第8期 文智等：稀土对T91耐热钢动态再结晶行为影响 ·1005· 50m 50μm d 50 um 50m 图71#和2#试样在不同变形条件下的光学显微照片.(a)1#,1000℃，0.004s-1;(b)2#,1000℃，0.004s-1:(c)1#,1050℃， 0.004s-1:(d)2#,1050℃，0.004s-1 Fig.7 Optical microstructures of samples compressed under different conditions:(a)sample No.1,1000 C,0.004s-1;(b)sample No.2,1000℃，0.004s-1;(c)sample No..1,1050℃，0.004s-1;(d)sample No.2,1050℃，0.004s-1 3结论 study on Johnson Cook,modified Zerilli-Armstrong and (1)在本文的实验条件下，真应力-真应变曲线 Arrhenius-type constitutive models to predict elevated temperature flow behaviour in modified 9Cr-1Mo steel. 特征：变形温度越高和变形速率越低，动态再结晶 Comput Mater Sci,2009,47(2):568 越容易发生. [4 Zhang D Q,Liu G M,Zhao G Q,et al.Cyclic oxi- (2)微量稀土加入T91钢中后，由于稀土的固 dation behavior in water-vapour atmosphere of ferritic- 溶强化及与碳原子的交互作用，变形抗力与峰值应 martensitic steel T91 coated by hot dip aluminizing.J 变均增大，稀土显著抑制再结晶的发生 Cent South Univ Sci Technol,2009,40(4):956 (③)稀土在奥氏体晶界处或晶界附近偏聚，阻 (张都清，刘光明，赵国群，等.T91钢热浸镀铝及其在水蒸 碍晶界的迁移，微量稀土即能阻碍再结晶形核及 汽中的循环氧化行为.中南大学学报：自然科学版，2009， 再结晶晶粒长大，微量稀土加入使再结晶激活能由 40(4:956) 354.6kJ-mol-1提高到397.2 k.J-mol-1. [5]Chen Z X,Xu X C,Wang B,et al.Plastic deformation (4)稀土显著推迟了再结晶发生时间，扩大了 and dynamic recrystallization of T91 steel at high tem- perature.J Univ Sci Technol Beijing,2012,34(3):298 再结晶的时间间隔，推迟了再结晶动力学过程 (陈振湘，徐晓嫦，王斌，等.T91钢的高温塑性变形及动态 再结晶行为.北京科技大学学报，2012,34(3)：298) 参考文献 [6]Wang L M,Ye X N,Jiang L Z,et al.Study on application of RE in a new type of saving Ni austenitic heat-resistant [1]Cerri E,Evangelista E,Spigarelli S,et al.Evolution of steel.J Chin Rare Earths Soc,2010,28(Spec Iss):427 microstructure in a modified 9Cr-1Mo steel during short (任龙妹，叶晓宁，江来珠，等.稀土在新型节镍奥氏体耐热 term creep.Mater Sci Eng A,1998,245(2):285 不锈钢中的应用研究.中国稀土学报，2010,28（专辑）：427) [2]Samantaray D,Mandal S,Bhaduri A K.Characteriza- [7]Chen L,Liu X,Du X J,et al.Effect of rare earths on tion of deformation instability in modified 9Cr-1Mo steel high temperature mechanical properties of austenitic heat- during thermo-mechanical processing.Mater Des,2011, resistant steel.J Chin Rare Earths Soc,2009,27(6):829 32(2):716 (陈雷，刘晓，杜晓建，等.微量稀土对奥氏体耐热钢高温力 [3]Samantaray D,Mandal S,Bhaduri A K.A comparative 学性能的影响.中因稀土学报，2009,27(6)：829)第 8 期 文 智等：稀土对 T91 耐热钢动态再结晶行为影响 1005 ·· 图 7 1#和 2#试样在不同变形条件下的光学显微照片. (a) 1#, 1000 ℃, 0.004 s−1 ; (b) 2#, 1000 ℃, 0.004 s−1 ; (c) 1#, 1050 ℃, 0.004 s−1 ; (d) 2#, 1050 ℃, 0.004 s−1 Fig.7 Optical microstructures of samples compressed under different conditions: (a) sample No.1, 1000 ℃, 0.004 s−1 ; (b) sample No.2, 1000 ℃, 0.004 s−1 ; (c) sample No.1, 1050 ℃, 0.004 s−1 ; (d) sample No.2, 1050 ℃, 0.004 s−1 3 结论 (1) 在本文的实验条件下，真应力–真应变曲线 特征：变形温度越高和变形速率越低，动态再结晶 越容易发生. (2) 微量稀土加入 T91 钢中后，由于稀土的固 溶强化及与碳原子的交互作用，变形抗力与峰值应 变均增大，稀土显著抑制再结晶的发生. (3) 稀土在奥氏体晶界处或晶界附近偏聚，阻 碍晶界的迁移，微量稀土即能阻碍再结晶形核及 再结晶晶粒长大，微量稀土加入使再结晶激活能由 354.6 kJ·mol−1 提高到 397.2 kJ·mol−1 . (4) 稀土显著推迟了再结晶发生时间，扩大了 再结晶的时间间隔，推迟了再结晶动力学过程. 参 考 文 献 [1] Cerri E, Evangelista E, Spigarelli S, et al. Evolution of microstructure in a modified 9Cr-1Mo steel during short term creep. Mater Sci Eng A, 1998, 245(2): 285 [2] Samantaray D, Mandal S, Bhaduri A K. Characteriza￾tion of deformation instability in modified 9Cr-1Mo steel during thermo-mechanical processing. Mater Des, 2011, 32(2):716 [3] Samantaray D, Mandal S, Bhaduri A K. A comparative study on Johnson Cook, modified Zerilli-Armstrong and Arrhenius-type constitutive models to predict elevated temperature flow behaviour in modified 9Cr-1Mo steel. Comput Mater Sci, 2009, 47(2): 568 [4] Zhang D Q, Liu G M, Zhao G Q, et al. Cyclic oxi￾dation behavior in water-vapour atmosphere of ferritic￾martensitic steel T91 coated by hot dip aluminizing. J Cent South Univ Sci Technol, 2009, 40(4): 956 (张都清, 刘光明, 赵国群, 等. T91 钢热浸镀铝及其在水蒸 汽中的循环氧化行为. 中南大学学报: 自然科学版, 2009, 40(4): 956) [5] Chen Z X, Xu X C, Wang B, et al. Plastic deformation and dynamic recrystallization of T91 steel at high tem￾perature. J Univ Sci Technol Beijing, 2012, 34(3): 298 (陈振湘, 徐晓嫦, 王斌, 等. T91 钢的高温塑性变形及动态 再结晶行为. 北京科技大学学报, 2012, 34(3): 298) [6] Wang L M, Ye X N, Jiang L Z, et al. Study on application of RE in a new type of saving Ni austenitic heat-resistant steel. J Chin Rare Earths Soc, 2010, 28(Spec Iss): 427 (王龙妹, 叶晓宁, 江来珠, 等. 稀土在新型节镍奥氏体耐热 不锈钢中的应用研究. 中国稀土学报, 2010, 28(专辑): 427) [7] Chen L, Liu X, Du X J, et al. Effect of rare earths on high temperature mechanical properties of austenitic heat￾resistant steel. J Chin Rare Earths Soc, 2009, 27(6): 829 (陈雷, 刘晓, 杜晓建, 等. 微量稀土对奥氏体耐热钢高温力 学性能的影响. 中国稀土学报, 2009, 27(6): 829)