Lamella Multiple Grained Structure Making 2205 Duplex Stainless Steel with Superior Strength and Ductility  

作　　者：SHI Yu SONG Yi LA Peiqing ZHENG Yuehong LI Zhengning 石玉;SONG Yi;喇培清;ZHENG Yuehong;LI Zhengning(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2021年第5期754-760,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(No.51561020)。

摘　　要：We demonstrate a 2205 duplex stainless steel(DSS)synthesized by aluminothermic reaction and followed two-step rolling which had a superior yield strength of 863 MPa,ultimate tensile strength of1103 MPa and an elongation of 21%at room temperature.The phase,grain size and distribution of the steel were characterized by optical microscope,X-ray diffraction,electron back-scatter diffraction and transmission electron microscope.The results show that the steel consists of lamellar ferrite and austenitic phase with multiple grain size distribution from nanoscale to microscale.The high strength is attributed to strengthening of high back stress arising from laminated dual-phase heterogeneous ultrafine grained structure and distribution.The high ductility originates from back-stress hardening and dislocation hardening.

关 键 词：2205 duplex stainless steel back stress STRENGTH DUCTILITY 

分 类 号：TG142.71[一般工业技术—材料科学与工程]