Effect of Precipitation Behavior and Deformation Twinning Evolution on the Mechanical Properties of 16Cr-25.5Ni-4.2Mo Superaustenitic Stainless Steel Weld Metals  

作　　者：Chenghao Liu Wenchao Dong Jian Sun Shanping Lu 

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China [3]CAS Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第2期338-352,共15页金属学报(英文版)

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA0410201);the Natural Science Foundation of Heilongjiang Province(No.TD2021E006);the Liaoning Provincial Doctoral Initiation Fund Project(No.2022-BS-008);the China Postdoctoral Science Foundation(No.2023T160654).

摘　　要：In the study,three 16Cr-25.5Ni-4.2Mo superaustenitic stainless steel weld metals with C contents of 0.082 wt%,0.075 wt%,and 0.045 wt%,were prepared to investigate the microstructural evolution and its effect on mechanical behavior.At a C content of 0.082 wt%,the microstructure of weld metal consisted of austenite,M_(6)C,and M_(23)C_(6),where M_(6)C was the main carbide.The number and average size of the M_(6)C carbides significantly decreased as the C content decreased.At a C content of 0.045 wt%,only a very small number of M_(6)C carbides were observed in the weld metal.For the tensile process,the number of deformation twins increased as the C content decreased,which introduced a stronger dynamic Hall-Petch effect,resulting in only a small decrease in the ultimate tensile strength of the weld metal.Meanwhile,the increase in deformation twins significantly enhanced the elongation of the weld metals.For the impact process,the impact energy increased from 204 to 241 J as the C content decreased.The crack initiation resistance was improved due to the reduction in M_(6)C carbide,which inhibited cracking at the interface of M_(6)C/matrix.Additionally,the crack propagation resistance was enhanced due to the increase in deformation twins,which consumed more impact energy.

关 键 词：Superaustenitic stainless steel weld metal Microstructural evolution Carbides Mechanical properties Deformation twins 

分 类 号：TG441.8[金属学及工艺—焊接] TG142.1[一般工业技术—材料科学与工程]