The fracture behavior of modified AISI 1140 resulfurized steel containing manganese (1.05 to 1.25%) and sulfur (0.16 to 0.23%) has been studied under controlled fast fracture and fatigue fracture conditions. “C”-shaped ring samples were machined from tubes hammer forged at 700°C by the GFM process (Gesellschaft für Fertigungstechnik und Maschinenbau [AG] manufactured in Steyr, Austria) so as to develop a highly fibered (axial) microstructure. The microstructure of the material was evaluated and compared with the fracture surface morphology as a function of loading history. It was determined that the MnS inclusion stringers were encapsulated within the ferrite phase and that static fracture progressed along the stringer-ferrite interface. Conversely, fatigue cracks as evidenced by the presence of fatigue striations propagated mainly within the ferrite phase.
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