第三型应变时效的提出与研究进展

王建军; 袁康博; 张晓琼; 王瑞丰; 高猛; 郭伟国

doi:10.11883/bzycj-2020-0422

第三型应变时效的提出与研究进展

doi: 10.11883/bzycj-2020-0422

1.
太原理工大学机械与运载工程学院，山西太原 030024
2.
西北工业大学航空学院，陕西西安 710072

基金项目: 国家自然科学基金（11902272；11872051）；陕西省自然科学基金（2019JQ-129）

详细信息

作者简介:
王建军（1987－　），男，博士，副研究员，wangjianjun@tyut.edu.cn

通讯作者:
郭伟国（1960－　），男，博士，教授，weiguo@nwpu.edu.cn

中图分类号: O347.3
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- 被引次数: 0
出版历程
- 收稿日期: 2020-11-24
- 修回日期: 2021-01-19
- 网络出版日期: 2021-04-23
- 刊出日期: 2021-05-05

Proposition and research progress of the third-type strain aging

1.
College of Mechanical and Vehicle Engineering, Taiyuan Universtiy of Technology, Taiyuan 030024, Shanxi, China
2.
School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China

摘要

摘要: 第三型应变时效现象的发现使得传统的对于金属塑性流动行为的认识、位错的热激活理论以及常见的金属热粘塑性本构模型均需要进一步完善。为了系统地认识第三型应变时效，首先介绍了第三型应变时效现象区别于静态应变时效和Portevin-Le Chatelie动态应变时效的宏观特征，其次，对第三型应变时效的微观机理以及第三型应变时效与Portevin-Le Chatelier动态应变时效、蓝脆现象以及机械波谱的关联性进行了系统总结。最后，介绍了包含第三型应变时效的金属热黏塑性本构模型的发展。
- 应变时效 /
- 温度 /
- 应变率 /
- 微观机理 /
- 本构模型
Abstract: The traditional knowledge of plastic flow behavior of metal, dislocation activation theory, and thermoviscoplastic constitutive model of metal needs a further perfection due to the occurrence of third-type strain aging. Third-type strain aging leads to a bell-shaped flow stress-temperature curve, that is, the flow stress first increases as temperature increases, and after a peak value is reached, it decreases with further increase of temperature. Third-type strain aging occurs at both low and high strain rates. The bell-shaped segment induced by third-type strain aging on the flow stress-temperature curve shifts to higher temperature region as strain rate increases. In order to develop a systematic understanding of the third-type strain aging, firstly, macro characteristics of third-type stain aging effect that was distinguished from static strain aging effect and Portevin-Le Chatelier dynamic strain aging effect were introduced. Then, the micro mechanism of third-type strain aging and correlation of third-type strain aging, Portevin-Le Chatelier dynamic strain aging, blue brittleness phenomenon, and internal friction were systematically concluded. Third-type strain aging, Portevin-Le Chatelier dynamic strain aging, blue brittleness phenomenon, and mechanical spectroscopy are all resulted from the interaction of mobile dislocations with diffusion atoms. Third-type strain aging, Portevin-Le Chatelier dynamic strain aging, and blue brittleness phenomenon are different manifestations of dynamic strain aging. Third-type strain aging can be considered as another mode of mechanical spectroscopy. The common constitutive models are able to capture the plastic behavior of many metals under the coupling influence of strain rate and temperature in some cases. However, these thermoviscoplastic constitutive models do not take the effect of third-type strain aging into consideration, and they cannot describe the thermoviscoplastic behavior including the third-type strain aging effect. To accurately describe the plastic behavior of metals, some constitutive models including the effect of third type strain aging were proposed. The development of the thermoviscoplastic constitutive model of metal considering the effect of third type strain aging was finally introduced.
- strain aging /
- temperature /
- strain rate /
- microscopic mechanism /
- constitutive model

HTML全文

图 1 三种应变时效的表现形式

Figure 1. Manifestation of the three kinds of strain aging

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图 2 不同应变率下流动应力随温度变化曲线

Figure 2. Variation of flow stress with temperature at different strain rates

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图 3 扩散的溶质原子对运动位错的钉扎引起的第三型应变时效的示意图

Figure 3. Schematic of third-type strain aging caused by dislocation pinning by diffused solute atom

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图 4 API X70管线钢塑性流动行为中出现的第三型应变时效现象及本构模型预测结果^[88]

Figure 4. Third type strain aging phenomenon in the plastic flow behavior of API X70 pipeline steel and prediction results of constitutive model^[88]

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图 5 本构模型预测得到的Q235B钢在应变为0.1下的流动应力随温度和应变率变化的情况^[6]

Figure 5. Constitutive model predicted variation of flow stress at the strain of 0.1 with temperature and strain rate for Q235B steel^[6]

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图 6 通过机器学习得到的DP800钢的流动应力随温度和等效应变率变化的情况^[18]

Figure 6. Variation of flow stress with temperature and strain rate obtained with machine learning for DP 800 steel^[18]

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