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

Selecká, Marcela; Šalak, Andrej; Danninger, Herbert

doi:10.1016/j.jmatprotec.2003.10.001

Cited by 22 publications

(15 citation statements)

References 7 publications

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“…Nevertheless, the impact energy values obtained are quite impressive ->100 J.cm -2 for 0.10% and 0.15%B when sintering at 1300°C -which indicates that here the desired sintering effect has really been obtained without embrittlement. This agrees with results decribed in [37] that without C, also alloyed steels tolerate fairly high B levels without drop of strength.…”

Section: Binary Iron-boron Systemssupporting

confidence: 93%

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Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Danninger

Vassileva

Gierl‐Mayer

2017

Powder Metallurgy Progress

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Section: Binary Iron-boron Systemssupporting

confidence: 93%

“…As shown e.g. by Selecka et al [37,42], at lower carbon levels sintered steels can tolerate more boron without embrittlement. It seems therefore that a careful balance between the interstitial elements B and C is required to benefit from sinter activation without sacrificing mechanical properties.…”

Section: Ternary Iron-carbon-boronmentioning

confidence: 89%

Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Danninger

Vassileva

Gierl‐Mayer

2017

Powder Metallurgy Progress

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“…The said research fields are still of interest, which can be corroborated with the publication of new papers (22,23).…”

Section: Introductionmentioning

confidence: 74%

Processing and Properties of Distaloy Sa Sintered Alloys with Boron and Carbon

Karwan-Baczewska¹

2015

Archives of Metallurgy and Materials

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Prealloyed iron-based powders, manufactured in Höganäs Company, are used in the automotive parts industry. The properties and life time of such sintered parts depend, first of all, on their chemical composition, the production method of the prealloyed powder as well as on the technology of their consolidation and sintering. One of simpler and conventional methods aimed at increasing the density in sintered products is the process of activated sintering, performed, for example, by adding boron as elementary boron powder. Under this research project obtained were novel sintered materials, based on prealloyed and diffusion bonded powder, type: Distaloy SA, with the following chemical composition: Fe-1.75% Ni-1.5%Cu-0.5%Mo with carbon (0.55%; 0.75%) and boron (0.2%, 0.4% and 0.6%). Distaloy SA samples alloyed with carbon and boron were manufactured by mixing powders in a Turbula mixer, then compressed using a hydraulic press under a pressure of 600 MPa and sintered in a tube furnace at 1473 K, for a 60 minute time, in the hydrogen atmosphere. After the sintering process, there were performed density and porosity measurements as well as hardness tests and mechanical properties were carried out, too. Eventually, analyzed was the effect of boron upon density, hardness and mechanical properties of novel sintered construction parts made from Distaloy SA powder.Keywords: prealloyed and diffusion bonded powder, carbon, boron, sintering, density, hardness, mechanical properties Proszki stopowane na osnowie żelaza produkowane w firmie Höganäs znajdują zastosowanie w produkcji części motoryzacyjnych. Właściwości i czas eksploatacji tych elementów spiekanych zależą przede wszystkim od składu chemicznego i metody wytwarzania proszku stopowanego oraz od technologii jego zagęszczania, i spiekania. Jednym z prostszych i konwencjonalnych sposobów podwyższania gęstości wyrobów spiekanych jest proces aktywowanego spiekania np. poprzez wprowadzenie dodatku boru w postaci elementarnego proszku boru. W niniejszej pracy badawczej wytworzono nowe materiały spiekane z proszku stopowanego i wyżarzanego dyfuzyjnie typu Distaloy SA o następującym składzie chemicznym: Fe-1,75%Ni-1,5%Cu -0,5%Mo z dodatkiem węgla (0,25% i 0,55% ) i boru (0.2%, 0,4% i 0,6%). Próbki z proszku Distaloy SA z dodatkiem węgla i boru otrzymano metodą mieszania proszków w mieszalniku Turbula, następnie prasowania na prasie hydraulicznej pod ciśnieniem 600 MPa i spiekania w piecu rurowym w temperaturze 1473 K, w czasie 60 min., w atmosferze wodoru. Po procesie spiekania przeprowadzono pomiary gęstości oraz porowatości próbek jak również badania twardości i właściwości mechanicznych. Przeanalizowano wpływ dodatku boru na gęstość, twardość i właściwości mechaniczne nowych elementów konstrukcyjnych z proszku Distaloy SA.

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“…[26] Seleckaé t al. [15] observed an increase in density by introducing ferroboron in Fe-Mo-prealloyed systems only when the boron content reaches beyond 0.2 wt pct. The design of master alloy is based on proper selection of alloy systems which can melt at lower melting temperatures so as to enable liquid phase sintering.…”

Section: Introductionmentioning

confidence: 93%

“…[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

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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.

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

Cited by 22 publications

References 7 publications

Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Embrittling Components in Sintered Steels: Comparison of Phosphorus and Boron

Processing and Properties of Distaloy Sa Sintered Alloys with Boron and Carbon

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

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