Crack propagation analysis of hydrogen embrittlement based on peridynamics

2021 ◽  
Author(s):  
Xiu Ran ◽  
Songrong Qian ◽  
Ji Zhou ◽  
Zhengyun Xu
Keyword(s):  
Hydrogen Embrittlement ◽  
Crack Propagation ◽  
Propagation Analysis

Fatigue crack propagation analysis for multiple weld toe cracks in cut-out fatigue test specimens from a girth welded pipe

2017 ◽  
Vol 94 ◽  
pp. 158-165 ◽  
Author(s):  
John H.L. Pang ◽  
Hsin Jen Hoh ◽  
Kin Shun Tsang ◽  
Jason Low ◽  
Shawn Caleb Kong ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Test ◽  
Fatigue Crack Propagation ◽  
Propagation Analysis ◽  
Weld Toe ◽  
Welded Pipe

scholarly journals Analysis of Stress Corrosion Cracking Propagation of SS304 Stainless Steel Using Crack Shape and Etch Pits

2020 ◽  
Vol 58 (9) ◽  
pp. 583-589
Author(s):  
Byung Hak Choe ◽  
Sang Woo Lee ◽  
Jong Kee Ahn ◽  
Jinhee Lee
Keyword(s):  
Stainless Steel ◽  
Phase Transformation ◽  
Hydrogen Embrittlement ◽  
Crack Propagation ◽  
Stress Corrosion ◽  
High Hardness ◽  
Face Centered Cubic ◽  
High Concentration ◽  
Etch Pits ◽  
Tem Analysis

Austenitic stainless steel SS304 is vulnerable to Cl atmosphere SCC (stress corrosion crack). In this study, SCC phenomena related to stress and corrosion composition were analyzed to identify the mechanism for SCC initiation and propagation in SS304. The microstructure and mechanical properties resulting from crack propagation were analyzed by OM, SEM/EDS and micro Vickers hardness tests. The abnormal phase transformation induced by the SCC was analyzed by TEM and diffraction. As a result of these analyses, the shape of SCC was observed to form a branched type crack, which was related to etch pit patterns on the etched surface due to the austenitic fcc (face centered cubic) lattice slip. In addition, the high concentration accumulation of Cl and S components at the SCC site, observed by SEM/EDS, indicated that the SCC was affected by the corrosive atmosphere. The SCC crack propagation was accompanied by hardening, which is believed to be associated with the mechanism of hydrogen embrittlement. High resolution TEM analysis found abnormal satellite diffraction points in the SCC high hardness region. This means that a superlattice phase with high hardness values is formed near the SCC region. And the HIC (hydrogen induced crack) effect, a kind of hydrogen embrittlement, was also influenced by the hardened superlattice phase. It is assumed that the SCC and HIC are similar phenomena produced in the same stress and corrosive atmosphere by superlattice phase transformation.

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