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Analiza procesu kucia matrycowego materiałów wieloskładnikowych otrzymanych z proszku niklu i aluminium

100%

Szczepaniec S. , Fludzińska K. , Barton G.

tom R. 53, nr 1

30-37

Przestawiono analizę możliwości kucia matrycowego wyprasek z metalowych materiałów z udziałem faz międzymetalicznych Ni-Al otrzymanych z mieszanki proszków. Badania objęły wpływ konstrukcji narzędzi na płynięcie materiału, które zrealizowano na materiałach modelowych oraz na próbkach wykonanych z mieszanki proszków Ni 78 % mas.- Al 22 % mas. Do symulacji procesu kucia dwuskładnikowych materiałów zaadaptowano procedurę obliczeniową w programie Larstran Shape.

The paper shows the analysis of closed-die forging of PM preforms obtained from a mixture of nickel and aluminium powder. The research of punch construction on material flow was carried out on modelling materials and on the PM preforms from Ni 7 8 % wt.-Al 22 % wt. mixture. The results of a simulation of forming processes of two-component preforms with the Lastran Shape program are presented.

Effect of burnishing on the corrosion properties of Ni-5%Al AND Ni-5%Al-15%Al2O3 coatings obtained by plasma spraying

85%

Starosta R.

tom Vol. 21, No. 1

273--280

The Ni-5%Al alloy coatings and Ni-5% Al-15%Al2O3 composite coatings were obtained by plasma spraying method. The PN120 gun was used. The coatings onto a shaft made of austenitic stainless steel (X5CrNi 18-10) were sprayed. The coatings were subjected to turning, burnishing. The evaluation of corrosion properties were based on the measurements of corrosion current density and corrosion potential (polarization method), the charge transfer resistance and exponent of constant phase element impedance (electrochemical impedance spectroscopy method). Corrosion tests were performed in replacement seawater (3.5% sodium chloride solution). On the basis of studies, the effect of finishing type on the corrosion properties of plasma sprayed coatings has been demonstrated. The lowest corrosion current density was found for Ni-5% Al coatings after burnishing, icorr value equal to 0.96 A/cm2, and the charge transfer resistance was 27007 Ωcm2. The lowest resistance to corrosion of turned Ni-5%Al-15%Al2O3 composite coatings was observed. These coatings were characterized by the following parameters of corrosion process: icorr = 17.64 A/cm2, Rct = 2137 Ωcm2. Burnishing caused increased corrosion resistance of coatings. Due to reduced roughness and waviness are obtained reduction of the area of the actual burnished coatings compared to turned coatings. Thus, it is resulting in reduced values of corrosion current density. After finishing treatment, the plasma sprayed Ni-5%Al-15%Al2O3 coatings characterized by lower corrosion resistance compared to the alloy coating. The presence of the reinforcing phase in the coating promotes the increase of the porosity. The plasma sprayed coatings on nickel matrix had a tendency to localized corrosion in sodium chloride solution.