@ARTICLE{Mróz_Marek_Ductile_2020, author={Mróz, Marek and Orłowicz, A.W. and Tupaj, M. and Kupiec, B. and Kawiński, M.}, volume={vol. 20}, number={No 3}, journal={Archives of Foundry Engineering}, pages={37-40}, howpublished={online}, year={2020}, publisher={The Katowice Branch of the Polish Academy of Sciences}, abstract={The study presented in this paper concerned the possibility to apply a heat treatment process to ductile cast-iron thin-walled castings in order to remove excessive quantities of pearlite and eutectic cementite precipitates and thus meet the customer’s requirements. After determining the rates of heating a casting up to and cooling down from 900°C feasible in the used production heat treatment furnace (vh = 300°C/h and vc = 200°C/h, respectively), dilatometric tests were carried out to evaluate temperatures Tgr, TAc1start, TAc1end, TAr1start, and TAr1end. The newly acquired knowledge was the base on which conditions for a single-step ferritizing heat treatment securing disintegration of pearlite were developed as well as those of a two-step ferritization process guaranteeing complete disintegration of cementite and arriving at the required ferrite and pearlite content. A purely ferritic matrix and hardness of 119 HB was secured by the treatment scheme: 920°C for 2 hours / vc = 60°C/h / 720°C for 4 hours. A matrix containing 20–45% of pearlite and hardness of 180–182 HB was obtained by applying: 920°C for 2 hours or 4 hours / vc = 200°C/h to 650°C / ambient air.}, type={Article}, title={Ductile Cast Iron Microstructure Adjustment by Means of Heat Treatment}, URL={http://www.czasopisma.pan.pl/Content/116485/PDF/AFE%203_2020_07.pdf}, doi={10.24425/afe.2020.133327}, keywords={Ductile cast iron, Heat treatment, Microstructure}, }