李会明,张菁丽,毛小南,洪 权,张永强,潘 浩,蔡建华.Ti600合金在 (α+β) 相区热变形行为和本构模型研究[J].稀有金属材料与工程,0,():-.[Li Huiming,Zhang Jingli,Mao Xiaonan,Hong Quan,Zhang Yongqiang,Pan Hao,Cai Jianhua.Hot Deformation Behavior and Constitutive Models of Ti600 Alloy in (α+β) Phase Region[J].Rare Metal Materials and Engineering,0,():-].
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Ti600合金在 (α+β) 相区热变形行为和本构模型研究
投稿时间:2020-06-04  修订日期:2020-06-16
中文关键词:  Ti600合金  热压缩  变形行为  软化行为  本构模型
基金项目:National Natural Science Foundation of China (51805442)
中文摘要:
      对具有片层状初始组织的Ti600合金的热变形行为进行了系统的研究。变形温度范围为800-960 ℃,应变速率范围为10-3-1 s-1。随后提出了应变硬化指数(n)来表征流动软化和加工硬化之间的竞争。并且通过分析流变曲线和观察显微组织研究了该合金的软化行为。结果表明,变形参数对Ti600合金的流变行为有显著影响。当变形超过峰值应变之后,n值逐渐降低,动态软化过程开始占主导地位。微观组织分析表明:热变形过程中,α相的弯曲、破碎、动态回复和动态再结晶行为是造成Ti600合金软化的主要原因。最后基于实验数据,建立了三种本构模型,分别是应变补偿Arrhenius模型、Hensel-Spittel模型和修正的Arrhenius模型,来表征Ti600合金的流变行为。将三种模型预测的流变应力与实验结果进行比较,并计算其相关系数值和平均相对误差值来评估模型的准确性。三种模型的相关系数值分别为0.965、0.989和0.997,平均相对误差值分别为12.86%,9.74%和3.26%。这些结果表明,这三种模型都可以描述Ti600合金的流变行为,而修正的Arrhenius模型具有最高的预测精度。
Hot Deformation Behavior and Constitutive Models of Ti600 Alloy in (α+β) Phase Region
英文关键词:Ti600 alloy  hot compression  deformation behavior  softening behavior  constitutive models
英文摘要:
      The high-temperature deformation behavior of Ti600 alloy with a lamellar initial microstructure has been investigated in the temperature range of 800-960 ℃ and the strain rate range of 10-3-1 s-1. Subsequently, the strain hardening exponent (n) has been proposed to characterize the competition of flow softening and work hardening. The softening behavior of this alloy has also been studied according to flow curve analysis and microstructure observation. The results indicate that deformation parameters have the significant influences on the flow behavior of Ti600 alloy. The n-value gradually decreases after the peak strain, which indicates that the dynamic softening begins to take dominant. The dynamic softening behavior of Ti600 alloy mainly attributes to the bending, fragmentation, dynamic recovery and recrystallization of α phase during the high-temperature deformation according to the microstructure characterization. Based on experimental data, original strain-compensated Arrhenius, Hensel-Spittel and modified Arrhenius constitutive models have been established to describe the deformation behavior of Ti600 alloy. The flow stresses predicted by three models are compared with experimental results, and the calculated correlation coefficients are 0.965, 0.989, and 0.997. Also, the values of average absolute relative error are 12.86 %, 9.74 %, and 3.26 %. These results suggest that three models can descript the flow behavior of Ti600 alloy, while the modified Arrhenius model exhibits the highest prediction accuracy.
作者单位
李会明 东北大学 
张菁丽 西北有色金属研究院 
毛小南 西北有色金属研究院 
洪 权 西北有色金属研究院 
张永强 西北有色金属研究院 
潘 浩 西北有色金属研究院 
蔡建华 西北有色金属研究院 
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