TC17和TC4合金锻件的动态响应及绝热剪切行为

陈钰浩; 闵小华; 张海洋; 戴进财; 周轶群

doi:10.11868/j.issn.1005-5053.2023.000105

TC17和TC4合金锻件的动态响应及绝热剪切行为

doi: 10.11868/j.issn.1005-5053.2023.000105

陈钰浩¹,
闵小华^1, ,,
张海洋^{2, 3},
戴进财¹,
周轶群²

1.
大连理工大学材料科学与工程学院，辽宁大连 116024
2.
中国航发沈阳发动机研究所辽宁省航空发动机冲击动力学重点实验室，沈阳 110042
3.
西北工业大学民航学院，西安 710072

基金项目: 辽宁省航空发动机冲击动力学重点实验室开放基金项目（JC36021050017）；国家自然科学基金项目（52071051）

详细信息

通讯作者:
闵小华（1974—），男，博士，教授，主要从事高性能钛合金研究，联系地址：辽宁省大连市大连理工大学材料科学与工程学院（116024），E-mail: minxiaohua@dlut.edu.cn

中图分类号: TG146.2
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- 被引次数: 0
出版历程
- 收稿日期: 2023-06-15
- 修回日期: 2023-07-20
- 网络出版日期: 2023-10-18
- 刊出日期: 2023-10-01

Dynamic responses and adiabatic shear behaviors of TC17 and TC4 alloy forgings

1.
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
2.
Key Laboratory of Impact Dynamics on Aero Engine, AECC Shenyang Engine Design and Research Institute, Shenyang 110042, China
3.
College of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China

摘要

摘要: 利用SHPB装置研究高应变速率下TC17和TC4合金锻件的动态力学性能，并利用OM、SEM和EBSD分析两种合金的绝热剪切行为。结果表明：随着应变速率的增加，两种合金的强度均呈现出升高趋势，表现出应变速率强化效应；与TC17合金相比，TC4合金在相同应变速率下具有更大的塑性应变和动态吸收能；TC17合金经β锻造后获得网篮组织，板条状α相和残余β相形成了大量的相界面，增加了绝热剪切带（ASB）的形成位置，且ASB在扩展过程中容易出现分叉现象；TC4合金经α+β锻造后具有双态组织，等轴状初生α相具有较好的延展性，提高了合金的动态塑性变形能力，合金中排列较规则的片层状次生α相导致相界面减少，ASB的数目较少且难以分叉；在动态压缩中断条件下，TC17合金中ASB的萌生时刻早，萌生孕育能低；TC17合金的绝热剪切敏感性高于TC4合金，且两种合金的绝热剪切敏感性均随着应变速率增加而升高。
- 整体叶盘 /
- α+β钛合金 /
- 高应变速率 /
- 动态吸收能 /
- 绝热剪切带
Abstract: Titanium alloys are widely used in the manufacture of aero-engine blisks due to their low density, high strength, and excellent performance at medium and high temperatures. However, there are few studies on dynamic mechanical properties and adiabatic shear sensitivities of titanium alloy forgings for blisks. In this work, the dynamic mechanical properties of forged TC17 and TC4 alloys at high strain rates were examined by SHPB apparatus, and OM, SEM, EBSD were used to study the adiabatic shear behaviors of the two kinds of alloy. As the strain rate increases, the strength of both alloys increases, thus exhibiting the strain rate strengthening effect. At the same strain rate, TC4 alloy exhibits higher plastic strain and dynamic absorbed energy than those of TC17 alloy. TC17 alloy obtains a basket-weave microstructure after β forging, in which lath α-phases and residual β phases form more phase interfaces. ASBs tend to form at phase interfaces, which lead to a tendency for ASBs to bifurcate during propagating processes. TC4 alloy obtains a bimodal microstructure after α+β forging, and equiaxed primary α-phases show good ductility, which improve the dynamic plastic deformation ability. The regular arrangement of secondary α-phases results in fewer phase interfaces, leading to the difficulty in bifurcation of ASBs during propagating processes. Under dynamic interrupted compression conditions, ASBs in TC17 alloy are occurred earlier, and the localization energy of ASBs is low. Therefore, TC17 alloy has higher adiabatic shear sensitivity, and adiabatic shear sensitivities of both alloys increase with the increase of strain rates.
- blisk /
- α+β titanium alloy /
- high strain rate /
- dynamic absorbed energy /
- adiabatic shear band

