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The production attempt of Fe-Nb-B-Zr and Fe-Nb-B-Y system alloys by die pressure casting method

Pilarczyk W., Kucharczyk M.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 61, nr 2

222-228

Purpose: The purpose of this article was to investigate the possibility of the production of Fe-Nb-B bulk metallic alloys with additions of yttrium and zirconium elements. Furthermore, this paper tends to present the structure and selected properties of obtained alloys. In this article the influence of an argon atmosphere on casting process was observed too. Design/methodology/approach: The production attempts were performed on Fe-Nb-B-Zr and Fe-Nb-B-Y system alloys in form of a plate. Master alloy ingots with compositions of Fe72B22Y4Nb2 and Fe71(Nb0.8Zr0.2)6B23 were prepared by induction melting of pure Fe, Nb, B, Y and Fe, Nb, B, Zr elements in an argon atmosphere. The ingots have been crushed and then the investigated material was cast with and without a protective atmosphere. The investigated materials were cast in form of a plate with thickness of 1 mm. The structure analysis of the studied materials in as-cast state was carried out using X-ray diffraction (XRD) and microscopic observation. The thermal properties of the alloys were examined by DSC methods. The measurments of the hardness were performed with the Vickers method. Findings: The Fe-Nb-B-Y and Fe-Nb-B-Zr system alloys in form of a plate were produced by die pressure casting method. The investigation methods revealed that the studied as-cast alloys were crystalline. The structure of the obtained plates is rather fine-grained and there were not found any impurities and undesirable phases inside the materials. The results of calorimetric curves confirm that all tested samples are crystalline. Practical implications: To extend the potential applications of the Fe-based BMGs, amorphous alloys with larger critical sizes and better processability are required. The Fe-Nb-B-Zr and Fe-Nb-B-Y bulk metallic glasses obtained by die pressure casting method can be used for production of telecommunications devices, sensors or low-energy transformers. These materials exhibit excellent mechanical and soft magnetic properties. Originality/value: An overall presentation of an influence of the yttrium and zirconium additions on the attempt of forming Fe72B22Y4Nb2 and Fe71(Nb0.8Zr0.2)6B23 alloys. The chemical composition of these alloys was tested in our laboratory for the first time.

Wytwarzanie amorficznie krystalizujących, umacnianych cząstkami materiałów na bazie żelaza dla przemysłu papierniczego

Wielage B., Lampke T., Pokhmurska H., Rupprecht C.

Przegląd Spawalnictwa

2009

R. 81, nr 9

37-40

W dziedzinie natryskiwania cieplnego cermetale sprawdziły się jako materiały do ochrony powierzchni przed zużyciem. Szerokie ich zastosowanie utrudnia często wysoka cena materiałów powłokowych i aspekty ochrony środowiska, szczególnie przy zastosowaniu osnowy na bazie niklu albo kobaltu. W ramach kooperacji różnych niemieckich instytutów badawczych, zrzeszonych w klastrze IGF/DFG "Thermisches Spritzen", rozwijane są w celowy sposób korzystne cenowo rozwiązania alternatywne o nowych właściwościach. W przedstawionej pracy opisano metodykę wytwarzania i nanoszenia stopów na bazie żelaza umocnionych cząstkami, z ukształtowaną w obszarze nanotechnologii strukturą. Materiałem osnowy były wysokostopowe stale, do których w procesie wysokoenergetycznego mielenia wprowadzano materiał umacniający CrB2. Poprzez wybór odpowiednich parametrów mielenia można w określony sposób wpływać na kształtowanie struktury i stopień amorfizacji stopu, aby otrzymać zamierzony nanokrystaliczny stan. W wyniku dalszej obróbki w procesie naddźwiękowego natryskiwania płomieniowego (HVOF) możliwe jest przeniesienie cząstek o tej mikrostrukturze do powłoki. Badania otrzymanych powłok wykazują ich niewielką porowatość i dużą twardość powyżej 1000 HV0,3.

In the field of thermal spraying, ceramets turned out to be useful as materials for protection of surfaces against wear. Their wide application is frequently made difficult by a high price of coat materials and environment protection aspects, particularly when using the matrix on the base of nickel or cobalt. Within co-operation of different German research institutes, associated in the IGF/DFG ,,Thermisches Spritzen", alternative solutions of new properties and with better prices are developed in the purposeful way. In the work presented, the methodology of manufacturing and spraying of alloys on the base of iron strengthened with particles, with a structure configured in the nanotechnology area is described. Matrix materials were high-alloys steels, to which during the high-energy milling process the CrB2 strengthened material was introduced. Through selection of proper parameters of milling it is possible to influence in a specified way on forming of a structure and a degree of rendering amorphous of alloy to obtain the intended nanocrystalline structure. As a result of their further processing in the process of ultrasonic flame spraying (HVOF) it is possible to transport the particles of that microstructure to the coating. Tests of coatings obtained show their small porosity and high hardness, more than 1000 HV0,3.