基于Zener-Hollomon参数的MoLa合金本构研究
|
摘要
采用Geeble1500型热模拟试验机对MoLa合金进行等温恒应变速率压缩实验,研究在温度800~1 150℃、应变速率0.001~10 s~(-1)范围内的流变曲线特点及本构方程。结果表明,MoLa合金的流变应力随温度的升高和应变速率的降低而减小,变形机制主要以动态回复软化为主,在应变速率为0.001 s~(-1)时,1 000~1 150℃变形温度下软化现象最为显著,其流变应力随应变的增加而降低;采用双曲正弦函数建立Mo La合金本构方程,其变形激活能为342.68 k J/mol,经过误差分析得出所建立的本构方程的相关系数和相对误差分别为0.9441和7.13%,能够较好地预测该合金的热变形行为。
To investigate the flow stress characteristics and deformation mechanism of Mo La alloy,the isothermal compression tests were performed over the ranges of temperature 800~1 150 oC and the strain rate range of 0.001~10 s~(-1) on a Gleeble-1500 simulator. Test results show that the flow stress decreases with either the increase of temperature or the decrease of strain rate. The deformation mechanism mainly is dynamic recovery.At the temperature 800~1 150 oC and the strain rate 0.001 s~(-1),softening phenomenon is the most significant,and the flow stress decreased with the increase of strain. A hyperbolic sine model has been established to describe the changing rule of flow stress with the strain rate and deformation temperature,and the activation energy of the Mo La alloy is Q =342.68 k J/mol. The correlation coefficient and average relative error of the network have been calculated to be 0.9441 and 7.13% respectively. So it is suitable for predicting the thermal deformation behavior of the Mo La alloy.
To investigate the flow stress characteristics and deformation mechanism of Mo La alloy,the isothermal compression tests were performed over the ranges of temperature 800~1 150 oC and the strain rate range of 0.001~10 s~(-1) on a Gleeble-1500 simulator. Test results show that the flow stress decreases with either the increase of temperature or the decrease of strain rate. The deformation mechanism mainly is dynamic recovery.At the temperature 800~1 150 oC and the strain rate 0.001 s~(-1),softening phenomenon is the most significant,and the flow stress decreased with the increase of strain. A hyperbolic sine model has been established to describe the changing rule of flow stress with the strain rate and deformation temperature,and the activation energy of the Mo La alloy is Q =342.68 k J/mol. The correlation coefficient and average relative error of the network have been calculated to be 0.9441 and 7.13% respectively. So it is suitable for predicting the thermal deformation behavior of the Mo La alloy.
引文
[1]TANAKA R.Microstructure and strengthening mechanisms of Mo alloy[J].Materials at High Temperatures,2000,17(4):457-460.
[2]PENG Z H.Rare metal materials process technology[M].Changsha:Central South University Press,2003:135-136.
[3]王艳,王国栋,武宇,等钼镧合金中稀土相的研究[J].稀有金属,2007(s1):50-53.
[4]周美玲,李俊,左铁镛镧钼丝组织结构和性能研究[J].中国有色金属学报,1994,3(2):45-50.
[5]李淑霞,魏光明.钼镧合金丝的组织与性能[J].稀有金属材料与工程,1999,28(3):186-188.
[6]王芳,李维娟.SS400钢低温区流变应力的预测[J].辽宁科技大学学报,2004,27(4):248-251.
[7]SELLARS C M,MCTEGART W J.Tegart.On the mechanism of hot deformation[J].Acta Metallurglca,1966,14(9):1136-1138.
[8]田录,吉海宾,雷家峰,等.Ti6242s合金本构关系的研究[J].热加工工艺,2013,42(20):92-102.
[9]罗锐,程晓农,徐桂芳,等.一种铁镍铬合金的热变形行为及其本构模型的修正[J].功能材料,2016,I(47):89-94.
[10]KREUSS G.Deformation Processing and Structure[M].Ohio:American Sosiety for Metal,1984:125-156.
[11]胡美娟,王鹏,李金凤.20Cr Mo合金钢热压研究[J].热加工工艺,2011,40(10):49-51.
[12]ZENER C,HOLLOMON J H.Effect of strain rate upon the plastic flow of steel[J].Journal of Applied Physics,1994,15:22-27.
[2]PENG Z H.Rare metal materials process technology[M].Changsha:Central South University Press,2003:135-136.
[3]王艳,王国栋,武宇,等钼镧合金中稀土相的研究[J].稀有金属,2007(s1):50-53.
[4]周美玲,李俊,左铁镛镧钼丝组织结构和性能研究[J].中国有色金属学报,1994,3(2):45-50.
[5]李淑霞,魏光明.钼镧合金丝的组织与性能[J].稀有金属材料与工程,1999,28(3):186-188.
[6]王芳,李维娟.SS400钢低温区流变应力的预测[J].辽宁科技大学学报,2004,27(4):248-251.
[7]SELLARS C M,MCTEGART W J.Tegart.On the mechanism of hot deformation[J].Acta Metallurglca,1966,14(9):1136-1138.
[8]田录,吉海宾,雷家峰,等.Ti6242s合金本构关系的研究[J].热加工工艺,2013,42(20):92-102.
[9]罗锐,程晓农,徐桂芳,等.一种铁镍铬合金的热变形行为及其本构模型的修正[J].功能材料,2016,I(47):89-94.
[10]KREUSS G.Deformation Processing and Structure[M].Ohio:American Sosiety for Metal,1984:125-156.
[11]胡美娟,王鹏,李金凤.20Cr Mo合金钢热压研究[J].热加工工艺,2011,40(10):49-51.
[12]ZENER C,HOLLOMON J H.Effect of strain rate upon the plastic flow of steel[J].Journal of Applied Physics,1994,15:22-27.