Effect of Electrochemical Hydrogen Charging on Blistering and Mechanical Properties Behavior of Q690 Steel

被引：5

作者：

Ma, Heng ^{[1
]}

Tian, Huiyun ^{[2
]}

Wang, Zhongxue ^{[3
]}

He, Kang ^{[1
]}

Wang, Yuexiang ^{[1
]}

Zhang, Qingpu ^{[1
]}

Liu, Deyun ^{[2
]}

Cui, Zhongyu ^{[2
]}

机构：

[1] Yinshan Sect Steel Corp Laiwu Steel Grp Ltd, Jinan 271104, Peoples R China

[2] Ocean Univ China, Sch Mat Sci & Engn, Qingdao 266100, Peoples R China

[3] Shandong Iron & Steel Corp Ltd, Jinan 271104, Peoples R China

来源：

CRYSTALS | 2023年 / 13卷 / 06期

关键词：

low-alloy steel; hydrogen blister; hydrogen-induced cracking; fracture behavior; electrochemical hydrogen; STRESS-CORROSION CRACKING; CALCAREOUS DEPOSITS; EMBRITTLEMENT SUSCEPTIBILITY; X80; STEEL; IRON; STRENGTH; PIPELINE; PERMEATION; INITIATION; FAILURE;

D O I：

10.3390/cryst13060918

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The purpose of this work is to study the effect of charging conditions on hydrogen damage. The effects of electrochemical hydrogen charging current density and time on hydrogen-induced blistering (HIB), cracking behavior, and mechanical properties of Q690 steel are studied by electrochemical hydrogen charging, microstructure observation, and slow strain rate tensile (SSRT) tests. The results show that HIB and internal cracks occur when the Q690 steel is charged at different current densities. The charging conditions have a significant effect on the HIB characteristics of the material and the morphology, number, size, and location of internal cracks. The geometrical parameters of blisters on the surface of Q690 steel are quantitatively evaluated, and deeper cracks are found at higher hydrogen concentrations. At high hydrogen charging current density (50 mA/cm(2)), due to the accumulation of a large number of hydrogen atoms and the precipitation of hydrogen, the active sites on Q690 steel surface increase dramatically, leading to the initiation of a large number of blisters. At this time, high current density is responsible for the initiation of blisters. The relationship between hydrogen charging current density and mechanical properties of Q690 steel is studied, and the change in the fracture morphology is observed. The Q690 steel was damaged and failed due to an internal crack caused by excessive hydrogen pressure. On the other hand, electrochemical hydrogen charging leads to the degradation of mechanical properties and the transition from ductile fracture to brittle fracture.

引用

页数：13

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