Pearlite Development in Commercial Hadfield Steel by Means of Isothermal Reactions

MARTÍN, M.; RAPOSO, M.; PRAT, O.; GIORDANA, M. F.; MALARRÍA, J.

Metallography, Microstructure, and Analysis

Springer

Año: 2017 vol. 6 p. 591 - 597

2192-9262

The Fe12Mn1C Hadfield steel is an abrasion resistant alloy of high technological relevance for mining and heavy machinery. This composition is susceptible to pearlite formation which is detrimental for the materials ductility. Although its spread use, the study of pearlite formation has been preserved to laboratory conditions which cannot be transferred to industrial practices. This manuscript provides updated information about this phenomenonby constructing the time?temperature-transformation diagram of the alloy between 400 and 600 C. The pearlitic reaction occurs above 450 C and begins on thegrain boundaries. Only 7 min is needed for the transformation to start at 550 C, and a maximum pearlite fraction of 35% is reached after 150 min at this temperature. Results are compared with the Fe12Mn0.8C compositionmostly found in literature. The discussion comprises the effects of carbon and manganese content on the pearlitic reaction with the support of thermodynamics calculations.