高温合金GH4169的动态再结晶和组织演化机制  

Dynamic Recrystallization and Microstructure Evolution Mechanism of GH4169 Alloy

作　　者：于森 陈乐利 罗锐[1,3] 袁志钟 王爽[1] 高佩 程晓农[1] 无 YU Sen;CHEN Leli;LUO Rui;YUAN Zhizhong;WANG Shuang;GAO Pei;CHENG Xiaonong;无(School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,China;Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology,Nanjing Institute of Technology,Nanjing 211167,China;Jiangsu Yinhuan Precision Steel Tube Co.,Ltd.,Yixing 214203,China)

机构地区：[1]江苏大学材料科学与工程学院,镇江212013 [2]南京工程学院江苏省先进结构材料与应用技术重点实验室,南京211167 [3]江苏银环精密钢管有限公司,宜兴214203

出　　处：《材料研究学报》2023年第3期211-218,共8页Chinese Journal of Materials Research

基　　金：江苏省先进结构材料与应用技术重点实验室开放基金(ASMA202002);中国博士后科学基金(2019M661738)。

摘　　要：应用Gleeble热模拟技术、EBSD、SEM和OM系统地研究了高温合金GH4169在温度为1000~1150℃、应变速率为0.01~1 s^(-1)条件下变形的动态再结晶机制和组织演变规律。结果表明:在1000~1150℃、应变速率为0.01~1 s^(-1)条件下高温合金GH4169的变形抗力最高可达400 MPa;基于动态材料模型绘制出此合金的功率耗散图和流变失稳图,得到了该合金优化的加工区间变形参数为1020~1070℃和0.03~0.63 s^(-1)。分析GH4169在变形过程中动态再结晶演化规律,明确了动态再结晶晶粒以在原奥氏体晶界处的非连续动态再结晶为主,连续动态再结晶以亚晶持续旋转机制形核。还确定了Σ3n非共格孪晶界演变规律,动态再结晶晶粒的体积分数比越大晶粒越细小Σ3晶界密度越高,动态再结晶晶粒的长大优先于Σ3n非共格孪晶界的形成。The dynamic recrystallization mechanism and microstructure evolution of superalloy GH4169 during isothermal compression by strain rate of 0.01~1 s^(-1)at temperature within the range of 1000~1150℃were systematically investigated via Gleeble thermal simulation technology,EBSD,SEM and OM.The results show that the maximum deformation resistance of the alloy can reach 400 MPa by the desired deformation parameters.The power dissipation diagram and rheological instability diagram of GH4169 were plotted based on the dynamic material model,and the deformation parameters of 1020℃~1070℃and 0.03~0.63 s^(-1),which were taken as the optimal processing interval for the GH4169 alloy.The evolution regularity of dynamic recrystallization during the deformation process of GH4169 was analysed.It is clear that the dynamic recrystallization is mainly initiated by the discontinuous dynamic recrystallization at grain boundaries of the original austenite,while the continuous dynamic recrystallization may be due to the nucleation induced through the continuous rotation of sub-grains.The evolution regularity ofΣ3n non-coherent twin boundary was determined.The larger the volume fraction of dynamic recrystallization grains,the much smaller the size of grains and the higher the density ofΣ3 non-coherent twin boundaries.The growth of dynamic recrystallization grains takes the precedence over the formation ofΣ3n non-coherent twin boundary.

关 键 词：金属材料 高温合金GH4169 热变形 动态再结晶 Σ3n非共格孪晶 

分 类 号：TG132.32[一般工业技术—材料科学与工程]