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%。
The dynamic observation of dynamic recrystallization（DRX） microstructure evolution of Ni-based high temperature alloy Haynes230 under hot compression at various strain rates and temperatures was realized by means of the cellular automata（CA） simulation by the programming based on Matlab software. Dislocation density and RDX volume fraction were obtained as well as the macro-level variation of the flow stress-strain the micro-level evolution of the microstructure. The results show that the DRX volume fraction increases and the flow stress decreases with the increase of the temperature and the decrease of the strain ratio. Therefore, the reasonable high temperature and low strain ratio are beneficial to the occurrence of DRX and the plastic forming of the difficult-to-deform metal. The DRX volume fraction of Haynes230 alloy increases with the increase of strain, and the increase of the DRX volume fraction follows the law of slow-shape-slow. The simulation results conform well to the experiment ones, and the maximum error is 14.6%.
作者
朱宁远
夏琴香
程秀全
ZHU Ningyuan XIA Qinxiang CHENG Xiuquan(School of Mechanical and Automobile Engineering, South China University of Technology, Guangzhou 510640, China Department of Aircraft Maintenance Engineering, Guangzhou Civil Aviation College, Guangzhou 510403, China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第9期2316-2323,共8页
Journal of Central South University:Science and Technology
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)~~
