Effect of tempering on carbides and hydrogen embrittlement in E690 high strength marine structural steel
Yi Luo 1,2, Wei Li1,2, Peng-wei Zhou2, Yuan-tao Xu2, Hui-yong Pang3, Ning Zhong4, Hui-sheng Jiao5, Xue-jun Jin1,2
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
Effect of tempering on carbides and hydrogen embrittlement in E690 high strength marine structural steel
Yi Luo 1,2, Wei Li1,2, Peng-wei Zhou2, Yuan-tao Xu2, Hui-yong Pang3, Ning Zhong4, Hui-sheng Jiao5, Xue-jun Jin1,2
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
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 C 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 (M23C6 and MX) coarsen with the tempering time increasing. After tempered at 600 °C 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.
Abstract：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 C 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 (M23C6 and MX) coarsen with the tempering time increasing. After tempered at 600 °C 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.
Yi Luo,Wei Li,Peng-wei Zhou, et al. Effect of tempering on carbides and hydrogen embrittlement in E690 high strength marine structural steel[J]. Journal of Iron and Steel Research International, 2022, 29(10): 1669-1682.
2022, Vol. 29 
