once the liquid forms, more iron will be dissolved in the liquid, which results in persistent liquid formation. In PM steels, boron is introduced either as elemental boron [7,[9][10][11][12][13][14] or ferroboron, [15][16][17][18][19][20] or master alloy, [21][22][23][24] or compounds like hBN or B 4 C. [25,26] Enhanced density levels were reached with elemental boron addition for both the carbonyl and water-atomized powders. [7] Ferroboron tends to agglomerate, resulting in inhomogeneous density distribution during sintering.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Densification of PM Steels by Liquid Phase Sintering with Boron-Containing Master Alloy

Sundaram

Surreddi

Hryha

et al. 2017

Metall Mater Trans A

View full text Add to dashboard Cite

Reaching high density in PM steels is important for high-performance applications. In this study, liquid phase sintering of PM steels by adding gas-atomized Ni-Mn-B master alloy was investigated for enhancing the density levels of Fe-and Mo-prealloyed steel powder compacts. The results indicated that liquid formation occurs in two stages, beginning with the master alloy melting (LP-1) below and eutectic phase formation (LP-2) above 1373 K (1100°C). Mo and C addition revealed a significant influence on the LP-2 temperatures and hence on the final densification behavior and mechanical properties. Microstructural embrittlement occurs with the formation of continuous boride networks along the grain boundaries, and its severity increases with carbon addition, especially for 2.5 wt pct of master alloy content. Sintering behavior, along with liquid generation, microstructural characteristics, and mechanical testing revealed that the reduced master alloy content from 2.5 to 1.5 wt pct (reaching overall boron content from 0.2 to 0.12 wt pct) was necessary for obtaining good ductility with better mechanical properties. Sintering with Ni-Mn-B master alloy enables the sintering activation by liquid phase formation in two stages to attain high density in PM steels suitable for high-performance applications.

show abstract

Effect of Boron Addition on Microstructure and Properties of Sintered Fe-1.5Mo Powder Materials.

Cited by 20 publications

References 0 publications

Controlled Growth of Large-Area Uniform Multilayer Hexagonal Boron Nitride as an Effective 2D Substrate

Controlled Growth of Large-Area Uniform Multilayer Hexagonal Boron Nitride as an Effective 2D Substrate

The effect of boron liquid phase sintering on properties of Ni-, Mo- and Cr-alloyed structural steels

Enhanced Densification of PM Steels by Liquid Phase Sintering with Boron-Containing Master Alloy

Contact Info

Product

Resources

About