Microstructural Characterizations of Maraging Steel Processed by Equal-channel Angular Pressing
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 15o) 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.
Nanocrystalline Maraging steel Boundary misorientation Equal-channel angular pressing (ECAP)
M.X. Yang G. Yang Z.D. Liu C. Wang C.X. Huang
Faculty of Material Science and Engineering, Kunming University of Science and Technology,Kunming 65 Institute for Structural Materials, Central Iron and Steel Research Institute, Beijing, 100081, Chin Department of mechanics, Sichuan University, Chengdu, 610065, china
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
412-416
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）