Effect of Electrochemical Charging Time on Mechanical Property, Fracture Toughness of X100 Pipeline Steel Based on Acoustic Emission Monitoring

doi:10.3901/JME.2019.20.160

Abstract

Abstract: Taking API X100 pipeline steel as the research object, the effects of different electrochemical hydrogen charging time on the mechanical properties and fracture toughness of pipeline steel are studied by electrochemical experiments and acoustic emission monitoring. The mechanism between hydrogen charging time and X100 pipeline steel is explored based on the micro-morphology. The results show that pipeline steel itself has good strength and toughness, when hydrogen is electrochemically introduced, the yield strength and tensile strength of the material will decrease, and the performance deterioration will intensify with the increase of hydrogen charging time. After hydrogen charging, the deterioration of material properties is mainly attributed to the diffusion of hydrogen into the stress concentration defects, which interact with the defect structure and ultimately lead to the change of material properties. These factor scan provide some reference for safe service of high strength low alloy steel.

Key words: X100 pipeline steel, hydrogen charging, acoustic emission, strength and toughness

CLC Number:

TB333

LI Xiaowei, XU Lianyong, HAN Yongdian. Effect of Electrochemical Charging Time on Mechanical Property, Fracture Toughness of X100 Pipeline Steel Based on Acoustic Emission Monitoring[J]. Journal of Mechanical Engineering, 2019, 55(20): 160-167.

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