Study of the influence of Cu and Ni on the kinetics of strain-induced martensite in austempered ductile cast iron
Date Issued
2013
Author(s)
Guzman, D.
Navea, L.
Garin, J.
Aguilar, C.
Guzman, A.
DOI
http://dx.doi.org/10.3989/revmetalm.1236
Abstract
The objective of this work was to study the influence of copper and nickel on the kinetics of strain-induced martensite in austempered ductile cast iron. The austempered ductile cast irons were obtained from two ductile cast irons with different copper and nickel contents by means of austempering treatment. The deformation was carried out using a rolling mill. The quantification of the phases was obtained by means of X ray diffraction, while the microstructural characterization was carried out using optical and scanning electron microscopy. It was proved that the kinetics of strain-induced martensite in austempered ductile cast iron can be modeled using the equations proposed by Olson-Cohen and Chang et al. Based on the results obtained from these analyses, it is possible to conclude that the nickel and copper complicate the martensite transformation because these elements increase the staking fault energy of the austenite and its thermodynamic stability.


