EUTECTOID POINT SHIFT AND ORIENTATION RELATIONSHIPS BETWEEN FERRITE AND CEMENTITE IN PEARLITE IN A HIGH MAGNETIC FIELD

摘要

The effect of a 12 Tesla magnetic field on microstructure, texture and orientation relationship (OR) between pearlitic ferrite and cementite in a 0.81 C-Fe (wt.%) near eutectoid plain carbon steel is investigated. Results show that the magnetic field shifts the eutectoid composition from 0.77C%wt. to 0.84C%wt. Further calculation showed that this field increases the eutectoid temperature by 29°C. The field applied slightly enhances the <001> fiber component in the transverse field direction. This effect is related to the magnetic dipolar interaction between Fe atoms in the transverse field direction. There are mainly four ORs between pearlitic ferrite and pearlitic cementite that are Isaichev (IS), near Bagaryatsky (Bag) and two near Pitsch-Petch (P-P-1 and P-P-2) ORs in both the field treated and non-field treated samples. However, with field the P-P-2 OR becomes more frequent. The promotion of a magnetic field on the high magnetization phase, i.e., ferrite accounts for the frequent occurrence of P-P 2 OR.