Effect of tempering on carbides and hydrogen embrittlement in E690 high strength marine structural steel  

作　　者：Yi Luo Wei Li Peng-wei Zhou Yuan-tao Xu Hui-yong Pang Ning Zhong Hui-sheng Jiao Xue-jun Jin 

机构地区：[1]Shanghai Key Laboratory of Materials Laser Processing and Modification,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China [2]Institute of Advanced Steels and Materials,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,200240,China [3]China Wuyang Iron and Steel Co.,Ltd.,Pingdingshan,462500,Henan,China [4]School of Materials Science and Engineering,Shanghai Maritime University,Shanghai,200120,China [5]TESCAN CHINA,Shanghai,200240,China

出　　处：《Journal of Iron and Steel Research International》2022年第10期1669-1682,共14页

基　　金：The authors acknowledge the generous financial support from National Key R&D Program of China(No.2016YFB0300601);the National Natural Science Foundation of China(Nos.U1564203,51831002 and 51571141);The authors also gratefully acknowledge the support sponsored by Program of Shanghai Academic Research Leader 18XD1402200;provided by Shanghai Key Laboratory of Materials Laser Processing and Modification,Shanghai Jiao Tong University;Besides,this research was supported by the TESCAN CHINA.

摘　　要：The effect of tempering on carbides and hydrogen embrittlement in E690 high strength marine structural steel has been investigated.The steel was tempered at 600℃ for 1–3 h.Detailed characterization was carried out to characterize the microstructure,especially the dislocation density and grain size.The hydrogen permeation test and thermal desorption spectroscopy test were also implemented.The dislocation density decreases,the amount of carbide increases,and carbides(M_(23)C_(6) and MX)coarsen with the tempering time increasing.After tempered at 600℃ for 3 h,the diffusible hydrogen trapped by lattice and dislocation decreases while the non-diffusible hydrogen trapped by carbides increases,leading to the best hydrogen embrittlement resistance,although hydrogen diffuses rapidly due to the reduction of dislocation density.And the fracture mode changes from a combination of brittle cleavage and ductile dimpled fracture to fully ductile dimple fracture under hydrogen charging condition.Moreover,a phenomenon that hydrogen accelerates the dislocations movement of the steel during deformation was observed,which is related to the fact that hydrogen enhanced localized plasticity mechanism.

关 键 词：High strength marine structural steel CARBIDE TEMPERING Hydrogen embrittlement Thermal desorption spectroscopy 

分 类 号：TG142[一般工业技术—材料科学与工程]