Microstructure and Property Analysis of AerMet100 Steel Manufactured by In-situ Rolling Mixed Wire Arc Additive Manufacturing

作     者：NI Jiaming LEI Lei LI Baohui LIU Siyu CHENG Peng ZHANG Haiou 

作者机构：Shanghai Aerospace Precision Machinery InstituteShanghai 201600China School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074HunanChina 

出 版 物：《上海航天（中英文）》 (Aerospace Shanghai（Chinese&English）)

年 卷 期：2022年第39卷第1期

页      面：205-216页

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

主　　题：wirearc additive manufacturing(WAAM) AerMet100 steel martensitic steel in-siturolling 

摘      要：Aer Met100 steel thick wall is fabricated by in-situ rolling composite wire arc additive manufacturing(WAAM).The microstructure and mechanical properties of Aer Met100 steel after heat treatment are studied.The results show that after the introduction of in-situ rolling force,the grain of Aer Met100 steel is broken,the anisotropy is eliminated,and the microstructure is refined obviously.The microstructure of Aer Met100 steel after heat treatment is mainly lath martensite and reverse austenite.There are 40 nm-68.6 nm alloy carbides precipitated in the martensitic matrix,and the hardening mechanism is mainly Orowan bypass strengthening.The film-like reverse austenite with the thickness ranging from 2 nm to 5 nm exists between the martensitic lath,which improves the toughness of the maraging steel.Good combination of strength and toughness can be achieved through proper heat treatment process.