Numerical study on hydrogen permeation of ferritic steel evaluated under constant load

被引:8
作者
Kim, S. J. [1 ]
Yun, D. W. [2 ]
Jung, H. G. [1 ]
Kim, K. Y. [3 ]
机构
[1] POSCO Steel Solut Ctr, Pohang 790704, South Korea
[2] KIMS, 797 Changwondaero, Chang Won 642831, South Korea
[3] Pohang Univ Sci & Technol POSTECH, GIFT, 77 Cheongam Ro, Pohang 790784, South Korea
关键词
Steel; Hydrogen permeation; Hydrogen diffusion; Tensile stress; Hydrogen-assisted cracking; HIGH-STRENGTH STEEL; LINE PIPE STEEL; INDUCED CRACKING; NONMETALLIC INCLUSIONS; PLASTIC-DEFORMATION; TENSILE-STRESS; DIFFUSION; TRANSPORT; MICROSTRUCTURE; SUSCEPTIBILITY;
D O I
10.1080/02670836.2016.1162001
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Hydrogen permeation of two kinds of ferritic steel with different level of 2nd phase particles are compared utilising electrochemical permeation technique evaluated under various loads. This study indicates that tensile stress in plastic domain induces expansion of the interface between the 2nd phase particles and steel matrix, and formation of blister crack. Such microstructural-discontinuity provides additional hydrogen traps, resulting in slower diffusion and lower steady-state permeation flux. These phenomena appear predominantly in steel containing coarse-sized inclusion and precipitate having sharp extremities. The numerical analysis also supports that the steel containing coarse-sized 2nd phase particles with sharp extremities exhibits higher parameters of hydrogen capture rate per irreversible traps and blister crack formation rate than the steel containing fine-sized ones with spherical shape.
引用
收藏
页码:149 / 161
页数:13
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