Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 802, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.140638
Keywords
Twinning-induced plasticity (TWIP) steel; Hydrogen embrittlement (HE); Deformation twinning; Secondary cracks; Electron backscatter diffraction (EBSD); Electron channeling contrast imaging (ECCI)
Categories
Funding
- Research Council of Norway through the HyF-Lex project [244068/E30]
- Research Council of Norway through the HyLINE project [294739]
- German Research Foundation
- China Scholarship Council
Ask authors/readers for more resources
The hydrogen embrittlement behavior of Fe-22Mn-0.6C TWIP steel was studied using in-situ SEM observation, EBSD, and ECCI techniques. Hydrogen pre-charging decreased mechanical properties and caused a ductile-to-brittle fracture transition. The threshold hydrogen content for this transition was determined using TDS analysis and hydrogen diffusion calculation. LAGBs showed better resistance to crack initiation and propagation compared to HAGBs, with stress concentration and hydrogen effects at grain boundaries intersecting with deformation twins identified as reasons for crack initiation and propagation.
The hydrogen embrittlement (HE) behavior on a Fe-22Mn-0.6C twinning-induced plasticity (TWIP) steel was investigated by tensile tests with in-situ scanning electron microscope observation combined with electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI) techniques. The tensile test specimens were cathodically pre-charged with hydrogen for 0, 50, 150, and 300 h, which accumulatively reduced the mechanical properties and induced a ductile-to-brittle fracture transition. The threshold of hydrogen content to trigger this ductile-to-brittle transition was further determined by combined thermal desorption spectroscopy (TDS) analysis and theoretical hydrogen diffusion calculation. During the tensile tests, intergranular secondary cracks were observed on the gauge surfaces of the specimens with pre-charged hydrogen. The low angle grain boundaries (LAGBs) exhibited better resistance to both crack initiation and propagation compared with high angle grain boundaries (HAGBs). In addition, the stress concentration together with the hydrogen effect on grain boundaries intersected with deformation twins are proposed as the reasons for the crack initiation and propagation.Y
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available