TA15钛合金连接孔滚柱挤压强化参数对残余应力及疲劳寿命的影响

潘新; 张辉; 于家鹤; 王崇

doi:10.13433/j.cnki.1003-8728.20200275

TA15钛合金连接孔滚柱挤压强化参数对残余应力及疲劳寿命的影响

doi: 10.13433/j.cnki.1003-8728.20200275

沈阳飞机工业(集团)有限公司，沈阳　110034

详细信息

作者简介:
潘新（1973−），研究员，研究方向为飞机制造工艺研究与管理工作，panxin@163.com

通讯作者:
张辉，研究员，博士，hui-zhang1978@163.com

中图分类号: V262.1
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- 文章访问数: 83
- HTML全文浏览量: 28
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2020-05-28
- 刊出日期: 2021-11-05

Effects of Roller Expansion Parameters on Residual Stress and Fatigue Life of TA15

Shenyang Aircraft Industry (Group) Co., Ltd., Shenyang 110034, China

摘要

摘要: 滚柱挤压强化是重要的表面处理方法，能够在材料内部形成稳定的残余应力，进而有效提高结构的疲劳性能。针对TA15钛合金开孔结构，滚柱挤压强化参数对残余应力及疲劳寿命的影响规律有待进一步研究。基于Johnson-Cook方程建立了TA15滚柱挤压过程仿真模型，揭示了不同挤压量和摩擦因数下，残余应力的产生、扩展及影响范围，探讨了挤压后孔壁材料在周向及轴向的变形规律；开展了TA15开孔结构疲劳寿命试验，对比研究了挤压强化后疲劳寿命的增益效果。
- 钛合金 /
- 滚柱挤压 /
- 表面强化 /
- 残余应力
Abstract: Roller expansion is one of the most important surface strengthening methods. After experiencing the roller expansion, the fatigue life of the structure can be improved due to the generation of residual stress around the hole. However, how the roller expansion parameters effect the residual stress and fatigue life of TA15 alloy needs to be further investigated. The simulation model for the roller expansion of TA15 alloy is built in terms of the Johnson-Cook law. The generation, extension and working mechanism of residual stress are revealed by considering different interference and friction coefficients. The movement of the materials around the hole is also discussed. The fatigue experiment is conducted to study the improvement of the fatigue life after roller expansion. It is found that the machining parameters has the significant effects on the residual stress and fatigue life.
- Titanium alloy /
- roller expansion /
- surface strengthening /
- residual stress

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图 1 有限元模型构建

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图 2 疲劳试验件尺寸规格

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图 3 仿真应力云图

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图 4 挤压量为0.75%时孔周残余应力仿真与实验值对比

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图 5 孔周残余应力与挤压量关系

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图 6 孔周残余应力最大值与挤压量关系

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图 7 不同摩擦因数对残余应力分布的影响

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图 8 孔径变化和孔周轴向变化

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图 9 孔周疲劳断裂微观形貌

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图 10 不同挤压量下开孔结构疲劳寿命

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表 1 TA15的J-C本构模型参数^[15]

ρ/(kg·m⁻³)	E/GPa	ν	A/MPa	B/MPa	n	C
4510	110	0.31	782.7	498.4	0.28	0.028

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表 2 TA15钛合金的主要成分 %

w(Ti)	基	w(O)	≤0.15
w(Al)	5.5 ~ 7.0	w(N)	≤0.05
w(Mo)	0.5 ~ 2.0	w(Zr)	1.5 ~ 2.5
w(V)	0.8 ~ 2.5	w(C)	≤0.10
w(Fe)	≤0.25	w(H)	≤0.015
w(Si)	≤0.15	w(其余)	≤0.3

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表 3 TA15钛合金主要性能参数

抗拉强度/MPa	屈服强度/MPa	伸长率/%
1030	855	8

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