Microstructure Evolution of TA1/16MnR Explosive Welded Base Plate

The microstructure evolution of 16MnR steel plate near interface of TA1/16MnR explosive welded plate was investigated by means of transmission electron microscopy (TEM). The results show that from matrix to the interface, both ferrite and ferrite in pearlite constantly transformed with the change of stress, and they both changed into equiaxed crystals at the interface. The equiaxial process of ferrite was as follows. The ferrite produced dislocations because of stress, and the high angle boundary subgrains were formed by reciprocity of dislocations. The dynamic recrystallization was realized by moving of the high angle boundaries. The equiaxial process of ferrite in pearlite was as follows. The hige angle boundaries were formed by subgrains running and the equiaxial process of ferrite in pearlite was realized by the continuous dynamic recrystallization.