基于有限元数值模拟的TC4合金β固溶处理的组织预测  

Microstructure prediction of Ti-6Al-4V alloy during β solution treatment with finite element numerical simulation

作　　者：王佳纬[1] 徐骏[1] 韩利战[1] 顾剑锋[1] 

机构地区：[1]上海交通大学材料科学与工程学院材料改性与数值模拟研究所,上海200240

出　　处：《材料热处理学报》2016年第11期161-165,共5页Transactions of Materials and Heat Treatment

摘　　要：TC4合金β固溶过程中随着α相析出分数的增加,未分解β相的成分和Ms点也随之不断改变。本文建立了此过程的温度和相变耦合的数值模型,并利用有限元方法预测了β固溶端淬试样中的组织分布,即距离端淬试样喷水面不同位置处各相体积分数。通过硬度测试和组织表征验证了模拟结果的准确性,同时讨论了β固溶处理后组织分布特征及内在原因,并确定了完全获得α＇的临界冷速为93℃/s,冷速介于93℃/s与18℃/s之间得到α＇和α混合组织,冷速介于1～18℃/s之间时可得到α＇、α和未分解β的混合组织,冷速小于1℃/s得到α和未分解β的混合组织。本文的工作建立了显微组织分布与工艺参数的关系,可达到指导和优化工艺流程的目的。The composition and Mspoint of undecomposed β phase change corresponding to the increasing fraction of α phase formed during β solution treatment of TC4 alloy. The numerical model coupling temperature and transformation was established and the microstructure distribution in a Jominy testing specimen subjected to solution treatment had been predicted by finite element method（ FEM）. The accuracy of simulation results was validated by hardness measurement and microstructure characterization. The microstructure distribution characteristics and its formation mechanism were discussed,and the critical cooling rate for different phases was determined. The cooling rate for obtaining full α＇ is above 93 ℃ / s,for α＇ and α is between 93 ℃ / s and 18 ℃ / s,for α＇、α and undecomposed β is between 18 ℃ / s and 1 ℃ / s,for α and undecomposed β is less than 1 ℃ / s. This work established relationships between process parameters and microstructure profiles of products,which will contribute to the optimization of manufacturing process.

关 键 词：钛合金 β固溶处理 数值模拟 有限元方法 

分 类 号：TG146.2[一般工业技术—材料科学与工程]