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Effect of Hydrogen on Nanomechanical Properties in Fe-22mn-0.6c TWIP Steel Revealed by In-Situ Electrochemical Nanoindentation

38 Pages Posted: 31 Oct 2018 First Look: Under Review

See all articles by Dong Wang

Dong Wang

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering

Xu Lu

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering

Yun Deng

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering

Xiaofei Guo

RWTH Aachen University - Steel Institute

Afrooz Barnoush

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering

Abstract

In-situ electrochemical nanoindentation was applied to study the effect of hydrogen on the mechanical properties of Fe-22Mn-0.6C TWIP steel at the nanoscale. Distinctive behaviors in three defined grain orientations: (001), (101), and (111) were investigated in a sequence of air, hydrogen ingress, and hydrogen egress processes. The obvious pop-in load drop caused by introducing hydrogen was analyzed using the classical dislocation theory in combination with the "Defactant" model, wherein hydrogen-enhanced homogenous dislocation nucleation through the reduction of the dislocation line energy and the stacking fault energy were proposed as the reasons. The dependence of pop-in behaviors on the crystallographic orientations was also discussed. Tabor relation-based models were applied to analyze the nanohardness increment, which was related to the hydrogen-enhanced lattice friction and the hydrogen-reduced plastic zone size. The different recovery behaviors of the pop-in load and nanohardness during hydrogen egress were assessed according to the different amounts of residual hydrogen in the corresponding affected zone.

Keywords: Hydrogen embrittlement, Electrochemical nanoindentation, TWIP steel, Dislocation nucleation, Nanohardness

Suggested Citation

Wang, Dong and Lu, Xu and Deng, Yun and Guo, Xiaofei and Barnoush, Afrooz, Effect of Hydrogen on Nanomechanical Properties in Fe-22mn-0.6c TWIP Steel Revealed by In-Situ Electrochemical Nanoindentation (October 31, 2018). Available at SSRN: https://ssrn.com/abstract=3275462

Dong Wang (Contact Author)

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering

Trondheim NO-7491
Norway

Xu Lu

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering

Trondheim NO-7491
Norway

Yun Deng

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering

Trondheim NO-7491
Norway

Xiaofei Guo

RWTH Aachen University - Steel Institute

Templergraben 55
52056 Aachen, 52056
Germany

Afrooz Barnoush

Norwegian University of Science and Technology (NTNU) - Department of Mechanical and Industrial Engineering ( email )

Trondheim NO-7491
Norway

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