Effect of High Density Current Pulses on Microstructure and Mechanical Properties of Dual-Phase Wrought Superalloy

作     者：Jun Zhang Ji-De Liu Xin-Fang Zhang Chuan-Yong Cui Jin-Guo Li Yi-Zhou Zhou Bao-Quan Wang Jing-Dong Guo Jun Zhang;Ji-De Liu;Xin-Fang Zhang;Chuan-Yong Cui;Jin-Guo Li;Yi-Zhou Zhou;Bao-Quan Wang;Jing-Dong Guo

作者机构：State Key Laboratory of Advanced MetallurgySchool of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2021年第34卷第12期

页      面：1635-1644页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This work was financially supported by the National Key R&D Program of China(No.2020YFA0714900) the National Natural Science Foundation of China(Nos.51874023,U1860206,51871221.51671189 and 51971231) the Fundamental Research Funds for the Central Universities(No.FRF-TP-20-02B) the Recruitment Program of Global Experts and the Ministry of Science and Technology of China(Nos.2017YFA0700703 and 2019YFA0705304) 

主　　题：Electric current pulse Superalloys Precipitation Grain size Mechanical properties 

摘      要：In this study,high density electric current pulse(ECP)treatment was introduced instead of the conventional solution treatment,and theγ′phase was completely dissolved under the ECP treatment within only several milliseconds at 1148°*** to the extremely short treatment time and high cooling rate,the growth ofγ-phase matrix grain andγ′phase precipitate was effectively *** comparing with the conventional heat process,the grain size of ECP treated sample was controlled to about 15μm,the size of the re-precipitatedγ′phase reduced from 65 to 35 nm,and the number density ofγ′precipitate increased from 1.46×108 to 3.03×108/*** Vickers hardness,ultimate tensile strength and yield strength of the ECP treated sample were significantly *** to the theoretical derivation of kinetics,the ECP treatment introduces an extra electrical free energy which promoted the dissolution ofγ′*** ECP treatment may provide a new method for solution treatment of the Ni-based superalloy.