Inconel 625大型厚壁管挤压动态再结晶演化规律仿真（英文）

DRX rules during extrusion process of large-scale thick-walled Inconel 625 pipe by FE method

基于DEFORM-2D有限元平台,建立能准确预测Inconel 625大型厚壁管挤压过程宏、微观变形行为的有限元模型。揭示关键挤压参数对挤压管动态再结晶平均晶粒尺寸及晶粒分布均匀性的影响规律。研究结果表明,随着坯料初始温度、挤压速度和摩擦因数的增加,管材晶粒分布均匀性呈先增加后降低的趋势;增大挤压比能提高管材组织均匀性;随着坯料初始温度的升高,管材平均晶粒尺寸呈先减小后增大的趋势;挤压比的增大能显著减小管材平均晶粒尺寸;挤压速度和摩擦因数对管材平均晶粒尺寸的影响不明显。

A thermal-mechanical and micro-macro coupled finite element（FE） model for the hot extrusion process of large-scale thick-walled Inconel 625 pipe was developed based on the DEFORM-2D platform.Then,the influence rules of the key extrusion parameters on the average grain size and grain uniformity of the extruded pipe were revealed.The results show that with the increase of initial billet temperature,extrusion speed and friction coefficient,the grain uniformity is firstly improved and then deteriorated.Larger extrusion ratio leads to more uniform grain distribution.With the increase of initial billet temperature,the average grain size of the pipe first decreases and then increases.Additionally,larger extrusion ratio can bring smaller average grain size.The extrusion speed and friction coefficient have slight effects on the average grain size of the extruded pipe.