Formation of Fe-19 wt%Cr-9 wt%Ni Nanocrystalline Alloy with Excellent Corrosion Resistance: Phase Transition and Microstructure

作     者：Chongfeng Sun Shengqi Xi Xiaofeng Dang Jianping Li Yongchun Guo Zhong Yang Yaping Bai Chongfeng Sun;Shengqi Xi;Xiaofeng Dang;Jianping Li;Yongchun Guo;Zhong Yang;Yaping Bai

作者机构：School of Materials and Chemical EngineeringXi'an Technological UniversityXi'an 710021China State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China 

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

年 卷 期：2021年第34卷第6期

页      面：825-833页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financial support of the National Natural Science Foundation of China (Nos. 51271143 and 51705391) the Fundamental Research Funds for the Central Universities,Key and Shaanxi creative talents promotion plan-technological innovation team (No. 2017KCT-05) the Project of equipment pre-research field fund (No. 6140922010301) 

主　　题：Mechanical alloying Hot pressing sintering Nanocrystalline alloy Phase transition Corrosion resistance 

摘      要：In this paper,microstructure characteristics and phase transitions of Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy are comprehensively studied during the mechanical alloying and hot pressing sintering *** resistance of the sintered Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy samples is further *** the mechanical alloying process,Fe-19 wt%Cr-9 wt%Ni nanocrystalline alloy powders mainly composed of metastable ferrite phase are obtained after mechanical alloying for 8,16 and 24 h,*** the subsequent hot pressing sintering process,the phase transitions(from ferrite to austenite)occur from 650 to 750°C for Fe-19 wt%Cr-9 wt%Ni alloy powders milled for 24 *** the sintering temperature is raised to 1050°C for 1 h,the ferrite phase has transformed into austenite phase completely,and the obtained grain size of sintered Fe-19 wt%Cr-9 wt%Ni alloy is around 40 *** test of the sintered Fe-19 wt%Cr-9 wt%Ni alloy has been operated in 0.5 mol L^(-1) H_(2)SO_(4) solution to show the corrosion resistance *** show that the sintered Fe-19 wt%Cr-9 wt%Ni alloy exhibits excellent corrosion resistance,which is proved by higher self-corrosion potential,lower self-corrosion current density and larger capacitive reactance,compared with that of commercial 304 stainless steel.