新型无磁合金高温变形行为与组织演变研究  

High temperature deformation behavior and microstructure evolution of new non-magnetic alloys

作　　者：杨晨星 杨卯生[2] 赵昆渝[1] 李建新 王松 YANG Chen-xing;YANG Mao-sheng;ZHAO Kun-yu;LI Jian-xin;WANG Song(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Institute for Special Steel,Central Iron and Steel Research Institute,Beijing 100081,China;Fushun Special Steel shares Co.,Ltd.,Fushun 113006,China;AECC Harbin Bearing Co.,Ltd.,Harbin 150500,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081 [3]抚顺特殊钢股份有限公司,辽宁抚顺113006 [4]中国航发哈尔滨轴承有限公司,黑龙江哈尔滨150500

出　　处：《塑性工程学报》2020年第2期114-127,共14页Journal of Plasticity Engineering

摘　　要：利用Gleeble-3800热模拟试验机,在变形温度为1050~1200℃,应变速率为0. 1~10 s^-1,变形量为20%、40%和60%的条件下,对00Cr40Ni55Al3Ti无磁合金进行热压缩变形实验,研究了变形量、应变速率和变形温度等变形工艺参数对00Cr40Ni55Al3Ti无磁合金组织演变及流变应力的影响规律,建立了00Cr40Ni55Al3Ti无磁合金热变形的本构方程和热加工图。结果表明:00Cr40Ni55Al3Ti无磁合金的临界变形量为10. 8%,变形量大于此临界值时,合金中的奥氏体发生动态再结晶和球状α-Cr相形核长大;应变速率为0. 1 s^-1时,合金发生不连续动态再结晶,应变速率为5 s^-1时,晶界处球状α-Cr相形核长大引起变形不协调,在峰值应力后出现软化波动现象;合金变形量为60%时的热变形激活能为397. 077 k J·mol^-1。根据热加工图确定适宜的热加工区域为:变形温度为1080~1100℃、应变速率为0. 1~0. 35 s^-1和变形温度为1120~1190℃、应变速率为4. 5~10 s^-1,合金在该区域进行锻造可获得质量良好的锻件。The hot compression deformation experiments of 00Cr40Ni55Al3Ti non-magnetic alloy were carried out under the condition of deformation temperature of 1050-1200 ℃,strain rate of 0. 1-10 s^-1,deformation amount of 20%,40% and 60% on Gleeble-3800 thermal simulator. The effect law of deformation process parameters such as deformation amount,strain rate and deformation temperature on microstructural evolution and flow stress of 00Cr40Ni55Al3Ti non-magnetic alloy was studied. The constitutive equation and hot working map of 00Cr40Ni55Al3Ti non-magnetic alloy were established. The results show that the critical deformation amount of00Cr40Ni55Al3Ti non-magnetic alloy is 10. 8%. Dynamic recrystallization of austenite as well as nucleation and growth of spherical α-Cr phase occur in the alloy when the deformation amount is larger than the critical value. Discontinuous dynamic recrystallization occurs in the alloy when the strain rate is 0. 1 s^-1. The inconsistency of deformation and softening fluctuation after peak stress are caused by the growth of spherical α-Cr phase at grain boundary when the strain rate is 5 s^-1. The hot deformation activation energy is 397. 077 k J·mol^-1 with deformation amount of 60%. According to the hot working map,the suitable hot working area is determined: deformation temperature of1080-1100 ℃,strain rate of 0. 1-0. 35 s^-1 and deformation temperature of 1120-1190 ℃,strain rate of 4. 5-10 s^-1. The alloy forged in these area can obtain forgings with good quality.

关 键 词：00Cr40Ni55Al3Ti无磁合金 动态再结晶 热加工图 本构方程 Α-CR相 

分 类 号：TG144[一般工业技术—材料科学与工程]