多层梯度超细晶粒钛强韧化机理研究

刘佳文; 方红梅; 曹丽丽; 张亚; 杨登科

doi:10.7513/j.issn.1004-7638.2023.03.014

多层梯度超细晶粒钛强韧化机理研究

doi: 10.7513/j.issn.1004-7638.2023.03.014

1.
浙江科技学院机械与能源工程学院, 浙江杭州 310023
2.
浙江师范大学工学院, 浙江金华 321004

基金项目: 浙江省重点研发计划项目(2021C01084)。

详细信息

作者简介:
刘佳文，1997年出生，男，江西新余人，硕士研究生，主要研究高性能金属材料，E-mail：2541160167@qq.com

通讯作者:
杨登科，1978年出生，男，教授，硕士生导师，E-mail：dkyang@issp.ac.cn

中图分类号: TF823,TG113.25
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- 文章访问数: 102
- HTML全文浏览量: 16
- PDF下载量: 8
- 被引次数: 0
出版历程
- 收稿日期: 2022-11-03
- 刊出日期: 2023-06-30

Study on the strength and toughness mechanism of multilayered gradient ultrafine-grained titanium

1.
School of Mechanical and Energy Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, Zhejiang, China
2.
College of Engineering, Zhejiang Normal University, Jinhua 321004, Zhejiang, China

摘要

摘要: 针对超细晶粒金属在室温下韧性及加工硬化性能较差的问题，利用低温轧制和表面机械研磨处理工艺,设计和制备了金属材料的微观多层梯度结构，提高了超细晶钛的力学性能及加工硬化能力。通过对多层梯度超细晶粒钛的微观结构观察和试样力学性能测试，结合试样断后截面及表面分析观察，结果表明，多层梯度化微观结构可以提高超细晶金属的加工硬化能力，实现更为缓和的应力分布，从而提高工件失效裂纹的抵抗力。在此基础上提出了一个断裂力学模型来解释多层梯度化结构的止裂效应。
- 超细晶材料 /
- 钛 /
- 增韧 /
- 多层结构 /
- 梯度结构
Abstract: In view of the poor toughness and work hardening performance of ultra-fine grained (UFG) metals at room temperature, we designed and prepared the micro multilayer hierarchical structure (MHS) of metal materials using low-temperature rolling and surface mechanical attrition treatment (SMAT) processes, which improved the mechanical properties and work hardening ability of UFG Ti. The microstructure observation and mechanical properties testing, combined with fracture surface analysis, show that the multilayer gradient microstructure can improve the work hardening ability of ultrafine-grained metal, achieving a more moderate stress distribution and an improved resistance of the workpiece to failure cracks. A fracture mechanics model is proposed to explain the crack arrest effect of the MHS.
- ultrafine-grained materials /
- Ti /
- toughening /
- multilayered structure /
- gradient structure

HTML全文

图 1 多层梯度超细晶粒钛试样横截面的扫描电镜图像

Figure 1. SEM image of the lateral surface of MHS Ti specimen

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图 2 表面以下20 μm处的微观结构透射电镜亮场图像

Figure 2. TEM bright-field (BF) image of the microstructures 20 μm below the top surface

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图 3 表面以下60 μm处微观结构透射电镜亮场图像

Figure 3. TEM BF image of the microstructure 60 μm below the top surface

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图 4 超细晶粒核的透射电镜亮场图像

Figure 4. TEM BF image of the UFG core

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图 5 最大载荷为20 mN时，多层梯度钛横截面上的平均纳米压痕硬度和压痕模量

Figure 5. Average indentation hardness and modulus on across the cross-section of MHS Ti with a maximum load of 20 mN

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图 6 多层梯度超细晶粒钛和均匀超细晶粒钛的工程应力-应变曲线

Figure 6. Engineering stress–strain curves of MHS Ti and uniform UFG Ti

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图 7 （a）为抛光侧面的扫描电镜形貌，（b）为红框区域的高倍SEM图像

Figure 7. SEM image of the polished side (a), and high-magnification SEM image of the red box area (b)

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图 8 失效裂纹在整个超细晶粒芯中扩展的光学显微镜观察

Figure 8. Optical microscope image of a fatigue crack propagation across the entire UFG core

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图 9 多层梯度钛层测量的残余应力-深度剖面

Figure 9. The residual stress–depth profile measured through the layers of MHS Ti

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图 10 用于计算止裂应力强度因子的叠加应力场示意

Figure 10. Schematic illustration of the superimposed stress field used to calculate the stress intensity factor of the arrested crack

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