Dynamic recrystallization mechanism of as-cast nickel base superalloy N10276 during primary hot working  

作　　者：Xin-chao Wang Yan Wang Xiao-jie Lian Mei Xu Li-feng Hou Ying-hui Wei 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China [2]State Key Laboratory of Advanced Stainless Steel Materials,Taiyuan Iron and Steel(Group)Co.,Ltd.,Taiyuan 030003,Shanxi,China [3]Technology Center,Shanxi Taiyuan Stainless Steel Co.,Ltd.,Taiyuan 030003,Shanxi,China

出　　处：《Journal of Iron and Steel Research International》2023年第4期825-837,共13页

基　　金：the Central Government Guided Local Special Funds(YDZX20191400002094);the Key Scientific Research Project in Shanxi Province(20191102006);the Special Project for Research and Development of Key Core Technologies and Common Technologies in Shanxi Province(20201102017);the Shanxi Applied Basic Research Plan(201901d111460).

摘　　要：The dynamic recrystallization(DRX)mechanism of as-cast nickel base superalloy N10276 during primary hot working was investigated by compression tests at temperatures of 1000–1200℃ and strain rates between 0.01 and 10 s^(-1).Optical microscopy,scanning electron microscopy,electron backscattered diffraction technique and transmission electron microscopy were used to characterize the evolution of microstructure.At higher deformation temperature or lower strain rate,the true stress–true strain curves exhibit the characteristic of a peak stress followed by a steady state flow stress under large strains,confirming the occurrence of DRX.The degree of DRX increases with elevating deformation temperature.With the progress of DRX,low angle grain boundaries gradually decrease,while high angle grain boundaries increase continuously.Microstructure studies have shown that discontinuous dynamic recrystallization is the main recrystallization mechanism.Since there are few original grain boundaries and twin boundaries,and lack of second phase particles for particle stimulated nucleation,geometrically necessary boundaries are formed as supplementary nucleation sites through sub-grain boundary rotation and deformation twin boundaries.The annealing twins dominated by Σ3 grain boundaries are generated in large quantities during the growth of recrystallized grains.

关 键 词：Dynamic recrystallization mechanism As-cast superalloy N10276 Primary hot working TWIN 

分 类 号：TG146[一般工业技术—材料科学与工程]