Microstructural Characterizations of Maraging Steel Processed by Equal-Channel Angular Pressing

M.X. Yang; Gang Yang; Z.D. Liu; C. Wang; C.X. Huang

doi:10.4028/www.scientific.net/MSF.745-746.412

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HomeMaterials Science ForumMaterials Science Forum Vols. 745-746Microstructural Characterizations of Maraging...

Microstructural Characterizations of Maraging Steel Processed by Equal-Channel Angular Pressing

Abstract:

Microstructures of a maraging steel subjected to equal-channel angular pressing (ECAP) up to 16 passes at room temperature were investigated. Electron backscattered diffraction (EBSD) and transmission electron microscopy (TEM) examinations showed that the microstructures of the as-processed samples were characterized by a well-defined lamellar structure. With increasing the number of ECAP passes from 1 to 16, the lamellar spacing was significantly decreased from ~323 nm to ~54 nm, while the volume fraction of high-angle lamellar boundaries (HALBs, having the misorientation larger than 15^o) was obviously increased form ~46% to ~80%. The real lamellar-type nanostructured microstructures were completely accomplished in the tested steel after 8 or more ECAP passes. In addition, the grain refinement mechanism of maraging steel during the processing was discussed in detail.