Mechanical Properties of X70 Welded Joint in High-Pressure Natural Gas/Hydrogen Mixtures

被引：7
作者：
Gai Huang
Jinyang Zheng
Bo Meng
Zhengli Hua
Qunjie Lu
Xiongying Li
Ping Xu
机构：
[1] Zhejiang University,Institute of Process Equipment
[2] Zhejiang University,State Key Laboratory of Fluid Power and Mechatronics Systems
[3] Zhejiang University,Engineering Research Centre for High Pressure Process Equipment and Safety, Ministry of Education
[4] Zhejiang University,Institute of Applied Mechanics
来源：
Journal of Materials Engineering and Performance | 2020年 / 29卷
关键词：
fatigue life; hydrogen embrittlement; mechanical properties; natural gas/hydrogen mixture; X70 welded joint;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The effect of hydrogen on the mechanical properties of X70 welded joint was investigated in simulated natural gas/hydrogen mixtures at 10 MPa. The hydrogen volume fraction was set as 0, 5.0 and 10.0 vol.%. The slow strain rate tensile test showed that the reduction in the area of the welded zone (WZ) metal was reduced more than that of the base metal. The variation in fatigue crack growth rate (FCGR) from high to low followed the order: heat-affected zone (HAZ) metal, base metal and WZ metal. In addition, the difference became more obvious with increasing hydrogen volume fraction. For the HAZ metal, the FCGR in 10.0 vol.% hydrogen mixtures was approximately 22 times of that in nitrogen. Furthermore, based on FCGR and fracture mechanics, the predicted fatigue life of the X70 pipeline with an initial flaw depth of 0.5 mm dropped sharply from 34,302 cycles to 3457 cycles even though 5.0 vol.% hydrogen was added in the simulated natural gas.
引用
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页码：1589 / 1599
页数：10
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