TY - JOUR
T1 - Hydrogen-enhanced-plasticity mediated decohesion for hydrogen-induced intergranular and “quasi-cleavage” fracture of lath martensitic steels
AU - Nagao, Akihide
AU - Dadfarnia, Mohsen
AU - Somerday, Brian P.
AU - Sofronis, Petros
AU - Ritchie, Robert O.
N1 - Funding Information:
The authors gratefully acknowledge funding from the JFE Steel Corporation and the support of the International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), sponsored by the World Premier International Research Center Initiative (WPI), MEXT, Japan. The involvement of ROR was additionally supported by the Mechanical Behavior of Materials Program (KC13) at the Lawrence Berkeley National Laboratory (LBNL) funded by Office of Science, Office of Basic Energy Sciences, Materials Sciences Division of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. The authors would also like to acknowledge Prof. I.M. Robertson and Dr. S. Wang at the University of Wisconsin-Madison for fruitful discussions. A.N. acknowledges and thanks the laboratory members of the I.M.R. group, especially K.E. Nygren and M.L. Martin for assistance, support and discussions. The microscopy work was carried out in part at the Center for Microanalysis of Materials in the Frederick Seitz Materials Research Laboratory at the University of Illinois at Urbana-Champaign. Exposure of the Zn-plated steel specimens to high-pressure hydrogen gas was performed by J.A. Campbell in the Hydrogen Effects on Materials Laboratory at Sandia National Laboratories (Livermore, CA, USA). Appendix A
Publisher Copyright:
© 2018
PY - 2018/3
Y1 - 2018/3
N2 - Hydrogen embrittlement of lath martenistic steels is characterized by intergranular and “quasi-cleavage” transgranular fracture. Recent transmission electron microscopy (TEM) analyses (Nagao et al., 2012a, 2014a, 2014b, 2014c) of samples lifted from beneath fracture surfaces through focused ion beam machining (FIB) revealed a failure mechanism that can be termed hydrogen-enhanced-plasticity mediated decohesion. Fracture occurs by the synergistic action of the hydrogen-enhanced localized plasticity and decohesion. In particular, intergranular cracking takes place by dislocation pile-ups impinging on prior austenite grain boundaries and “quasi-cleavage” is the case when dislocation pile-ups impinge on block boundaries. These high-angle boundaries, which have already weakened by the presence of hydrogen, debond by the pile-up stresses. The micromechanical model of Novak et al. (2010) is used to quantitatively describe and predict the hydrogen-induced failure of these steels. The model predictions verify that introduction of nanosized (Ti,Mo)C precipitates in the steel microstructure enhances the resistance to hydrogen embrittlement. The results are used to discuss microstructural designs that are less susceptible to hydrogen-induced failure in systems with fixed hydrogen content (closed systems).
AB - Hydrogen embrittlement of lath martenistic steels is characterized by intergranular and “quasi-cleavage” transgranular fracture. Recent transmission electron microscopy (TEM) analyses (Nagao et al., 2012a, 2014a, 2014b, 2014c) of samples lifted from beneath fracture surfaces through focused ion beam machining (FIB) revealed a failure mechanism that can be termed hydrogen-enhanced-plasticity mediated decohesion. Fracture occurs by the synergistic action of the hydrogen-enhanced localized plasticity and decohesion. In particular, intergranular cracking takes place by dislocation pile-ups impinging on prior austenite grain boundaries and “quasi-cleavage” is the case when dislocation pile-ups impinge on block boundaries. These high-angle boundaries, which have already weakened by the presence of hydrogen, debond by the pile-up stresses. The micromechanical model of Novak et al. (2010) is used to quantitatively describe and predict the hydrogen-induced failure of these steels. The model predictions verify that introduction of nanosized (Ti,Mo)C precipitates in the steel microstructure enhances the resistance to hydrogen embrittlement. The results are used to discuss microstructural designs that are less susceptible to hydrogen-induced failure in systems with fixed hydrogen content (closed systems).
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U2 - 10.1016/j.jmps.2017.12.016
DO - 10.1016/j.jmps.2017.12.016
M3 - Article
AN - SCOPUS:85043401007
VL - 112
SP - 403
EP - 430
JO - Journal of the Mechanics and Physics of Solids
JF - Journal of the Mechanics and Physics of Solids
SN - 0022-5096
ER -