锻压技术

开缝芯棒孔挤压强化TC4钛合金疲劳性能研究

英文标题：Research on fatigue properties for TC4 titanium alloy strengthened by slotted mandrel hole extrusion

单位：1. 安阳工学院机械与航空制造工程学院河南安阳 455000 2. 南京航空航天大学江苏省精密与微细制造技术重点实验室江苏南京 210016 3. 南京晨光集团有限责任公司江苏南京 210006 4. 河南科技大学机电工程学院河南洛阳 471003

关键词：开缝芯棒孔挤压强化 TC4钛合金残余应力疲劳性能相对挤压量

分类号：TG376.3

出版年,卷(期):页码：2025,50(6):108-119

摘要：

为了提高TC4钛合金孔试样的疲劳性能，建立了开缝芯棒孔挤压强化三维有限元仿真模型，开展了开缝芯棒孔挤压强化试验与疲劳性能测试，探究了相对挤压量对孔壁微观组织、应力和试样疲劳性能的影响。研究结果表明：相对挤压量e为3%的试样孔壁塑性变形层深度与残余压应力大于e为2%和0%的试样，塑性变形增加了晶粒位错，残余压应力降低了孔壁应力，使其中值疲劳寿命也最大；e为0%、2%和3%试样的平均疲劳条纹宽度分别为1.2、0.9和0.7 μm；e为2%和3%试样的中值疲劳寿命是e为0%试样的1.6和2.1倍。

In order to improve the fatigue performance of TC4 titanium alloy hole specimen, a three-dimensional finite element simulation model of slotted mandrel hole extrusion strengthening was established, slotted mandrel hole extrusion strengthening tests and fatigue performance tests were carried out, and the influences of relative expansion amount on the hole wall microstructure, stress and fatigue performance of specimen were studied. The research results show that the depth of plastic deformation layer and the residual compressive stress for specimen hole wall with a relative extrusion amount e of 3% are greater than those of the specimen with e of 2% and 0%. The plastic deformation increases the grain dislocation, and the residual compressive stress reduces the hole wall stress, causing the median fatigue life of the specimen with e of 3% to be greater than those of the specimen with e of 2% and 0%. The average fatigue fringe widths of the specimen with e of 0%, 2% and 3% are 1.2, 0.9 and 0.7 μm, and the median fatigue life of the specimen with e of 2% and 3% is 1.6 and 2.1 times that of the specimen with e of 0%.

基金项目：

河南省高等学校重点科研项目（25A460025）；国家自然科学基金资助项目（52405446）；河南省重点研发与推广专项（科技公关)（242102221020）；江苏省精密与微细制造技术重点实验室开放基金项目（JSKL2223K01）；安阳工学院博士后科研启动基金项目（BHJ2025004）

作者简介：曹洋（1989-），男，博士，讲师,E-mail：caoyang@ayit.edu.cn;通信作者：刘飞（1989-），男，博士，讲师,E-mail：liufei07104517@163.com

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