论文部分内容阅读
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。
Based on the DEFORM-2D finite element platform, a finite element model was established to accurately predict macroscopic and microscopic deformation behaviors of Inconel 625 large-scale thick-walled tube during extrusion. The effects of critical extrusion parameters on the average grain size and grain distribution uniformity of dynamic recrystallization of extruded tube were revealed. The results show that with the increase of the initial temperature, extrusion rate and friction coefficient, the uniformity of the pipe grain distribution increases first and then decreases. Increasing the extrusion ratio can improve the uniformity of the pipe structure. With the initial temperature of the billet The average grain size of the pipe tends to decrease firstly and then increase; the increase of the extrusion ratio can obviously reduce the average grain size of the pipe; the influence of the extrusion speed and the friction factor on the average grain size of the pipe does not obvious.