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Erschienen in: Metallurgical and Materials Transactions A 3/2014

01.03.2014

Effect of Application of Short and Long Holds on Fatigue Life of Modified 9Cr-1Mo Steel Weld Joint

verfasst von: Vani Shankar, K. Mariappan, R. Sandhya, M. D. Mathew, T. Jayakumar

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 3/2014

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Abstract

Modified 9Cr-1Mo steel is a heat-treatable steel and hence the microstructure is temperature sensitive. During welding, the weld joint (WJ) is exposed to various temperatures resulting in a complex heterogeneous microstructure across the weld joint, such as the weld metal, heat-affected zone (HAZ) (consisting of coarse-grained HAZ, fine-grained HAZ, and intercritical HAZ), and the unaffected base metal of varying mechanical properties. The overall creep–fatigue interaction (CFI) response of the WJ is hence due to a complex interplay between various factors such as surface oxides and stress relaxation (SR) occurring in each microstructural zone. It has been demonstrated that SR occurring during application of hold in a CFI cycle is an important parameter that controls fatigue life. Creep–fatigue damage in a cavitation-resistant material such as modified 9Cr-1Mo steel base metal is accommodated in the form of microstructural degradation. However, due to the complex heterogeneous microstructure across the weld joint, SR will be different in different microstructural zones. Hence, the damage is accommodated in the form of preferential coarsening of the substructure, cavity formation around the coarsened carbides, and new surface formation such as cracks in the soft heat-affected zone.

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Metadaten
Titel
Effect of Application of Short and Long Holds on Fatigue Life of Modified 9Cr-1Mo Steel Weld Joint
verfasst von
Vani Shankar
K. Mariappan
R. Sandhya
M. D. Mathew
T. Jayakumar
Publikationsdatum
01.03.2014
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 3/2014
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-013-2108-x

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