Hu Linli, Zhou Shaoshuai, Yuan Xunyu, Xu Xiwen, Yang Ruizhi, Shu Xiaoyong
School of Mechanical Engineering, Jiangxi Vocational College of Mechanical and Electrical Technology, Nanchang 330013, China.
Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang Hangkong University, Nanchang 330063, China.
Materials (Basel). 2024 Nov 25;17(23):5752. doi: 10.3390/ma17235752.
The Gleeble-1500 hot simulation experimental equipment was used to investigate the effects of hot simulation compression on PH13-8Mo stainless steel with strain rates ranging from 0.1 to 10 s and deformation temperatures ranging from 900 to 1150 °C. The stress-strain charts for each deformation condition clearly show the characteristics of dynamic recrystallization behavior. The rheological stress rises as the deformation temperature falls and the strain rate rises. A coupled Laasraoui-Jonas (L-J) model was developed based on the discovery that the dislocation density is crucial to the nucleation and micro-structure evolution of dynamic recrystallization during thermal deformation. The findings demonstrate that the model accurately captures the combined action of dynamic reversion and recrystallization inside the material during hot compression of PH13-8Mo stainless steel and that as deformation rises, the dislocation density first increases and subsequently drops. For calculations and numerical simulations of the evolution of the micro-structure under hot compression, the created model was integrated into the DEFORM-3D finite element simulation program. The projected micro-structure evolution of the PH13-8Mo stainless steel under various deformation circumstances is compared to the measured grain distribution, grain size, and the degree of dynamic recrystallization in the metallographic pictures. The fact that the simulated result plots resemble the metallographic charts so closely demonstrates that the L-J dislocation density model can reliably forecast how dynamic recrystallization of PH13-8Mo stainless steel would behave under hot compression.
采用Gleeble-1500热模拟实验设备，研究了应变速率为0.1至10 s以及变形温度为900至1150 °C的热模拟压缩对PH13-8Mo不锈钢的影响。每个变形条件下的应力-应变图清楚地显示了动态再结晶行为的特征。流变应力随着变形温度的降低和应变速率的升高而增加。基于位错密度对热变形过程中动态再结晶的形核和微观结构演变至关重要这一发现，开发了一种耦合的Laasraoui-Jonas（L-J）模型。研究结果表明，该模型准确地捕捉了PH13-8Mo不锈钢热压缩过程中材料内部动态回复和再结晶的联合作用，并且随着变形量的增加，位错密度先增加后降低。为了对热压缩下微观结构的演变进行计算和数值模拟，将创建的模型集成到DEFORM-3D有限元模拟程序中。将预测的不同变形条件下PH13-8Mo不锈钢的微观结构演变与金相图片中测量的晶粒分布、晶粒尺寸和动态再结晶程度进行了比较。模拟结果图与金相图非常相似，这一事实表明L-J位错密度模型能够可靠地预测PH13-8Mo不锈钢在热压缩下的动态再结晶行为。
