BT20钛合金热变形流变应力的预测模型
Predictive Models for Flow Stress of BT20 Titanium Alloy
摘 要
对现有的流变应力模型进行了分析,针对BT20钛合金流变应力的特性,提出了一个新的计算热变形条件下钛合金流变应力的模型.该模型考虑了温度和应变速率的影响,能描述热变形过程中加工硬化阶段和加工软化阶段的流变应力;并建立了峰值应变、峰值应力、稳态应力和变形参量之间关系的模型.结果表明:这些模型预测结果与试验结果吻合,具有较好的精度.
流变应力
应变速率
变形温度
titanium alloy
flow stress
strain rate
deformation temperature
Abstract
The existing flow stress models were analyzed.Aiming at the characteristics of flow stress of BT20 titanium alloy,a mathematical model has been put forward to determine flow stress under hot working condition.The propounded model can describe the flow stresses involved in the work hardening and work softening processes due to dynamic recrystallization and recovery,as well as the effect of temperature and strain rate.The models between peak strain,peak stress,steady state stress and deformation parameters have been also established,respectively.The preciseness of calculated results using these models is good to compare with the experimental results.
中图分类号 TG111.7
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收稿日期 2006/10/9
修改稿日期 2006/12/10
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备注李雄(1969-),男,工程师,博士.
引用该论文: LI Xiong,PANG Ke-chang,JI Bo,WANG Hong-bin. Predictive Models for Flow Stress of BT20 Titanium Alloy[J]. Materials for mechancial engineering, 2007, 31(7): 54～56
李雄,庞克昌,计波,汪宏斌. BT20钛合金热变形流变应力的预测模型[J]. 机械工程材料, 2007, 31(7): 54～56
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参考文献
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【2】Ludwik P.Elemente der techanologishen mechanik[M].Berlin:Springer-Verlag OHG,1909.
【3】Hollomon J H.Tensile deformation[J].Trans AIME,1945,162:268-290.
【4】Ludwikson D C.Modified Stress-strain relation for Fcc metals and alloys[J].Metall Trans,1971,10:2825-2828.
【5】Mecking H.Strength of Metals and Alloys[C]//Proc.5th Int.Conf.on the Strength of Metals ana Alloys.Oxford:Pergamon Press,1980.
【6】Voce E.The Relationship between stress and strain for homogeneous deformation[J].J Inst Metals,1948,74:537-562.
【7】Wahabi M E,Cabrera J M,Prado J M.Hot working of two AISI 304 steels:a comparative study[J].Materials Science and Engineering,2003,A343:116-125.
【8】Sellars C M,Whiteman J A.Recrystallization and grain growth in hot rolling[J].Met Sci,1979,13:187-194.
【9】Sellars C M.Proceedings of The Hot Working and Forming Processes[M].London:Metals Society,1980.
【10】Mcqueen H J,Ryan N D.Constitutive analysis in hot working[J].Materials Science and Engineering,2002,A322:43-63.
【11】Xu W C,Shan D B,Lu Y,et al.Research on the characteristics of hot deformation in BT20 titanium alloy and its optimum spinning temperature range[J].J Mater Sci Technol,2005,6:807-812.
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