MICROFRACTRUE MECHANISM OF TA2/A3 EXPLOSIVE CLADDING INTERFACE
(1.Department of Materials Science and Engineering; Central-South University of Technology; Changsha 410083；
2.North-West Institute for Nonferrous Metal Research)
2.North-West Institute for Nonferrous Metal Research)
Abstract: In-situ SEM observations on the TA2/A3 explosive cladding interfaces had been performed to examine their microfracture behaviour. The important conclusions of the study were summarized as follows. The microfracture mechanism of explosive cladding TA2/A3 interface are:(1) microcracks initiate inside the swirls or inside the molten material as well as on the boundary between the molten material and the A3 matrix, which penetrate into the nearby A3 matrix in the direction normal to the tensile loading direction under the action of the cracktip stress field, (2) at the same time of the action of mechanism(1), microcracks initiate along the TA2/A3 interface,and link up under the tensile load. Terminal cleavage fracture takes place mainly in the recrystallized and grain abnormal growth region on the A3 side in the vicinity of TA2/A3 interface. No crack nucleation and propagation inside the adiabatic shear band (ASB) on the TA2 side were observed under the tensile load at room temperature.It ...更多is necessary to avoid the jetting molten material wrapped up in the swirl by controlling the collision parameters.
Key words: microfracture mechanism explosive cladding interface