Effect of microfissures on mechanical properties of 308L austenitic stainless steel weld metals

Microfissures occur primarily in ferrite-free areas along grain boundaries in the weld HAZ of a previous weld pass and the occurrence is enhanced by multiple thermal cycling of the HAZ. In addition, a low ductility region exists in the weld metal of previously deposited weld pass from multipass depo...

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Bibliographic Details
Published in:Journal of materials science 2005-03, Vol.40 (5), p.1281-1283
Main Authors: CUT, Y, LUNDIN, Carl D
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steels
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Joining
welding
Materials science
Materials synthesis
materials processing
Mechanical properties
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals, semimetals and alloys
Metals. Metallurgy
Other mechanical properties
Physics
Specific materials
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Summary:Microfissures occur primarily in ferrite-free areas along grain boundaries in the weld HAZ of a previous weld pass and the occurrence is enhanced by multiple thermal cycling of the HAZ. In addition, a low ductility region exists in the weld metal of previously deposited weld pass from multipass deposits or from repair welding. This region is usually the initial location for microfissuring occurrence when a weld exhibits a low ferrite number (FN), while under a high imposed strain that exceeds the strain tolerance of the microstructure. Furthermore, delta ferrite of a certain level has a beneficial effect in reducing or preventing microfissuring in austenitic stainless steel weldments. This level of ferrite was firmly established by Lundin, DeLong, and Spond in an article documenting the ferrite-fissuring tendency of austenitic stainless steel weld metals. In this letter, we describe the effect of microfissures on mechanical properties of 308L austenitic stainless steel weld metals.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-6952-y