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Materials, Vol. 11, Pages 788: Effect of Cementite on the Hydrogen Diffusion/Trap Characteristics of 2.25Cr-1Mo-0.25V Steel with and without Annealing

Materials, Vol. 11, Pages 788: Effect of Cementite on the Hydrogen Diffusion/Trap Characteristics of 2.25Cr-1Mo-0.25V Steel with and without Annealing

Materials doi: 10.3390/ma11050788

Authors: Yan Song Zelin Han Mengyu Chai Bin Yang Yilun Liu Guangxu Cheng Yun Li Song Ai

Hydrogen embrittlement (HE) is a critical issue that affects the reliability of hydrogenation reactors. The hydrogen diffusivity/trap characteristics of 2.25Cr-1Mo-0.25V steel are important parameters mainly used to study the HE mechanism of steel alloys. In this work, the hydrogen diffusivity/trap characteristics of heat-treated (annealed) and untreated 2.25Cr-1Mo-0.25V steel were studied using an electrochemical permeation method. The microstructures of both 2.25Cr-1Mo-0.25V steels were investigated by metallurgical microscopy. The effect of cementite on the hydrogen diffusivity/trap mechanisms was studied using thermodynamics-based and Lennard–Jones potential theories. The results revealed that the cementite located at the grain boundaries and at the interfaces of lath ferrite served as a kind of hydrogen trap (i.e., an irreversible hydrogen trap). In addition, hydrogen was transported from ferrite to cementite via up-hill diffusion, thereby supporting the hypothesis of cementite acting as a hydrogen trap.

Authors:   Song, Yan ; Han, Zelin ; Chai, Mengyu ; Yang, Bin ; Liu, Yilun ; Cheng, Guangxu ; Li, Yun ; Ai, Song
Journal:   Materials
Volume:   11
edition:   5
Year:   2018
Pages:   788
DOI:   10.3390/ma11050788
Publication date:   12-May-2018
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