Dynamic Tensile Mechanical Properties of 18ni350 Maraging Steel Fabricated by Wire Arc Additive Manufacturing

作     者：Duan, Mengwei Bai, Guanshun Guo, Shun Peng, Yong Liu, Xuequan Zhang, Wei Zhang, Xiaoyong Huang, Yong Liu, Jizi Gao, Guangfa Kong, Jian Zhou, Qi Wang, Kehong 

作者机构：School of Materials Science and Engineering Nanjing University of Science and Technology Jiangsu210094 China Ministry of Industry and Information Technology Key Laboratory of Controlled Arc Intelligent Additive Technology Nanjing University of Science and Technology Jiangsu210094 China National Key Laboratory of Special Vehicle Design and Manufacturing Integration Technology Baotou014030 China The Ningbo Branch of Ordnance Science Institute of China Zhejiang315103 China School of Mechanical Engineering Nanjing University of Science and Technology Jiangsu210094 China 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Anisotropy 

摘      要：The 18Ni350 maraging steel (M350) bulk was fabricated by wire arc additive manufacturing (WAAM). The heat treatment process of solution at 1000℃ for 1 hour and aging at 490℃ for 6 hours was selected, and then the split Hopkinson tensile bar (SHTB) was employed for dynamic tensile test. Three dynamic tensile tests with different strain rates were carried out for the as-built and heat-treated samples in the horizontal and vertical directions. After the tensile impact loading was applied to the sample, it was found that the yield stress (YS) of sample firstly increased and then decreased with the strain rate, and the sample in the vertical direction performed high dynamic strength. The YS of the as-built sample reached the maximum value of 2195MPa at the strain rate of 1230s-1. When the strain rate came to 1660s-1, the YS of the heat-treated sample reached the maximum value of 3395MPa. As-built sample showed micro void accumulation ductile fracture behavior. A large number of ultra-fine dimples were found in the fracture of the as-built samples around the main dimples, which confirmed the heterogeneous fracture caused by the inhomogeneity of the WAAMed samples. After heat treatment, quasi-cleavage characteristics became more obvious and heat-treated samples tend to brittle fracture. Through EBSD characterization, it was found that the deformation coordination ability of as-built sample was stronger than that of the heat-treated sample. Finally, the hardening model and anisotropic model of the strain rate sensitive material fabricated by WAAM were established basing on the dynamic tensile properties. © 2023, The Authors. All rights reserved.