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2023 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 886, article id 145671Article in journal (Refereed) Published
Abstract [en]
This paper investigated the microstructure and fatigue behavior of PM-HIPed Inconel 625. The microstructure was composed of γ phase and (Mo, Nb) carbonitrides located mostly on prior particle boundaries. Despite the presence of these carbonitrides, the samples showed good tensile properties with high elongation. Two different surface conditions, pickled and machined, were used for high cycle fatigue testing under a four-point bending test. The results indicated that pickled samples had 6% lower fatigue strength (at 106 cycles) with three times higher standard deviation compared to the machined ones. Fatigue failure mechanisms were found to be dependent on surface conditions and showed different failure modes due to non-metallic oxide inclusions and surface defects in samples with machined and pickled surfaces, respectively. The effect of type, size, and location of defects, multiplicity of crack initiations, as well as surface roughness were analyzed and discussed.
Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Fatigue properties, Inconel 625, Mechanical properties, Microstructure, Surface roughness, Carbon nitride, Failure (mechanical), Fatigue testing, High-cycle fatigue, Niobium compounds, Surface defects, Fatigue behaviour, Four-point bending test, High cycle fatigue, High cycle fatigue testing, High elongation, Near net shape, Prior particle boundaries, Surface conditions
National Category
Manufacturing, Surface and Joining Technology
Research subject
Materials Engineering; Materials Science
Identifiers
urn:nbn:se:kau:diva-97121 (URN)10.1016/j.msea.2023.145671 (DOI)001080121200001 ()2-s2.0-85171337833 (Scopus ID)
2023-10-202023-10-202024-01-29Bibliographically approved