BT25钛合金动态再结晶行为的元胞自动机模拟

doi:10.3901/JME.2020.20.066

机械工程学报 ›› 2020, Vol. 56 ›› Issue (20): 66-73.doi: 10.3901/JME.2020.20.066

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BT25钛合金动态再结晶行为的元胞自动机模拟

冯瑞¹, 王克鲁¹, 鲁世强¹, 李鑫¹, 欧阳德来², 周璇¹, 钟明君¹

1. 南昌航空大学航空制造工程学院南昌 330063;
2. 南昌航空大学材料科学与工程学院南昌 330063

收稿日期:2019-12-26 修回日期:2020-05-10 出版日期:2020-10-20 发布日期:2020-12-18
作者简介:冯瑞,男,1993年出生。主要研究方向为钛合金塑性成形。E-mail:13576076918@163.com;王克鲁(通信作者),男,1968年出生,博士,教授,博士研究生导师。主要研究方向为金属材料组织与热加工工艺。E-mail:wangkelu@126.com
基金资助:
国家自然科学基金(51761029,51864035)和江西省研究生创新专项资金(YC2019-S337)资助项目。

Cellular Automaton Simulation of Dynamic Recrystallization Behavior in BT25 Titanium Alloy

FENG Rui¹, WANG Kelu¹, LU Shiqiang¹, LI Xin¹, OUYANG Delai², ZHOU Xuan¹, ZHONG Mingjun¹

1. School of Aerospace Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063;
2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063

Received:2019-12-26 Revised:2020-05-10 Online:2020-10-20 Published:2020-12-18

摘要/Abstract

摘要： 为研究热加工工艺参数对钛合金塑性成形过程中微观组织的影响,利用Gleeble-3500型热模拟试验机对BT25钛合金进行单道次等温恒应变压缩试验。分析真应力-应变曲线,建立JMAK动态再结晶动力学方程;通过对热变形行为的分析,推导出钛合金的位错密度模型、再结晶形核和晶粒长大模型;结合元胞自动机的算法,建立元胞自动机(Cellular automata, CA)模型并利用该模型模拟和验证了BT25钛合金热变形过程中动态再结晶行为。结果表明,BT25钛合金的流动应力对应变速率和变形温度非常敏感;提高变形温度或降低应变速率均有利于材料发生动态再结晶;CA模型模拟晶粒尺寸误差约为3%,预测DRX体积分数误差在10%以内。该模型具有良好的预测精度,为合金材料在塑性加工过程中优化工艺参数和控制锻件微观组织演变提供了可靠性依据。

关键词: BT25钛合金, 热变形, 动态再结晶, 元胞自动机, 数值模拟

Abstract: In order to study the effect of thermal processing parameters on microstructure of titanium alloy during plastic forming, the single-pass isothermal constant strain compression test of BT25 titanium alloy is carried out by Gleeble-3500 thermal simulation machine. The true stress-strain curves are analyzed and the dynamic equation of JMAK recrystallization is established. Based on analysis of thermal deformation behavior, dislocation density model, recrystallization nucleation model and grain growth model are derived. A cellular automata (CA) model is established through the algorithm to simulate and verify the dynamic recrystallization(DRX) behavior of BT25 titanium alloy during thermal deformation. The results show that the flow stress of BT25 titanium alloy is very sensitive to the strain rate and deformation temperature. Increasing deformation temperature or decreasing strain rate is beneficial to dynamic recrystallization of materials. The CA model simulated the grain size about the error is 3%, and predicted the DRX volume fraction about error within 10%. This model has good prediction accuracy. A reliable basis is provided for optimizing technological parameters and controlling microstructure evolution of forging in the process of plastic machining.

Key words: BT25 titanium alloy, thermal deformation, dynamic recrystallization, cellular automata, numerical simulation

中图分类号:

TG146

冯瑞, 王克鲁, 鲁世强, 李鑫, 欧阳德来, 周璇, 钟明君. BT25钛合金动态再结晶行为的元胞自动机模拟[J]. 机械工程学报, 2020, 56(20): 66-73.

FENG Rui, WANG Kelu, LU Shiqiang, LI Xin, OUYANG Delai, ZHOU Xuan, ZHONG Mingjun. Cellular Automaton Simulation of Dynamic Recrystallization Behavior in BT25 Titanium Alloy[J]. Journal of Mechanical Engineering, 2020, 56(20): 66-73.

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BT25钛合金动态再结晶行为的元胞自动机模拟

Cellular Automaton Simulation of Dynamic Recrystallization Behavior in BT25 Titanium Alloy

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