Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第8期    总第137期    2010年8月

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文章编号:1004-0609(2010)08-1539-06
TA15钛合金β区变形动态再结晶的临界条件
欧阳德来1, 2,鲁世强1,黄  旭3,雷力明3

(1. 南昌航空大学 材料科学与工程学院,南昌 330063;
2. 南京航空航天大学 材料科学与技术学院,南京 210016;
3. 北京航空材料研究院 钛合金研究室,北京100095
)

摘 要: 采用Thermecmaster-Z热模拟试验机在变形温度1 050~1 100 ℃,应变速率10−3~1 s−1的条件下进行热模拟压缩试验。采用加工硬化率处理方法对应力-应变数据进行处理,结合ln θ —ε曲线的拐点及−∂(ln θ)/∂ε —ε曲线最小值的判据,研究TA15钛合金β区变形时的动态再结晶临界条件。结果表明:在本实验条件下,TA15钛合金的ln θ —ε曲线均出现拐点及−∂(ln θ)/∂ε —ε曲线均出现最小值;临界应变随应变速率的增大及变形温度的降低而增加,且临界应变与峰值应变之间基本保持恒定值εcp=0.62;临界应变预测模型函数关系可以表示为εc=  0.92×10−2Z 0.0843

 

关键字: 加工硬化率;动态再结晶;临界条件;TA15钛合金

Critical conditions of dynamic recrystallization
during deformation of β area in TA15 titanium alloy
OUYANG De-lai1, 2, LU Shi-qiang1, HUANG Xu3, LEI Li-ming3

1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;
2. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
3. Titanium Alloys Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:The hot simulation compression tests of titanium alloy TA15 were conducted at deformation temperature of   1 050−1 100 ℃ and strain rate of 10−3−1 s−1 with the Thermecmaster-Z hot simulation test machine. The critical conditions of dynamic recrystallization for onset of DRX during deformation of β area were obtained by computation of the work hardening rate θ from initial stress—stain data and introduction of the inflection point criterion of lnθ —ε curves and the minimum value criterion of −∂(lnθ)/∂ε —ε curves. The results indicate that an inflection point in the ln θ —ε curve appears and a minimum value of −∂(lnθ)/∂ε —ε curve is presented when the critical state is attained for this alloy. The critical strain increases with increasing the strain rate and decreasing the deformation temperature. There is linear relationship between critical strain and peak strain, i.e. εcp=0.65. The predicting model of critical strain is described by the function of εc=0.92×10−2Z0.0843.

 

Key words: work hardening rate; dynamic recrystallization; critical condition; TA15 titanium alloy

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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