TY - JOUR N2 - Impact of surface and volume modification and double filtration during pouring the moulds on basic mechanical properties and creep resistance of nickel superalloys IN-713C and MAR-247 in conditions of accelerated creep of castings made of post-production scrap of these alloys is evaluated in this paper. The conditions of initiation and propagation of cracks in the specimens were analysed with consideration of stereological properties of material macro- and microstructure. It has been proven that in the conditions of hightemperature creep at 980°C and at stress σ = 150 MPa, creep resistance of superalloy MAR-247 is more than 10 times higher than the creep resistance of IN-713C alloy. In case of IN-713C alloy, the creep resistance negligibly depends on macrograin sizes. But, the macrograin size considerably affects the time to failure of specimens made of alloy MAR-247. Creep resistance of specimens made of coarse grain material was 20% higher than the resistance of fine grain materials. L1 - http://www.journals.pan.pl/Content/87038/PDF/03_paper.pdf L2 - http://www.journals.pan.pl/Content/87038 PY - 2012 IS - No 4 DO - 10.2478/v10266-012-0101-2 KW - mechanical properties KW - Nickel superalloys KW - Macrostructure KW - Modification KW - Creep A1 - Cieśla, M. A1 - Binczyk, F. A1 - Mańka, M. PB - The Katowice Branch of the Polish Academy of Sciences DA - 2012 T1 - Impact of Surface and Volume Modification of Nickel Superalloys IN-713C and MAR-247 on High Temperature Creep Resistance UR - http://www.journals.pan.pl/dlibra/publication/edition/87038 T2 - Archives of Foundry Engineering ER -