TY - GEN
T1 - Hydrogen-assisted fatigue crack propagation in a commercially pure BCC iron
AU - Birenis, Domas
AU - Ogawa, Yuhei
AU - Matsunaga, Hisao
AU - Takakuwa, Osamu
AU - Prytz, Øystein
AU - Yamabe, Junichiro
AU - Thøgersen, Annett
N1 - Funding Information:
This work was supported by JSPS KAKENHI Grant Number JP16H04238 and JP16J02960. The Research Council of Norway is acknowledged for its support through the Norwegian Center for Transmission Electron Microscopy, NORTEM (197405/F50). This study also forms part of the “HIPP” project from the PETROMAKS2 program, funded by the Research Council of Norway [Grant Number: 102006899].
Publisher Copyright:
Copyright © 2018 ASME.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2018
Y1 - 2018
N2 - Hydrogen effect on fatigue performance of commercially pure BCC iron has been studied with a combination of various electron microscopy techniques. The fatigue crack growth (FCG) in gaseous hydrogen was found to consist of two regimes corresponding to a slightly accelerated regime at relatively low stress intensity factor range, ΔK, (Stage I) and the highly accelerated regime at relatively high ΔK (Stage II). These regimes were manifested by the intergranular and quasi-cleavage types of fractures respectively. Scanning electron microscopy (SEM) observations demonstrated an increase in plastic deformation around the crack wake in the Stage I, but considerably lower amount of plasticity around the crack path in the Stage II. Transmission electron microscopy (TEM) results identified dislocation cell structure immediately beneath the fracture surface of the Stage I sample, and dislocation tangles in the Stage II sample corresponding to fracture at high and low plastic strain amplitudes respectively.
AB - Hydrogen effect on fatigue performance of commercially pure BCC iron has been studied with a combination of various electron microscopy techniques. The fatigue crack growth (FCG) in gaseous hydrogen was found to consist of two regimes corresponding to a slightly accelerated regime at relatively low stress intensity factor range, ΔK, (Stage I) and the highly accelerated regime at relatively high ΔK (Stage II). These regimes were manifested by the intergranular and quasi-cleavage types of fractures respectively. Scanning electron microscopy (SEM) observations demonstrated an increase in plastic deformation around the crack wake in the Stage I, but considerably lower amount of plasticity around the crack path in the Stage II. Transmission electron microscopy (TEM) results identified dislocation cell structure immediately beneath the fracture surface of the Stage I sample, and dislocation tangles in the Stage II sample corresponding to fracture at high and low plastic strain amplitudes respectively.
UR - http://www.scopus.com/inward/record.url?scp=85056823358&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85056823358&partnerID=8YFLogxK
U2 - 10.1115/pvp2018-84783
DO - 10.1115/pvp2018-84783
M3 - Conference contribution
AN - SCOPUS:85056823358
T3 - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
BT - Materials and Fabrication
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2018 Pressure Vessels and Piping Conference, PVP 2018
Y2 - 15 July 2018 through 20 July 2018
ER -