Production of Bulk Ultrafine Grained Steel through Severe Plastic Deformation
In the present research, a combined forward extrusion-equal channel angular pressing (FE-ECAP) was developed and used for production of bulk ultrafine grained steel in the high temperature conditions. In this method, two different deformation steps including forward extrusion and equal channel angular pressing takes place successively in a single die. The deformation process was performed at different deformation start temperatures (800, 930, and 1100 ℃). In addition, 3D finite element simulation was used to predict the hot/warm deformation parameters such as strain and temperature variations within the samples during deformation. The results show that the EF-ECAP process is effective in refining the grains from initial size of 32 μm to final size of 0.9 urn after executing of extrusion and ECAP on as received samples. The main mechanisms of grain refinement were considered to be strain assisted transformation, dynamic straininduced transformation, and continuous dynamic recrystallization.
Mehdi Shaban Ghazani Beitallah Eghbali
Department of Materials Science Engineering,Sahand University of Technology,P.O.Box 51335-1996,Tabriz,Iran
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
583-588
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）