Influence of long-term operation on structure, fatigue durability and impact toughness of 09Mn2Si pipe steel

被引：1
|
作者：
Panin, S. V. [1 ,2 ]
Vlasov, I. V. [1 ,2 ]
Marushchak, P. O. [3 ]
Eremin, A. V. [1 ,2 ]
Byakov, A. V. [1 ,2 ]
Berto, F. [4 ]
Vinogradov, A. Yu. [4 ]
Syromyatnikova, A. S. [5 ,6 ]
Stankevich, R. [2 ]
机构：
[1] RAS, Inst Strength Phys & Mat Sci SB, 2-4 Pr Akad Skii, Tomsk 634055, Russia
[2] Natl Res Tomsk Polytech Univ, 30 Lenin Ave, Tomsk 634050, Russia
[3] Ternopil Ivan Puluj Natl Tech Univ, 56 Ruska Str Ternopil, Ternopol 46001, Ukraine
[4] Norwegian Univ Sci & Technol, Richard Birkelands Vei 2B, N-7491 Trondheim, Norway
[5] North Eastern Fed Univ, 58 Belinsky Str, Yakutsk 677027, Russia
[6] RAS, VP Larionov Inst Phys & Tech Problems North SB, 1 Oktyabr Skaya Str, Yakutsk 677980, Russia
来源：
2ND INTERNATIONAL CONFERENCE ON STRUCTURAL INTEGRITY, ICSI 2017 | 2017年 / 5卷
关键词：
pipe steel 09Mn2Si; long-term operation; microstructure degradation; embrittlement; impact toughness; fatigue durability; IN-SERVICE DEGRADATION; GAS; PIPELINES;
D O I：
10.1016/j.prostr.2017.07.188
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
A comprehensive study of the structure, mechanical properties including impact toughness of 09Mn2Si steel used for constructing main gas pipeline "Mastakh-Berge-Yakutsk" after 37 years of operation was carried out. A comparative analysis of the results obtained for the emergency stock steel was conducted. It is shown that long-term operation does not give rise to a substantial redistribution of cementite. Deformation aging is slightly expressed and is manifested through the precipitation of finely dispersed carbides in the grain bulk. The revealed structure degradation does not practically make sense under static tension or hardness measurement. At the same time, under cyclic testing the microstructure degradation being occurred during long-term operation results in fatigue lifetime decrease especially at the stage of crack initiation. The most pronounced manifestation of structure changes is related to decreasing impact toughness of 09Mn2Si steel which reaches 2 times under negative temperatures. The reasons and mechanisms of the observed phenomena are discussed. (C) 2017 The Authors. Published by Elsevier B.V.
引用
收藏
页码：401 / 408
页数：8
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