Flow behaviors and microstructural evolutions of nickel-based ODS superalloys during hot deformation  

作　　者：Wuqiang He Feng Liu Liming Tan Lan Huang Shiwen He Caihe Fan 

机构地区：[1]College of Materials and Advanced Manufacturing,Hunan University of Technology,Zhuzhou 412007,China [2]State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China [3]Powder Metallurgy Research Institute,Central South University,Changsha 410083,China

出　　处：《Journal of Materials Science & Technology》2024年第33期13-26,共14页材料科学技术(英文版)

基　　金：supported by supported by the National Natu-ral Science Foundation of China(No.52271177);the Leading Tal-ents Project of Scientific and Technological Innovation in Hunan Province(No.2021RC4036);the Natural Science Foundation of Hu-nan Province(Nos.2023JJ50172 and 2020JJ6069).

摘　　要：The hot deformation behaviors of nickel-based oxide dispersion strengthened(ODS)superalloys fabricated by mechanical alloying(MA)and hot extrusion(HEX)were investigated,the hot compression tests were performed to obtain true stress-true strain curves,the influence of strain rate and temperature connected with the microstructure evolution was analyzed,and the processing map and microstructure proposed at different strain levels was used to select its hot working parameters.The results illustrated that hot working conditions,especially the temperature,strongly influenced the grain structure.Specifi-cally,deforming under high temperatures and low strain rate conditions enhances dynamic softening via dynamic recovery(DRV),dynamic recrystallization(DRX),and grain growth to consume the stored strain energy.In addition,the size and morphology of nanoparticles are not significantly changed before and after deformation,the nanoparticles and the matrix still maintain a good interface combination,and no interfacial mismatch such as nanosvoids between the nanoparticle and matrix is detected due to their outstanding interfacial binding ability and excellent ductility of matrix.

关 键 词：Nickel-based ods superalloys Hot deformation Processing map MICROSTRUCTURE 

分 类 号：TG1[金属学及工艺—金属学]