Effect of Long-Term Operation on the Physical and Mechanical Properties and the Fracture Mechanisms of X70 Pipeline Steels

被引：2

作者：

Demina, Yu. A. ^{[1
]}

Tyutin, M. R. ^{[1
]}

Marchenkov, A. Yu. ^{[2
]}

Levin, V. P. ^{[1
,3
]}

Botvina, L. R. ^{[1
]}

机构：

[1] Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119334, Russia

[2] Natl Res Univ Moscow Power Engn Inst MPEI, Moscow 111250, Russia

[3] Bauman Moscow State Tech Univ, Moscow 105005, Russia

来源：

RUSSIAN METALLURGY | 2022年 / 2022卷 / 04期

关键词：

pipeline steels; mechanical properties; impact toughness; material degradation; fractographic analysis; acoustic emission; residual magnetic field intensity; DEGRADATION; TOUGHNESS; HYDROGEN; FEATURES; GAS;

D O I：

10.1134/S0036029522040127

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The mechanical and physical properties of X70 pipeline steels produced in France and Japan are comprehensively studied using tensile and impact bending tests, analysis of the fracture reliefs of specimens, and the estimation of acoustic emission parameters, the attenuation coefficient of longitudinal ultrasonic waves, and the residual magnetic field intensity. A correlation between the mechanical and physical characteristics during tensile tests is revealed. After long-term operation, the yield strength and the ultimate tensile strength are shown to decrease and the plasticity and impact characteristics are shown to increase in comparison with the initial values from pipelines sertificates for both studied steels. The predominant mechanism of these changes is associated with the presence of a large number of delaminations, which cause fracture energy dissipation and hide the true picture of changes in the estimated strength characteristics.

引用

页码：452 / 462

页数：11

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