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Stopy Ultralekkie Mg-Li

Białobrzeski A., Saja K., Hübner K.

Przegląd Odlewnictwa

2009

Vol. 59, nr 5-6

276-288

W pracy przedstawiono część wyników badań zrealizowanych w ramach Projektu Badawczego Zamawianego nr. PBZ - KBN - 114/T 08/2004, które obejmowały opracowanie i wykonanie m.in. stanowiska badawczego do topienia i odlewania w atmosferze ochronnej stopów ultralekkich Mg-Li. Opracowano podstawy technologii topienia i odlewania tych stopów tj. składu i ciśnienia atmosferycznego oraz sposobu dozowania składników stopowych (głównie litu). Wykorzystując stanowisko badawcze wykonano serię odlewów próbnych ze stopów podwójnych Mg-Li o zawartości litu w granicach około 3-18% wag. oraz serię odlewów ze stopów potrójnych z Al, Ca i Zn. Wstępnie oszacowano właściwości mechaniczne tych stopów. Wykonano również wytop stopu o masie właściwej poniżej 1 g/cm3 i oszacowano wstępnie jego właściwości fizyko-chemiczne.

A certain part of the results obtained within the Ordered Research Project No. PBZ - KBN - 114/T 08/2004, which encompasses designing and constructing of the experimental stand for melting and casting - in the protecting atmosphere - of ultralight Mg-Li alloys, is presented in the hereby paper. The bases of melting and casting technology of these alloys, which means the composition and pressure of the atmosphere as well as ways of introducing alloy components (mainly lithium) were developed. Utilising the experimental stand the series of sample castings from binary Mg-Li alloys - of a lithium content within 3-18% by weight - as well as the series of castings from ternary alloys of Al, Ca and Zn were made. Mechanical properties of these alloys were roughly estimated. In addition, the alloy casting of a mass density below 1 g/cm3 was performed and the preliminary assessment of its physical and chemical properties carried out.

The low-aluminium cast iron of reduced silicon content treated with cerium mischmetal

Soiński M. S., Susek P., Hübner K., Mierzwa P.

Archives of Foundry Engineering

2008

Vol. 8, iss. 2

123-128

The work presents the effect of cerium mischmetal used in quantities of 0.1 and 0.2 wt-% and ferrosilicon used in quantities from 0.5% to 1.5% on the alloy matrix and the shape of graphite precipitates in the low-aluminium cast iron from seven heats, basing on the examination of its structure. The hypereutectic cast iron of the relatively high carbon content (4.0÷4.2%) at the prior-to-treatment silicon and manganese content equal to ca. 0.6% and ca. 0.04%, respectively, has been examined. It has been found that the performed treatment leads to the change in the alloy matrix from the nearly almost pearlitic to the ferritic-pearlitic one accompanied by changes in the shape of graphite precipitates. Due to applying both of the mentioned substances in the above stated amounts the graphite precipitates in cast iron have taken the shape of nodular and vermicular ones, and no presence of flake graphite has been revealed. A quantitative analysis of the performed treatment i.e. determining the fractions of graphite precipitates of different shapes has been possible by means of a computer image analyser.