Abstract
The microstructure and mechanical properties of 09Mn2Si steel used for the transmission natural gas pipeline “Mastakh-Berge-Yakutsk” have been investigated comprehensively after 37 years of operation. The results obtained for the specimens cut from the pipe were compared to those obtained using the preserved (reference) specimens. It is demonstrated that long-term operation in harsh climate does change the pearlitic microstructure appreciably. The strain aging however can be noticed through precipitation of finely dispersed carbides in the grain interior. The latter causes some embrittlement of the steel measured under impact loading. Revealed microstructural changes are not practically important for “quasi-static” tension or hardness properties. Nonetheless, under cyclic testing the microstructure degradation, which occurred during long-term operation, results in a considerable reduction of fatigue life, which is particularly pronounced during the crack initiation stage. The microstructure degradation is most clearly seen in sharply reduced impact toughness which dropped by a factor of two at temperatures below zero Centigrade. Reasons and mechanisms of the observed phenomena are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 87-101 |
| Number of pages | 15 |
| Journal | Engineering Failure Analysis |
| Volume | 102 |
| DOIs | |
| Publication status | Published - 1 Aug 2019 |
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Keywords
- Fatigue assessment
- Hydrogen embrittlement
- Impact toughness
- Pipeline steel
- Structure degradation
ASJC Scopus subject areas
- Materials Science(all)
- Engineering(all)
Cite this
Influence of long-term cold climate operation on structure, fatigue durability and impact toughness of 09Mn2Si pipe steel. / Panin, S. V.; Vlasov, I. V.; Maruschak, P. O.; Eremin, A. V.; Berto, F.; Syromyatnikova, A. S.; Vinogradov, A.
In: Engineering Failure Analysis, Vol. 102, 01.08.2019, p. 87-101.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of long-term cold climate operation on structure, fatigue durability and impact toughness of 09Mn2Si pipe steel
AU - Panin, S. V.
AU - Vlasov, I. V.
AU - Maruschak, P. O.
AU - Eremin, A. V.
AU - Berto, F.
AU - Syromyatnikova, A. S.
AU - Vinogradov, A.
PY - 2019/8/1
Y1 - 2019/8/1
N2 - The microstructure and mechanical properties of 09Mn2Si steel used for the transmission natural gas pipeline “Mastakh-Berge-Yakutsk” have been investigated comprehensively after 37 years of operation. The results obtained for the specimens cut from the pipe were compared to those obtained using the preserved (reference) specimens. It is demonstrated that long-term operation in harsh climate does change the pearlitic microstructure appreciably. The strain aging however can be noticed through precipitation of finely dispersed carbides in the grain interior. The latter causes some embrittlement of the steel measured under impact loading. Revealed microstructural changes are not practically important for “quasi-static” tension or hardness properties. Nonetheless, under cyclic testing the microstructure degradation, which occurred during long-term operation, results in a considerable reduction of fatigue life, which is particularly pronounced during the crack initiation stage. The microstructure degradation is most clearly seen in sharply reduced impact toughness which dropped by a factor of two at temperatures below zero Centigrade. Reasons and mechanisms of the observed phenomena are discussed.
AB - The microstructure and mechanical properties of 09Mn2Si steel used for the transmission natural gas pipeline “Mastakh-Berge-Yakutsk” have been investigated comprehensively after 37 years of operation. The results obtained for the specimens cut from the pipe were compared to those obtained using the preserved (reference) specimens. It is demonstrated that long-term operation in harsh climate does change the pearlitic microstructure appreciably. The strain aging however can be noticed through precipitation of finely dispersed carbides in the grain interior. The latter causes some embrittlement of the steel measured under impact loading. Revealed microstructural changes are not practically important for “quasi-static” tension or hardness properties. Nonetheless, under cyclic testing the microstructure degradation, which occurred during long-term operation, results in a considerable reduction of fatigue life, which is particularly pronounced during the crack initiation stage. The microstructure degradation is most clearly seen in sharply reduced impact toughness which dropped by a factor of two at temperatures below zero Centigrade. Reasons and mechanisms of the observed phenomena are discussed.
KW - Fatigue assessment
KW - Hydrogen embrittlement
KW - Impact toughness
KW - Pipeline steel
KW - Structure degradation
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UR - http://www.scopus.com/inward/citedby.url?scp=85064318874&partnerID=8YFLogxK
U2 - 10.1016/j.engfailanal.2019.04.036
DO - 10.1016/j.engfailanal.2019.04.036
M3 - Article
VL - 102
SP - 87
EP - 101
JO - Engineering Failure Analysis
JF - Engineering Failure Analysis
SN - 1350-6307
ER -