Creep–fatigue-oxidation interaction in Grade 91 steel weld joints for high temperature applications

► Martensitic lath structure rearranges into cells/subgrains causing cyclic softening. ► Cyclic softening process is highly sensitive to temperature and application of hold. ► Lower CSR of weld joint compared to base metal due to soft zone in the HAZ. ► Failure location of WJ depends upon temperatur...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-11, Vol.528 (29), p.8428-8437
Main Authors: Shankar, Vani, Sandhya, R., Mathew, M.D.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Creep–fatigue interaction
Dwell
Exact sciences and technology
Fatigue
Fatigue failure
Fatigue life
Fractures
Grade 91 steel weld joint
Heat affected zone
Joining, thermal cutting: metallurgical aspects
Low cycle fatigue
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Oxidation
Structural materials
Type IV cracking
Welded joints
Welding
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Summary:► Martensitic lath structure rearranges into cells/subgrains causing cyclic softening. ► Cyclic softening process is highly sensitive to temperature and application of hold. ► Lower CSR of weld joint compared to base metal due to soft zone in the HAZ. ► Failure location of WJ depends upon temperature and direction of hold application. ► Enhanced cracking due to strain localization and creep cavity formation in HAZ. ► Compression dwell sensitivity due to the deleterious effect of the surface oxides. The weld joint consisting of a heterogeneous microstructure exhibits a lower fatigue life than that of the base metal. This is due to the presence of soft zone in the heat affected zone (HAZ). At high temperatures and under hold application, strain localization occurs in the soft intercritical HAZ (ICHAZ). Sub-surface creep cavity formation in the soft region and their linkage causes enhanced crack propagation and that translates into lower fatigue life of the weld joint at high temperatures. Occurrence of compression dwell sensitivity in the material is attributed to the presence of surface oxides.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2011.07.046