Effect of bainitic microstructure on hydrogen trapping in a low carbon micro-alloyed pipeline steel

被引：1

作者：

Sun, Lu ^{[1
]}

Li, Meifeng ^{[1
]}

Gaudet, Michael ^{[2
]}

Fazeli, Fateh ^{[3
]}

Wiskel, J. Barry ^{[1
]}

Liu, Jing ^{[1
]}

Chen, Weixing ^{[1
]}

Henein, Hani ^{[1
]}

机构：

[1] Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB, Canada

[2] EVRAZ Inc, Regina, SK, Canada

[3] CanmetMATERIALS, Hamilton, ON, Canada

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2025年 / 136卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Hydrogen traps; High angle grain boundary; Lower bainite; Upper bainite; AUSTENITE GRAIN-SIZE; INDUCED CRACKING BEHAVIOR; TIC PARTICLES; MORPHOLOGY; DIFFUSION; PERMEATION; INCLUSIONS; EFFICIENCY; IRON; SUSCEPTIBILITY;

D O I：

10.1016/j.ijhydene.2024.06.006

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The present study investigates the effect of upper and lower bainite with different morphologies on hydrogen trapping in low carbon micro-alloyed pipeline steel. Seven rough rolled steel samples (with different number of rolling passes and cooling process) were produced using a pilot scale rolling mill. Each sample was subjected to double-cell electrochemical hydrogen permeation test to determine the effective hydrogen diffusion coefficient (Deff) and the hydrogen trapping density (Nt). The prior austenite grain size (PAG) and misorientation distribution/bainite lath morphology were measured using optical microscopy (OM) and electron backscattered diffraction (EBSD) respectively. In addition, transmission electron microscopy (TEM) in combination with electron diffraction spectroscopy (EDS) analysis was employed to qualitatively determine the composition of the (Nb, Ti)/(C, N) precipitates. A correlation between PAG size and bainite morphology (length and thickness of individual lower bainite sheaves and block/packets) was observed with longer and thinner bainite (lower bainite) associated with larger PAG. These block/packets boundaries act as irreversible traps. Upper bainite exhibited a stronger irreversible trapping capability but displayed a comparatively weaker reversible trapping ability compared to lower bainite.

引用

页码：702 / 712

页数：11

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