Microstructure and mechanical properties of high-strength low alloy steel by wire and arc additive manufacturing

作     者：Yi-li Dai Sheng-fu Yu An-guo Huang Yu-sheng Shi Yi-li Dai;Sheng-fu Yu;An-guo Huang;Yu-sheng Shi

作者机构：State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2020年第27卷第7期

页      面：933-942页

核心收录：

学科分类：080503[工学-材料加工工程] 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）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：financially supported by the National Key R&D Program of China(No.2017YFB1103200) the Independent Innovation Research Fund Project of Huazhong University of Science and Technology(No.2018KFYXMPT002) 

主　　题：wire and arc additive manufacturing high strength low alloy steel microstructure inclusions fine grain ferrite mechanical properties 

摘      要：A high-building multi-directional pipe joint(HBMDPJ)was fabricated by wire and arc additive manufacturing using high-strength low-alloy(HSLA)*** microstructure characteristics and transformation were observed and *** results show that the forming part includes four *** solidification zone solidifies as typical columnar crystals from a molten *** complete austenitizing zone forms from the solidification zone heated to a temperature greater than 1100℃,and the typical columnar crystals in this zone are difficult to *** partial austenitizing zone forms from the completely austenite zone heated between Ac1(austenite transition temperature)and1100℃,which is mainly equiaxed *** several thermal cycles,the partial austenitizing zone transforms to the tempering zone,which consistes of fully equiaxed *** the solidification zone to the tempering zone,the average grain size decreases from 75 to20μ*** mechanical properties of HBMDPJ satisfies the requirement for the intended application.