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1

Influence of crystallographic orientation on creep resistance of single-crystal superalloy

Kościelniak Barbara, Gancarczyk Kamil, Poręba Marek, Albrecht Robert

Advances in Manufacturing Science and Technology

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2020

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Vol. 44, nr 3

93--98

EN

This paper focuses on the influence of crystallographic orientation on creep resistance of CMSX-4 nickel-based superalloy. The single-crystal rods of CMSX-4 superalloy were manufactured with the use of the Bridgman method at a withdrawal rate of 3 mm/min. The crystallographic orientation of the rods was determined by the X-ray Ω-scan method with OD-EFG diffractometer and the Laue back-reflection technique. The creep tests were performed at a temperature of 982°C and the value of stress σ = 248 MPa. Microstructural investigation before and after the creep test of CMSX-4 superalloy was performed using a scanning electron microscope. The results showed that the distribution of the values of α angle strongly affects the creep resistance of a single-crystal superalloy

2

Wetting ability of Ag(Cu, Zn, Ga) alloys on graphite substrate

Weltsch Z., Lovas A., Cziraki A., Tichy G., Toth A. L.

International Journal of Applied Mechanics and Engineering

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2010

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Vol. 15, no 2

389-395

EN

The temperature dependence of wetting angles (T) of Ag-M based melts (M: Cu, Zn, Ga) on graphite substrates are compared. The slope of (T) is negative, which follows from the Eötvös rule. The difference in the slope arises from the M alloying elements. A texture formation was found in the substrate/drop interphase region after solidification. The enrichment (segregation) of Ag atoms in the interface layer was observed in the Ag-Ga alloy in the solidified structure. The action of the melt temperature was examined also on the degree of texture formation, which seems to be coupled with the magnitude of the contact angle.

3

Influence of Major False - Twist Texturing Parameters on the Structural Properties of Polyamide 6.6 Yarn

Karakaş H. C., Dayioğlu H.

Fibres & Textiles in Eastern Europe

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2004

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Vol. 12, no. 2 (46)

23--28

EN

In this paper, we investigate the effect of texturing parameters in a false-twist draw-texturing process on the mechanical properties and the structure of polyamide yarns. A high-temperature heater was used in the study. The important effects of texturing temperature and time on the mechanical, crimp and structural parameters were studied. Detectable changes in overall crystalline orientation, crystal size and perfection of the crystals as a result of changing the texturing temperature and heater residence time were evaluated. Filament breakage rate was also investigated as a function of the D/Y ratio. An analysis of variance was carried out in order to determine the significance of the results.

PL

Badano wpływ parametrów procesu teksturowania metodą nibyskrętu na właściwości mechaniczne i strukturę przędz poliamidowych. W badaniach zastosowano grzejnik wysokotemperaturowy i analizowano wpływ temperatury teksturowania i czasu na parametry mechaniczne przędzy, jej skręt i parametry strukturalne. Wykryto różnice w ogólnej orientacji krystalicznej, rozmiarach krystalitów i ich doskonałości jako efekt zmian temperatury teksturowania i czasu przebywania przędzy w obrębie grzejnika. Badano również ilość zrywów włókien jakofunkcję stosunku D/Y. Przeprowadzono analizę wariancji z uzyskanych wyników dla określenia ich wiarygodności.