基于元胞自动机的Haynes230动态再结晶组织演变

发布时间：2018-04-21 10:30

本文选题：元胞自动机 + 动态再结晶　；参考：《中南大学学报(自然科学版)》2017年09期

【摘要】：采用元胞自动机(CA),通过Matlab编程实现不同温度、不同应变速率下Haynes230镍基高温合金动态再结晶微观组织演变的动态观测,获得微观组织、位错密度、动态再结晶体积分数等微观层次的演变规律及宏观层次的流变应力-应变变化规律。研究结果表明:随着温度的升高和应变速率减小,动态再结晶分数增加、流变应力减小,因此,较高温度及较小的应变速率有利于Haynes230难变形金属热成形中动态再结晶的发生。Haynes230合金动态再结晶分数随着应变的增加而增大,其增长经历缓慢-快速-缓慢3个过程。CA模拟获得的再结晶分数与已有试验规律一致,最大相对误差为14.6%。
[Abstract]:The dynamic observation of dynamic recrystallization microstructure evolution of Haynes230 nickel-based superalloy at different temperatures and strain rates was realized by using cellular automata and Matlab programming. The microstructure and dislocation density were obtained. The evolution law of dynamic recrystallization volume integral number at microcosmic level and rheological stress-strain variation law at macroscopic level. The results show that with the increase of temperature and the decrease of strain rate, the dynamic recrystallization fraction increases and the flow stress decreases. Higher temperature and lower strain rate are beneficial to the dynamic recrystallization of Haynes230 hard deformation metal hot forming. The dynamic recrystallization fraction of Haynes230 alloy increases with the increase of strain. The recrystallization fraction obtained by CA simulation is consistent with the experimental results, and the maximum relative error is 14.6.
【作者单位】：华南理工大学机械与汽车工程学院;广州民航职业技术学院机务工程系;
【基金】：国家自然科学基金资助项目(51375172) 高等学校博士学科点专项科研基金资助项目(20130172110024)~~
【分类号】：TG132.3

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