J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (6): 1081-1087.DOI: 10.1016/j.jmst.2018.12.019
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Yuefeng Jiangab, Bo Zhanga*(), Dongying Wangc, Yu Zhoua, Jianqiu Wanga, En-Hou Hana, Wei Keaa
Received:
2018-08-30
Revised:
2018-11-14
Accepted:
2018-11-30
Online:
2019-06-20
Published:
2019-06-19
Contact:
Zhang Bo
About author:
1 These authors contributed equally to this work.
Yuefeng Jiang, Bo Zhang, Dongying Wang, Yu Zhou, Jianqiu Wang, En-Hou Han, Wei Kea. Hydrogen-assisted fracture features of a high strength ferrite-pearlite steel[J]. J. Mater. Sci. Technol., 2019, 35(6): 1081-1087.
Fig. 1. Typical microstructure micrographs of FP steel showing ferrite and pearlite structure: (a) SEM micrograph of ferrite (dark) and pearlite (bright), (b) SEM micrograph of pearlite colony with lamellar F/C interfaces, (c) TEM micrograph of F/P boundary with several intersections between F/C interface and F/P boundary and (d) TEM micrograph of two pearlite colonies with different orientations.
Fig. 3. Measurement of the hydrogen desorption activation energy: (a) a typical hydrogen desorption curve of the FP steel with heating rate of 100 °C/h, and (b) the plots of $ln(\emptyset/T_{p}^{2})$ versus 1/Tp for the two hydrogen desorption peaks.
Fig. 4. Typical SSRT curves for FP steels at a constant strain rate of 1 × 10-5s-1 at 298 K in the air and in hydrogen charging environment at current density of 10 mA/cm2.
Fig. 5. SEM images of the cracking FP steel after SSRT: (a) fracture surface center of the uncharged sample with numerous dimples, (b) the edge of fracture surface of the hydrogen charged samples showing a mixed fracture mode with IG and QC feature, (c) subcracks observation showing hydrogen induced crack nucleation (a microcrack) at pearlite colony boundary, F/P boundary and the adjacent ferrite matrix with IG and QC feature, and (d) QC fracture mode with some “featureless” flat regions in the center of fracture surface.
Fig. 6. TEM observations of the microstructure beneath the QC fracture surface. (a) the specific site for TEM foils with three tear ridges, (b) bright-field image and corresponding SAED pattern of one tear ridge with Pt layer, and (c) EDX elemental mapping of C.
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