Mechanism of scale effect on micro rod upsetting deformation analyzed by crystal plasticity model
To analyze the effect of single grain deformation behaviors on microforming process,a crystal plasticity model is developed considering grains at free surface layer as single grains because of their less constriction in plastic deformation from the viewpoints of a metal polycrystalline structure.Based on the rate-dependent crystal plasticity theory,the analysis of the scale effect mechanism on upsetting deformation of micro rods are performed with respect to specimen dimension,original grain orientation and its distribution.The results show that flow stress decreases significantly with the scaling down of the specimen because that the grains at free surface layer can be deformed easily.Distribution of grain orientation has an evident effect on flow stress of the micro specimen,which results in the scatter of flow stress.Then,the effect becomes smaller with the progress of plastic deformation because of the grain orientation turning.
Microforming scale effect crystal plasticity crystal orientation
Cheng Lidong Wang Chunju Guo Bin Wang Zhenlong
School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
国际会议
上海
英文
264-264
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）