HTML全文

图 1 两种合金在不同应变速率下的真应力-应变曲线以及压缩样品的宏观图　（a）TC17；（b）TC4；（1）真应力-应变曲线；（2）压缩样品宏观图

Figure 1. True stress-strain curves of two kinds of alloy at different strain rates and macro-photographs of compressed samples 　（a）TC17；（b）TC4；（1）true stress-strain curves；（2）macro-photographs of compressed samples

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图 2 TC17和TC4合金　（a）不同应变速率下的强度；（b）不同应变速率下的塑性应变

Figure 2. TC17 and TC4 alloys 　（a）strengths at different strain rates；（b）plastic strains at different strain rates

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图 3 动态吸收能随应变速率的变化

Figure 3. Variations of dynamic absorbed energy with strain rates

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图 4 TC17合金在2000 s⁻¹下变形组织OM和SEM图　（a）试样全貌；（b）ASB形貌；（c）微裂纹形貌；（d）分叉ASB形貌

Figure 4. OM and SEM images of deformation microstructures in TC17 alloy at 2000 s⁻¹ 　（a）full view of specimen；（b）morphology of ASB；（c）morphology of micro crack；（d）morphology of bifurcated ASB

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图 5 TC4合金在2000 s⁻¹下变形组织OM和SEM图　（a）试样全貌；（b）ASB形貌；（c）微孔和微裂纹形貌

Figure 5. OM and SEM images of deformation microstructures in TC4 alloy at 2000 s⁻¹ 　（a）full view of specimen；（b）morphology of ASB；（c）morphology of voids and micro cracks

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图 6 两种合金在2000 s⁻¹下变形组织的EBSD图　（a）TC17；（b）TC4；（1）反极图；（2）相图；（3）kernal平均取向差图

Figure 6. EBSD maps of deformation microstructures of two kinds of alloy at 2000 s⁻¹ 　（a）TC17；（b）TC4；（1）IPF maps；（2）phase maps；（3）KAM maps

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图 7 两种合金在不同高度限位环下的真应力-应变曲线以及压缩样品的宏观图　（a）TC17；（b）TC4；（1）真应力-应变曲线；（2）压缩样品宏观图

Figure 7. True stress-strain curves of two kinds of alloy under different height limit rings and macro-photographs of compressed samples　（a）TC17；（b）TC4；（1）true stress-strain curves；（2）macro-photographs of compressed samples

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图 8 TC17合金在不同真应变下变形组织的OM和SEM图　（a）0.09；（b）0.14；（c）0.16；（1）试样全貌；（2）低倍变形组织及绝热剪切带；（3）高倍变形组织及绝热剪切带

Figure 8. OM and SEM images of deformation microstructures in TC17 alloy at different true strains 　（a）0.09；（b）0.14；（c）0.16；（1）full view of specimen；（2）low deformation microstructures and ASB；（3）high deformation microstructures and ASB

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图 9 TC4合金在不同真应变下试样纵截面变形组织　（a）0.18；（b）0.22；（c）0.24；（1）试样全貌；（2）低倍变形组织及绝热剪切带；（3）高倍变形组织及绝热剪切带

Figure 9. Deformation microstructures of longitudinal-section in TC4 alloy at different true strains 　（a）0.18；（b）0.22；（c）0.24；（1）full view of specimen；（2）low deformation microstructures and ASB；（3）high deformation microstructures and ASB

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图 10 两种合金在不同应变速率下的真应力-时间曲线　（a）TC17；（b）TC4

Figure 10. True stress-time curves of two kinds of alloy at different strain rates 　（a）TC17；（b）TC4

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表 1 TC17和TC4合金在2000 s⁻¹下绝热剪切带萌生的临界应变、萌生时刻和萌生孕育能

Table 1. Critical strain（ε_i）， initiation time（t_i）and localization energy（E_i）of ASBs in TC17 and TC4 alloys at 2000 s⁻¹

Alloy Strain rate/s⁻¹ ε_i t_i/μs E_i /（J·cm^－3）

TC17 2000 0.13 82.3 171
TC4 2000 0.19 122 272

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