Coupling Effect Mechanism of theδ-Ferrite and M_(23)C_(6) on the Mechanical Properties of 9Cr-Steel Deposited Metals  

作　　者：Qishan Sun Shitong Wei Shanping Lu 

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

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第1期121-138,共18页金属学报(英文版)

基　　金：supported by the LingChuang Research Project of China National Nuclear Corporation,China Institute of Atomic Energy(E141L803J1);the Natural Science Foundation of Heilongjiang Province(No.TD2021E006).

摘　　要：9Cr ferritic/martensitic(9Cr F/M)steels are considered ideal structural materials for various nuclear energy systems.However,δ-ferrite(δ),as a controlled phase,may occur in its welds.Three deposited metals with different carbon contents(0.04,0.07,and 0.10 wt%)were investigated using experimental and finite element simulation methods.The results showed that the incomplete peritectic reaction,the incompleteδto austenite phase transition,and the segregation of ferrite-stabilized elements led to the residualδ.The amount and morphology ofδsignificantly influence the mechanical properties.After increasing the carbon content,the increase in strength comes mainly from precipitation strengthening and dislocation strengthening,the presence ofδwill reduce the strength.During the impact process,δaffects the absorbed energy for the stable crack growth through its morphology,and M_(23)C_(6)affects the crack formation energy through its quantity.By decreasing the carbon content to a certain extent,the reduction of M_(23)C_(6)content and the generation of large polygonalδcan effectively improve the toughness of 9Cr-steel deposited metals.

关 键 词：Deposited metals 9Cr-steels Δ-FERRITE Mechanical properties 

分 类 号：TG142.71[一般工业技术—材料科学与工程]