协同Orowan绕过和攀移机制的镍基高温合金蠕变新模型
A novel creep model with synergetic Orowan bypassing and climbing mechanisms in nickel-base superalloys
李昉 1袁丁玲 2陈康华 3陈送义 2李理4
作者信息
- 1. 中南大学粉末冶金国家重点实验室,长沙 410083
- 2. 中南大学轻合金研究院,长沙 410083
- 3. 中南大学粉末冶金国家重点实验室,长沙 410083;中南大学轻合金研究院,长沙 410083
- 4. 湖南大学机械与车辆工程学院汽车车身先进设计制造国家重点实验室,长沙 410082
- 折叠
摘要
提出一种用于准确便捷预测析出相增强镍基高温合金稳态蠕变速率的蠕变新模型.基于析出相的空间分布,采用概率依赖的方法将位错-析出相交互作用中Orowan绕过和位错攀移机制的协同模式耦合到新的蠕变模型中.结果表明,新模型预测的稳态蠕变速率与实验数据吻合很好.此外,当前模型不再依赖于可调参数;同时,确定了阈值应力与温度的定量关系.这项工作为蠕变变形过程中位错-析出相交互作用提供新思路,并为设计具有更优异蠕变性能的析出强化合金提供有效模型.
Abstract
A novel creep model was proposed to accurately and conveniently predict the steady-state creep rate of precipitation-strengthening nickel-base superalloys.Based on the space distribution of precipitates,the synergetic mode of Orowan bypassing and dislocation climbing mechanisms in dislocation-precipitate interaction was coupled into the new creep model according to probability-correlative method.The results show that the new model can accurately describe the steady-state creep rate compared with the experimental data,which is far better than the classical model.Moreover,the present model no longer relies on the adjustable parameters.The quantitative relationship between threshold stress and temperature is also determined.This work sheds new light on the dislocation-precipitate interaction during creep deformation,and provides an effective model for designing precipitation-strengthening alloys with improved creep properties.
关键词
镍基高温合金/蠕变模型/稳态蠕变速率/阈值应力Key words
nickel-base superalloys/creep model/steady-state creep rate/threshold stress引用本文复制引用
基金项目
National Key Laboratory of Science and Technology for National Defence on High-Strength Lightweight Structural Materials of (20190104)
State Key Laboratory of High-Performance Complex Manufacturing of Central South University,China(ZZYJKT2020-03)
国家重点研发计划(2016YFB0300801)
出版年
2024
NETL
NSTL
维普
万方数据