Creep Performance and Microstructural Characterization of Electron-Beam Welded 316LN SS-Grade 91 Steel Dissimilar Joint

Vanaja, J.; Dey, H. C.; Reddy, G.V. Prasad; Laha, K.; Vasudevan, M.

doi:10.1007/s11661-023-07074-0

Cited by 3 publications

(2 citation statements)

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“…Generally, this type of failure mode is mainly related to the lack of precipitate pinning at grain boundaries, coarsening of precipitates, and structural constraints due to lower hardness [38,39]. Vanaja et al [13] also reported Type IV failure in the inter-critical HAZ of Grade 91 steel in an electron-beam-welded DMW after long-term creep exposure. Kumar et al [9] identified the fine-grained HAZ as the weakest region in terms of creep strength in a laser-beam-welded IN617/304L DMW joint.…”

Section: Failure Analysis Of V-groove Jointsmentioning

confidence: 99%

“…Recent studies have focused on the effects of the welding process [9], filler metal [10,11], and post-weld heat treatment [10,12] on the microstructure evolution and mechanical properties of DMWs. Vanaja et al [13] investigated the creep rupture behavior of a DMW between 316LN stainless steel and Grade 91 steel fabricated by an electron beam. They found that the failure location shifted from the base metal to the inter-critical HAZ of Grade 91 steel after long-term creep exposure, but the weld interface exhibited good stability.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Groove Geometry on the Creep Fracture Behavior of Dissimilar Metal Welds between Ferritic Heat-Resistant Steels and Nickel-Based Alloys

Zhang,

Liu,

et al. 2024

Metals

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This study investigates the influence of groove geometry on the high-temperature creep life and fracture behavior of Dissimilar Metal Welds (DMWs) between low-alloy steel 2.25Cr1Mo and austenitic stainless steel 347H using Inconel 82 nickel-based filling metal. This research aims to reveal the effect of groove geometry, especially the stepped groove, on creep crack propagation path and creep life, through a combined approach of finite element simulation considering stress triaxiality and experimental validation. The study reveals that the stepped groove alters the creep crack propagation path, enhancing the endurance life by deflecting cracks away from the weld/heat-affected zone (HAZ) interface and directing them into regions with higher creep resistance. The experimental results verify the simulation findings, revealing that the stepped groove joints exhibited longer creep life with changes in failure location and mechanism compared to the V-groove joints. However, it was found that the stepped groove intensified the stress concentration at the early creep stage. Thus, a good balance should be achieved between the negative (stress concentration at interface) and positive (changing crack paths) effects of the stepped groove to extend the creep life of DMWs.

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