2Cr11Mo1VNbN叶片钢的热变形行为  

Hot Deformation Behavior of 2Cr11Mo1VNbN Steel Used for Steam

作　　者：姚斌 Turbine Blades(Sichuan Changcheng Special Steel Co.,Ltd.,Pangang Group,Jiangyou,Sichuan 621701,China)

机构地区：[1]攀钢集团江油长城特殊钢有限公司,四川省江油621701

出　　处：《特钢技术》2021年第3期26-29,共4页Special Steel Technology

摘　　要：利用Gleeble-3800热模拟试验机,在温度为950-1200℃、应变速率为0.01^(-10) s^(-1)下进行了70%变形量的热压缩试验,研究和分析了汽轮机叶片用2Cr11Mo1VNbN钢的高温塑性变形及动态再结晶行为,并绘制了合金的热加工图。结果表明:2Cr11Mo1VNbN钢的真应力应变曲线具有动态再结晶特征,在950~1200℃,变形速率为0.01~10 s^(-1)时,都能够发生再结晶。再结晶晶粒尺寸随着变形温度的增加或变形速率的降低呈增加趋势。在950~1200℃变形温度下,当变形速率为0.01 s^(-1),晶粒尺寸迅速增大。在真应力应变曲线的基础上,建立了材料热变形本构方程,其热激活能为407.57 kJ/mol。根据不同应变速率下的峰值应力绘制了加工图,显示了能量消耗效率随温度和应变速率的变化。合金的最佳热加工区间为950~1150℃,变形速率为0.1~10 s^(-1)。The hot deformation characteristics of 2Cr11Mo1VNbN martensite steel at the temperature range of 950-1200℃and strain rate range of 0.01^(-10) s^(-1) were investigated by means of hot compression tests under 70 per-cent deformation with Gleeble-3800.The results show that the true stress-strain curve of 2Cr11Mo1VNbN steel has the characteristics of dynamic recrystallization.Recrystallization can occur at 950-1200℃and the deformation rate is 0.01-10 s^(-1).The recrystallized grain size increased with the increase of deformation temperatures or the decrease of de-formation rates.When the deformation rate is 0.01 s^(-1) with deformation temperature of 950-1200℃,the grain size in-creased quickly.The constitutive equation for the alloy is established on basis of the true stress strain curves,and the acti-vation energy(Q)of the alloy is about 407.57 kJ/mol.The processing map is developed based on the peak stress at differ-ent strain rate and showing variations of the efficiency of power dissipation related to temperature and strain rate.The op-timum hot working temperature and strain rate are 950-1150℃and 0.1-10 s^(-1) respectively.

关 键 词：汽轮机叶片 热变形 热加工图 本构方程 

分 类 号：TG142.15[一般工业技术—材料科学与工程]