70Cr3Mo钢动态再结晶临界条件研究
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摘要
采用Gleeble-1500D热模拟实验机对70Cr3Mo钢进行热模拟压缩实验,变形温度为850~1150℃,应变速率为0.01~10 s-1,用加工硬化率的方法处理实验数据,再结合lnθ-ε曲线的拐点及-(lnθ)/ε-ε曲线最小值判据,建立70Cr3Mo钢热变形过程中的动态再结晶临界应变模型。研究结果表明:实验条件下,70Cr3Mo钢的lnθ-ε曲线均具有拐点特征,对应的-(lnθ)/ε-ε曲线均出现最小值,该最小值所对应的应变即为临界应变;临界应变随变形温度的降低和应变速率的增加而增大;临界应变预测模型可表示为εc=5.4446×10-2Z0.01878。
The hot simulation compression tests of steel 70Cr3 Mo were conducted under conditions of deformation temperature 850-1150 ℃ and strain rate 0. 01-10 s-1by the Gleeble-1500 D thermo-simulation test machine. The critical strain model of dynamic recrystallization for steel 70Cr3 Mo during hot deformation was established by using the work hardening rate method to analyze experimental data,combined with the inflection point criterion of ln θ-ε curves and the minimum value criterion of-( ln θ) / ε-ε curves. The results show that the ln θ-ε curves of steel 70Cr3 Mo have the characteristics of inflection point and the corresponding-( ln θ) / ε-εcurve have the minimum value. Therefore,the critical state of this alloy is attained,which means the critical strain. The critical strain increases with the decrease of temperature and the increase of strain rate. The predicting model of critical strain can be described by the function of εc= 5. 4446 × 10-2Z0. 01878.
The hot simulation compression tests of steel 70Cr3 Mo were conducted under conditions of deformation temperature 850-1150 ℃ and strain rate 0. 01-10 s-1by the Gleeble-1500 D thermo-simulation test machine. The critical strain model of dynamic recrystallization for steel 70Cr3 Mo during hot deformation was established by using the work hardening rate method to analyze experimental data,combined with the inflection point criterion of ln θ-ε curves and the minimum value criterion of-( ln θ) / ε-ε curves. The results show that the ln θ-ε curves of steel 70Cr3 Mo have the characteristics of inflection point and the corresponding-( ln θ) / ε-εcurve have the minimum value. Therefore,the critical state of this alloy is attained,which means the critical strain. The critical strain increases with the decrease of temperature and the increase of strain rate. The predicting model of critical strain can be described by the function of εc= 5. 4446 × 10-2Z0. 01878.
引文
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[4]赵艳君,胡治流,李逸泰,等.20Si Mn3Ni A钢动态再结晶的临界条件[J].金属热处理,2012,37(3):20-23.Zhao Y J,Hu Z L,Li Y T,et al.Dynamic recrystallization critical condition of 20Si Mn3Ni A steel[J].Heat Treatment of Metals,2012,37(3):20-23.
[5]夏玉峰,赵磊,余春堂,等.42Cr Mo钢动态再结晶的临界条件[J].材料热处理学报,2013,34(4):74-79.Xia Y F,Zhao L,Yu C T,et al.Dynamic recrystallization critical conditions of 42Cr Mo steel[J].Transactions of Materials and Heat Treatment,2013,34(4):74-79.
[6]陈拂晓,郭云汉,郭俊卿,等.AZ31B镁合金热压缩力学行为与本构方程建立[J].锻压技术,2011,36(5):144-147.Chen F X,Guo Y H,Guo J Q,et al.Mechanics behavior and constitutive equation of AZ31B magnesium alloy at hot compression[J].Forging&Stamping Technology,2011,36(5):144-147.
[7]Wu H Y,Wu C T,Yang J C,et al.Hot workability analysis of AZ61 Mg alloys with processing maps[J].Materials Science and Engineering A,2014,607:261-268.
[8]Quan G Z,Shi Y,Wang Y X,et al.Constitutive modeling for the dynamic recrystallization evolution of AZ80 magnesium alloy based on stress-strain data[J].Materials Science and Engineering A,2011,528(28):8051-8059.
[9]Poliak E I,Jonas J J.A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization[J].Acta Materialia,1996,44(1):127-136.
[10]欧阳德来,鲁世强,黄旭,等.TA15钛合金β区变形动态再结晶的临界条件[J].中国有色金属学报,2010,20(8):1539-1544.Ouyang D L,Lu S Q,Huang X,et al.Critical conditions of dynamic recrystallization during deformation ofβarea in TA15 titanium alloy[J].The Chinese Journal of Nonferrous Metals,2010,20(8):1539-1544.
[11]李增德,林晨光,崔舜.V-5Cr-5Ti合金的热变形行为及加工图[J].稀有金属,2015,39(3):207-213.Li Z D,Lin C G,Cui S.Hot deformation behavior and processing map of V-5Cr-5Ti alloy[J].Chinese Journal of Rare Metals,2015,39(3):207-213.
[12]孙朝阳,栾京东,刘赓,等.AZ31镁合金热变形流动应力预测模型[J].金属学报,2012,48(7):853-860.Sun C Y,Luan J D,Liu G,et al.Predicted constitutive modeling of hot deformation for AZ31 magnesium alloy[J].Acta Metallurgica Sinica,2012,48(7):853-860.
[13]王庆娟,刘锋,杜忠泽,等.Cu-Cr-Zr合金的热变形行为[J].稀有金属,2013,37(5):687-694.Wang Q J,Liu F,Du Z Z,et al.Hot compression deformation behavior of Cu-Cr-Zr alloy[J].Chinese Journal of Rare Metals,2013,37(5):687-694.
[14]Sellars C M,Whiteman J A.Recrystallization and grain growth in hot rolling[J].Metal Science,1979,13(3):187-194.