Interactions between Pre-strain and Dislocation Structures and Its Effect on the Hydrogen Trapping Behaviors  

作　　者：Rongjian Shi Yanqi Tu Liang Yang Saiyu Liu Shani Yang Kewei Gao Xu-Sheng Yang Xiaolu Pang 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083,China [2]School of Mathematics and Physics,University of Science and Technology Beijing,Beijing,100083,China [3]Department of Industrial and Systems Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China [4]Hong Kong Polytechnic University Shenzhen Research Institute,Shenzhen,518057,China [5]Key Laboratory for Advanced Materials of Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2023年第7期1193-1202,共10页金属学报（英文版）

基　　金：The authors acknowledge the financial support received from the National Natural Science Foundation of China(Nos.52201060,51922002,and 52001182);the China Postdoctoral Science Foundation(Nos.BX20220035 and 2022M710347);the Science Center for Gas Turbine Project(No.P2022-B-IV-008-001).

摘　　要：This work investigated the effect of pre-strain and microstructures and their interactions on hydrogen trapping behaviors in case of 1-GPa high-strength martensitic steel Fe-0.05C-0.30Si-1.10Mn-3.50Ni-0.53Cr-0.50Mo-0.03 V(wt%).We found that the trapped reversible and trapped irreversible hydrogen contents increased significantly after applying a pre-strain of 5%,with an increase in the trapped reversible hydrogen content from 0.6 ppm in the original sample to 2.1 ppm.The hydrogen desorption activation energy also showed a slight increase.The microstructural evolution revealed that the concomitant dislocation cell-twin duplex microstructure with high-density tangled dislocations after pre-strain substantially increased the trapped reversible hydrogen contents.Additionally,the tangled dislocations pinned by the nanoprecipitates acted as deep irreversible hydrogen traps,increasing the trapped hydrogen at high temperatures after applying 5%pre-strain.These findings provide an expanded understanding of the hydrogen trapping behaviors of pre-strained microstructures.

关 键 词：Hydrogen embrittlement Hydrogen trapping PRE-STRAIN Deformed microstructure High-strength steel 

分 类 号：TG142.1[一般工业技术—材料科学与工程]