CAJ | 학술논문

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.
기우DEFORM-2D유한원평태,건립능준학예측Inconel 625대형후벽관제압과정굉、미관변형행위적유한원모형.게시관건제압삼수대제압관동태재결정평균정립척촌급정립분포균균성적영향규률.연구결과표명,수착배료초시온도、제압속도화마찰인수적증가,관재정립분포균균성정선증가후강저적추세;증대제압비능제고관재조직균균성;수착배료초시온도적승고,관재평균정립척촌정선감소후증대적추세;제압비적증대능현저감소관재평균정립척촌;제압속도화마찰인수대관재평균정립척촌적영향불명현.
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.