Steel powder with a metastable austenite structure

Antsiferov, V. N.; Maslennikov, N. N.; Шацов, А. А.; Smyshlyaeva, T. V.

doi:10.1007/bf00559773

Cited by 7 publications

(2 citation statements)

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“…[11][12][13][14][15] Steel melt filtration is a promising method to remove these last detrimental inclusions prior to casting. [5,[16][17][18][19][20][21][22][23][24] Commonly, ceramic filters are produced by the so-called replication technique.…”

Section: Introductionmentioning

confidence: 99%

Carbon‐Bonded Alumina Spaghetti Filters by Alginate‐Based Robo Gel Casting

et al. 2019

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Metal melt filtration has become very popular over the past decades as it provides the possibility of removing nonmetallic inclusions from metal melts and reduces the amount of flow turbulence during mold filling. However, especially, the filtration of steel melts is associated with particularly harsh conditions which might require special filter solutions regarding increased strength and specified flow path. Herein, a novel approach for the manufacturing of cellular ceramic materials is investigated. Thereby, a slurry containing alginate is pumped into an aqueous solution containing Ca2+ or Ba2+ ions. The natural capability of the alginate for gelation leads to the in situ stiffening of the slurry in contact with the cross‐linking solution. Periodic strut patterns can be realized by moving the nozzle with the aid of a computer‐assisted robotic system. The influence of sodium alginate and solid content on the slurry rheology and the process parameters is analyzed based on a fixed carbon‐bonded alumina composition. Furthermore, alternative combinations of alginate types and alkaline earth sources are tested on their suitability for gel casting and their influence on the residual carbon content after pyrolysis. A suitable filter is successfully applied in steel melt immersion tests.

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Section: Introductionmentioning

confidence: 99%

Carbon‐Bonded Alumina Spaghetti Filters by Alginate‐Based Robo Gel Casting

et al. 2019

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“…Другое перспективное направление работ связано с получением концентрационно-неоднородных трип-сталей и карбидосталей с метастабильным аустенитом [16]. Большой потенциал заключает в себе возможность управления толщиной и объемом зоны деформационного мартенситного превращения, протекающего при разрушении.…”

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On some prospects for further development of Academician V.N. Antsiferov ideas in the field of structural powder materials

Dorofeyev

2019

Izv. VUZ. Poroshk. Met.

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The paper discusses the further development of some ideas of V.N. Antsiferov and the scholar school created by him in obtaining structural powder materials and products. The prospects for obtaining concentration-inhomogeneous steels and trip-steels are noted. The great potential lies in the control of the thickness and volume of the zone of deformation martensitic transformation occurring during fracture. It is advisable to continue the preparation of fullerene- and nitrogen-containing powder compositions and to study the structural heredity of powder steels. The possibility of the synthesis of fullerene-containing phases during the liquidphase sintering of the iron–cast iron and iron–graphite compositions and their subsequent redistribution in the bulk of the material during dynamic hot pressing is worth noticing. Producing nitrogen-containing steels by mechanical activation of powders followed by sintering in dissociated ammonia is advisable to use for obtaining not only wear-and corrosion-resistant materials, but also heat-resistant ones. The studies on the decomposition of supercooled austenite in powder steels of various doping systems with different technological backgroung (sintered, hot-deformed, infiltrated, etc.) are promising. The potential for development is the research of hot-deformed concentration-inhomogeneous materials, obtained, in particular, on the basis of powders of the Distaloy type. The techniques developed by the Antsiferov’s school are significant. The most important one is the method for determining the concentration variation coefficient, as well as a magnetometric complex and a mathematical model, which makes it possible to predict the decomposition of supercooled austenite. Antsiferov’s works can be used for obtaining lean powder steels with the lower bainite structure, which provides the optimal combination of strength and toughness.

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