摘要
基于热-力耦合有限元法,对带大厚法兰轴头锻件的成形过程进行了仿真模拟研究。通过对比分析不同锻造工艺对轴类大法兰端应变场、动态再结晶体积分数(DRX)演化及晶粒尺寸分布特征的影响规律,获得了优化应变梯度分布,提高等效应变,有效消除变形死区,促进动态再结晶,进而细化表层及心部区域晶粒的方案。工艺优化后,相较于平砧成形(晶粒尺寸206~235μm),异形砧成形使锻件晶粒尺寸均匀细化至150~196μm,表层和心部分别细化约25%和17%,有效降低了组织梯度,改善了微观结构均匀性。
Based on the thermo-mechanical coupled finite element method,the forming process of shaft head forging with thick flange was simulated.By comparing and analyzing the influence of different forging processes on the strain field,dynamic recrystallization volume fraction(DRX)evolution and grain size distribution characteristics of the shaft flange end,the scheme of optimizing the strain gradient distribution,improving the equivalent strain,effectively eliminating the deformation dead zone,promoting dynamic recrystallization,and then refining the grains in the surface and core regions was obtained.Compared with the flat anvil forming(grain size 206~235μm),with the special-shaped anvil forming,the grain size of the forging with the flat anvil forming is uniformly refined to 150~196μm,and the surface and core parts are refined by about 25%and 17%,respectively.The microstructure gradient is effectively reduced and the microstructure uniformity is improved.
作者
胡仲林
孙嫘
孟相利
HU Zhonglin;SUN Lei;MENG Xiangli
出处
《大型铸锻件》
2025年第4期30-37,共8页
Heavy Casting and Forging
基金
四川省科技计划项目(2023YFG0076)。
关键词
等效应变
动态再结晶
晶粒细化
有限元模拟
equivalent strain
dynamic recrystallization
refine grain
finite element simulation
finite element simulation
