锻压技术

锻造工艺参数对TC4钛合金锻件残余应力的影响

英文标题：Influence of forging process parameters on residual stress of TC4 titanium alloy forgings

作者：方秀荣邵艳茹陆佳刘留

单位：西安科技大学

分类号：TG319

出版年,卷(期):页码：2021,46(3):1-8

摘要：

针对非等温锻造时TC4钛合金锻件极易产生较大残余应力的问题，依据物理实验，建立并调控仿真模型，通过数值模拟的方法，对不同锻造工艺参数下的TC4钛合金锻件的残余应力进行分析。研究了变形温度、变形程度以及变形速度3个关键参量对TC4钛合金锻件残余应力的影响，揭示了残余应力的变化以及分布规律。结果表明：TC4钛合金锻件的径向残余应力关于中心轴线呈对称分布，但分布不均匀，从外表层至心部，残余应力由拉应力转化为压应力，在中心处应力较为集中；而TC4钛合金锻件的轴向残余应力从上表面到下表面分布较为均匀，且明显小于径向残余应力；关键参量中的变形温度和变形程度对TC4钛合金锻件残余应力的影响较为显著，而变形速度的影响较小，适当提高变形温度和变形速度、减小变形程度，可降低TC4钛合金锻件的残余应力。

For the problem that TC4 titanium alloy forgings were prone to produce large residual stress during non-isothermal forging, the simulation model was established and regulated according to physical experiments, and the residual stresses of TC4 titanium alloy forgings under different forging process parameters were analyzed by numerical simulation method. Then, the influences of three key parameters of deformation temperature, deformation degree and deformation speed on the residual stress of TC4 titanium alloy forgings were studied, and the variation and distribution laws of residual stress were revealed. The results show that the radial residual stress of TC4 titanium alloy forgings is symmetrically distributed about the central axis, but the distribution is not uniform. From the outer surface to the core, the tensile stress is transformed into the compressive stress, and the stress at the center is relatively concentrated, while the axial residual stress of TC4 titanium alloy forgings is more evenly distributed from the upper surface to the lower surface, which is obviously smaller than the radial residual stress. Among the key parameters, the deformation temperature and the deformation degree have a significant influence on the residual stress of TC4 titanium alloy forgings, while the influence of deformation speed is relatively small. Thus, the residual stress of TC4 titanium alloy forgings is reduced by properly increasing the deformation temperature and the deformation speed and reducing the deformation degree.

基金项目：

国家自然科学基金资助项目（51775427）

方秀荣（1971-），女，博士，教授E-mail：fangxr098@163.com

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