TY - JOUR N2 - One type of spheroidal cast iron, with additions of 0.51% Cu and 0.72% Ni, was subjected to precipitation hardening. Assuming that the greatest increase in hardness after the shortest time of ageing is facilitated by chemical homogenisation and fragmentation of cast iron grain matrix, precipitation hardening after pre-normalisation was executed. Hardness (HB), microhardness (HV), qualitative and quantitative metalographic (LM, SEM) and X-ray structural (XRD) tests were performed. The acquired result of 13.2% increase in hardness after ca. 5-hour ageing of pre-normalised cast iron confirmed the assumption. L1 - http://www.czasopisma.pan.pl/Content/88222/PDF/18_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/88222 PY - 2014 IS - No 3 DO - 10.2478/afe-2014-0068 KW - Heat treatment KW - precipitation hardening KW - Low-alloy spheroidal cast iron A1 - Szykowny, T. A1 - Trepczyńska-Łent, M. A1 - Giętka, T. A1 - Romanowski, Ł. PB - The Katowice Branch of the Polish Academy of Sciences DA - 2014 T1 - A Study of Effects of Precipitation Hardening of Low-Alloy Copper-Nickel Spheroidal Cast Iron UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/88222 T2 - Archives of Foundry Engineering ER -