中文摘要：

采用Deform-3D有限元软件模拟了反复锻压剧烈塑性变形,分析了加工过程中试样的流动、温度、应力以及应变分布。研究发现锻压过程中各部分质点流动的速度大小和方向都不相同。随着起始锻压温度的升高,试样同一部位温升数值逐渐降低。试样内大部分区域在3个方向都承受压应力,有利于细化显微组织的剪切变形始终存在。第一道次锻压完成后试样中应变分布很不均匀,随着加工道次的增加,累积应变及其分布均匀程度都不断提高。

英文摘要：

Simulation was performed on repeated forging severe plastic deformation by＂Deform-3D＂finite element software.The distributions of flow,temperature,stress and strain during processing were analyzed.The results showed that the value and direction of flow velocity for each mass point were different during forging.The value of temperature rise in the same position of sample gradually decreased with the increase of initial forging temperature.Most area of the sample suffered compressive stress in three directions,and shear deformation which was beneficial to refine microstructure always existed.The strain distribution was inhomogeneous in the whole sample after the first pass of forging,and both accumulated strain and strain homogeneity improve as passes number of processing increased.