TY - JOUR
T1 - Fatigue life assessment of low carbon API 5L X52 pipeline steels retired from long-term service
AU - Beltrán-Zúñiga, M. A.
AU - Rivas-López, D. I.
AU - Dorantes-Rosales, H. J.
AU - González-Zapatero, W.
AU - Ferreira-Palma, C.
AU - López-Hirata, V. M.
AU - Hernández-Santiago, F.
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/1
Y1 - 2023/1
N2 - The fatigue lifetime of two API 5L X52 steels retired from long-term service was investigated. Both steels presented pearlite fragmentation, fine precipitate particles and spheroidized cementite at the grain boundaries, which is associated to microstructural degradation due to natural aging. Neither tensile strength nor hardness properties have significant variations respect to the design specifications; however, lower ductility was observed in the most degraded steel. Fatigue characterization was carried out by axial force-controlled tests, finding that the fatigue life is 77 % lower in the steel with the lowest ductility and highest microstructural degradation. Results indicate that the fatigue lifetime of a ferrite-pearlite microstructure is more affected by the microstructural degradation due to long-term service of the steel, in spite of traditional considerations as non-metallic inclusion or grain size. Hence, the natural aging effect is a main factor to be considered in the fatigue life of long-term exposure low carbon steels.
AB - The fatigue lifetime of two API 5L X52 steels retired from long-term service was investigated. Both steels presented pearlite fragmentation, fine precipitate particles and spheroidized cementite at the grain boundaries, which is associated to microstructural degradation due to natural aging. Neither tensile strength nor hardness properties have significant variations respect to the design specifications; however, lower ductility was observed in the most degraded steel. Fatigue characterization was carried out by axial force-controlled tests, finding that the fatigue life is 77 % lower in the steel with the lowest ductility and highest microstructural degradation. Results indicate that the fatigue lifetime of a ferrite-pearlite microstructure is more affected by the microstructural degradation due to long-term service of the steel, in spite of traditional considerations as non-metallic inclusion or grain size. Hence, the natural aging effect is a main factor to be considered in the fatigue life of long-term exposure low carbon steels.
KW - Fatigue lifetime
KW - Long-term service
KW - Mechanical properties
KW - Natural aging
KW - Pipeline steel
UR - http://www.scopus.com/inward/record.url?scp=85140750042&partnerID=8YFLogxK
U2 - 10.1016/j.engfailanal.2022.106769
DO - 10.1016/j.engfailanal.2022.106769
M3 - Artículo
AN - SCOPUS:85140750042
SN - 1350-6307
VL - 143
JO - Engineering Failure Analysis
JF - Engineering Failure Analysis
M1 - 106769
ER -