Simulated weldments of AISI grade 304 stainless steel having a ferrite content of 4-6% with three levels of nitrogen (0.03, 0.08, and 0.11 wt-%) were prepared using a modified elemental implant technique. From these weldments, subsize Charpy impact specimens were prepared and subjected to aging treatment at different temperatures, 623-748 K, and for different times, 1000-5000 h. Impact toughness curves for these aged samples were generated by testing at various temperatures from 77 K to 300 K. From the impact curves the upper shelf energy (USE) and lower shelf energy (LSE) were determined. It was observed that both USE and LSE decreased with aging time at all temperatures. Nitrogen seems to offer a beneficial effect as far as impact toughness is concerned, as both USE and LSE values increased with increasing nitrogen content. The worst aging conditions were identified as 748 K, 2000 h at the lowest nitrogen level of 0.03 wt-%. An empirical relation connecting the aging temperature, aging time, and nitrogen content to the LSE was developed, which can be used to predict the time for embrittlement at a given nitrogen level and aging temperature. © 2005 Institute of Materials, Minerals and Mining.

Simple item page
dc.contributor.authorNayak, J.
dc.contributor.authorUdupa, K.R.
dc.contributor.authorHebbar, K.R.
dc.contributor.authorNayak, H.V.S.
dc.date.accessioned2026-02-05T11:00:17Z
dc.date.issuedPrediction of embrittlement during aging of nuclear grade AISI 304 stainless steel TIG welds
dc.description.abstract2005
dc.identifier.citationMaterials Science and Technology (United Kingdom), 2005, 21, 10, pp. 1161-1165
dc.identifier.issn2670836
dc.identifier.urihttps://doi.org/10.1179/174328405X47591
dc.identifier.urihttps://idr.nitk.ac.in/handle/123456789/27913
dc.subjectAging of materials
dc.subjectEmbrittlement
dc.subjectFracture toughness
dc.subjectNitrogen
dc.subjectStainless steel
dc.subjectThermal effects
dc.subjectCharpy impact
dc.subjectLower shelf energy (LSE)
dc.subjectSimulated weldments
dc.subjectTIG welds
dc.subjectWelds
dc.titleSimulated weldments of AISI grade 304 stainless steel having a ferrite content of 4-6% with three levels of nitrogen (0.03, 0.08, and 0.11 wt-%) were prepared using a modified elemental implant technique. From these weldments, subsize Charpy impact specimens were prepared and subjected to aging treatment at different temperatures, 623-748 K, and for different times, 1000-5000 h. Impact toughness curves for these aged samples were generated by testing at various temperatures from 77 K to 300 K. From the impact curves the upper shelf energy (USE) and lower shelf energy (LSE) were determined. It was observed that both USE and LSE decreased with aging time at all temperatures. Nitrogen seems to offer a beneficial effect as far as impact toughness is concerned, as both USE and LSE values increased with increasing nitrogen content. The worst aging conditions were identified as 748 K, 2000 h at the lowest nitrogen level of 0.03 wt-%. An empirical relation connecting the aging temperature, aging time, and nitrogen content to the LSE was developed, which can be used to predict the time for embrittlement at a given nitrogen level and aging temperature. © 2005 Institute of Materials, Minerals and Mining.

Files

Collections

Journal Articles