Mechanism-informed 3D analysis of fracture surfaces in hydrogen-charged line pipe steels
Year: 2025
Type: article
Abstract: Hydrogen embrittlement (HE) poses a critical threat to the structural integrity of pipeline steels in hydrogen-rich environments. This study presents a mechanism-informed, quantitative analysis of fracture surfaces in hydrogen-charged API 5L X65 steel using three-dimensional (3D) optical profilometry for quantitatively assessing and apprehending the susceptibility of steels to HE under different conditions. Steel specimens charged for 0-8 hours were evaluated via slow strain rate tensile (SSRT) testing, SEM, and high-resolution 3D surface scanning. Three geometric parameters, total flat surface area, mean flat patch area, and maximum flat patch area, were introduced to quantify fracture morphology. A steady increase in total flat area and a sharp rise in mean and maximum patch areas at 8 hours marked a transition from ductile to quasi-cleavage fracture. These metrics reliably captured HELP- and HEDE-associated transitions, offering a reproducible and mechanism-sensitive framework for assessing hydrogen-induced damage in steels.
Source: Engineering Failure Analysis
Authors: Jingsi Jiao, Peng Zhang, Mike Yongjun Tan
Institution: Deakin University
Language: English
Subfield: Metals and Alloys
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,820
OpenAlex ID: W4416868017