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Effect of Cobalt Aluminate Content and Pouring Temperature on Macrostructure, Tensile Strength and Creep Rupture of Inconel 713C Castings

Rakoczy Ł., Grudzień M., Cygan R., Zielińska-Lipiec A.

Archives of Metallurgy and Materials

2018

Vol. 63, iss. 3

1537--1545

The effect of cobalt aluminate inoculant addition and melt-pouring temperature on the structure and mechanical properties of Ni-based superalloy was studied. The first major move to control the quality of investment cast blades and vanes was the control of grain size. Cobalt aluminate (CoAl2 O4 ) is the most frequently utilized inoculant in the lost-wax casting process of Ni-based superalloys. The inoculant in the prime coat of moulds and pouring temperature play a significant role in grain size control. The finest surface grains were obtained when the internal surface of shell mould was coated with cobalt aluminate and subsequently pouring was at 1480°C. The influence of selected casting parameters and inoculant addition on mechanical properties was investigated on the basis of tensile, creep and hardness testing. The effect of grain refinement on mechanical properties were consistent with established theories. Tests conducted at ambient temperature indicated a beneficial effect of grain refinement both on tensile strength and hardness. In contrast at elevated temperature during creep, the reverse trend was observed.

Analysis of the solidification and properties of plaster cast Al based composites

Egizabal P., García Romero A., Torregaray A.

Archives of Metallurgy and Materials

2012

Vol. 57, iss. 1

119-125

The present work deals with aspects related to the solidification and properties of an Al-Si10Mg/SiC20p alloy cast in plaster moulds. Several strategies were followed to shorten its solidification time such as embedding copper tubes into the mould to make circulate cooling fluids immediately after the casting step. The analysis of cooling curves provided valuable information on the effect of the particles on solidification events. The precipitation of different phases of the MMC takes place at higher temperatures and earlier than in the case of the non reinforced alloy. Particles affect the solidification pattern of the alloy and play a noticeable role in the precipitation of the phases. This fact should be taken into account to design the filling and feeding systems correctly and for modelling and processing parameters as well as in thermal treatments. Eventually samples were obtained under the highest solidification rate conditions to analyse the microstructure and tensile properties of the MMC material.

Praca przedstawia aspekty związane z krzepnięciem i właściwościami stopów Al-Si10Mg/SiC20p odlewanych w formach gipsowych. Aby skrócić czas krzepnięcia stopu testowano kilka strategii, takich jak osadzanie rur miedzianych w formie aby umożliwić obieg cieczy chłodzących natychmiast po odlaniu stopu. Analiza krzywych chłodzenia dostarczyłacennych informacji na temat wpływu cząstek na proces krzepnięcia. Wydzielanie różnych faz w kompozytach metalowo-ceramicznych odbywa się w wyższych temperaturach i wcześniej, niż w przypadku nieumacnianego stopu. Cząstki wpływają na schemat krzepnięcia stopu i odgrywają zauważalną rolę w wydzielaniu faz. Fakt ten powinien być brany pod uwagę przy projektowaniu prawidłowego systemu zalewania formy, modelowaniu parametrów procesu, jak również obróbki cieplnej. Na koniec pobrano próbki otrzymane przy najwyższej szybkości krzepnięcia do analizy mikrostruktury i właściwości wytrzymałościowych kompozytu metalowo-ceramicznego.