Evaluation of tensile properties of various regions of creep exposed dissimilar weld joint using miniature specimen testing. (February 2021)

• Record Type: Journal Article
• Authors: Awale, Deepshree D.; Vijayanand, V.D.; Ballal, Atul R.; Thawre, Manjusha M.; Ganesh Kumar, J.; Prasad Reddy, G.V.
• Is Part Of: Engineering failure analysis. Volume 120(2021)
• Publication Date: 2021-02
• Subjects: Dissimilar weld joint -- Creep failure -- Automated ball indentation -- Tensile properties; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2020.105079
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlights: Strength gradient evaluated using Automated ball indentation miniaturised testing. Carried on dissimilar weld joint specimen after creep exposure at 550 °C/200 MPa. Tensile properties were analysed at various constituent regions of the weld joint. Results show degradation of strength on P91 steel HAZ and strengthening on 316LN SS side, after creep exposure. Abstract: Strength variations in various regions of a dissimilar weld joint made between 316LN stainless steel (SS) and P91 steel after creep exposure at 550 °C and stress of 200 MPa was estimated using automated ball indentation (ABI) test. The ABI results were used to derive equivalent uniaxial tensile flow behaviour using established correlation factors. A comparison of the results obtained in the creep tested and post weld heat treated (PWHT) samples showed loss of strength in the P91 steel side. It was observed that, creep exposure under this testing condition strengthened the 316LN SS side of the weld joint. ABI derived results showed that, the inter critical-heat affected zone (IC-HAZ) of P91 steel is the weakest region across the weld after creep exposure. The narrow IC-HAZ created a strain constraint which caused the specimen to fail in the P91 steel base metal region.