Microstructural Evolution of INCONEL® Alloy 740H® Fusion Welds During Creep

Bechetti, Daniel H.; DuPont, J. N.; Barbadillo, John J. de; Baker, Brian; Watanabe, Masashi

doi:10.1007/s11661-014-2682-6

Cited by 42 publications

(21 citation statements)

References 50 publications

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“…It will operate at 973 K and 35 MPa, and increase the thermal efficiency to approximately 50% or higher . To ensure the safety under these more severe conditions, the materials used in A‐USC plants are required to have superior creep properties, corrosion and oxidation resistance …”

Section: Introductionmentioning

confidence: 99%

Precipitates and Precipitation Strengthening of Sanicro 25 Welded Joint Base Metal Crept at 973 K

Zhou

Zhu

Liu

et al. 2017

steel research int.

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In order to optimize the creep rupture strength of Sanicro 25 welded joints, the precipitates in Sanicro 25 welded joint base metal are investigated based on the microstructural evolution during creep at 973 K, and the contribution of precipitates to the precipitation strengthening is calculated. The precipitates in the as-received Sanicro 25 welded joint base metal are primary NbCrN and MX, and creep results in the precipitation of secondary NbCrN, Cu-rich particles and M 23 C 6 . Secondary NbCrN is extremely fine and stable during creep. The precipitation strengthening of secondary NbCrN, Cu-rich particles, M 23 C 6 , and MX greatly contributes to the high creep rupture strength of Sanicro 25 welded joints. At least 58% of precipitation strengthening is contributed by secondary NbCrN and 28% is contributed by Cu-rich particles. Secondary NbCrN and Cu-rich particles are the key precipitates in improving the creep rupture strength of Sanicro 25 welded joints.

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Section: Introductionmentioning

confidence: 99%

Precipitates and Precipitation Strengthening of Sanicro 25 Welded Joint Base Metal Crept at 973 K

Zhou

Zhu

Liu

et al. 2017

steel research int.

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“…Inconel 740H is a  strengthened alloy that also forms M 23 C 6, MC, G-phase, and  (Refs. 9, [33][34][35]. This alloy showed high and moderate susceptibility to SRC at 800 and 900C, respectively with the application of both 0.2 and 10% plastic strain - Fig.…”

Section: Microstructural Characterizationmentioning

confidence: 92%

“…sents the six susceptibility parameters from SP 1 to SP 6 for each SRC test, namely, ductility, percentage stress relaxed, increase in hardness at fracture (compared to base metal), failure time, fracture mode and secondary cracks below the fracture. Severity n and Detectability n are, respectively, the severity and detectability values for each SP n as discussed below.…”

Section: A B C Dmentioning

confidence: 99%

“…Thus, the detrimental lamellar precipitate morphology associated with stress relief cracking at 800C in this alloy forms by discontinuous coarsening, and this is consistent with previous studies on this alloy (Refs. 33,35). The presence of coarse grain boundary precipitates that form by discontinuous reactions are known to degrade mechanical properties by promoting premature IG fracture (Refs.…”

Section: Welding Researchmentioning

confidence: 99%

“…The localization of strain along the grain boundary regions can be associated with matrix strengthening and exacerbated by the formation of softened precipitate-free zones (PFZs) along the boundary (Ref. 6). When the local ductility is exhausted along the grain boundary region, the stress is relaxed by cracking (Refs.…”

Section: Introductionmentioning

confidence: 99%

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Stress Relief Cracking Susceptibility in High-Temperature Alloys

Kant¹

2019

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The stress relief cracking (SRC) susceptibility of a range of austenitic and ferritic alloys was tested using Gleeble ® based test procedures. The tests were developed to study the effect of postweld heat treatment (PWHT) temperature and cold working on the SRC susceptibility. Six susceptibility parameters were identified from the test results (ductility, percentage stress relaxed, hardness increase at fracture, failure time, fracture mode, and extent/type of secondary cracks below the fracture). The susceptibility parameters were integrated with concepts of Risk Priority Number (a prioritization tool in 6-Sigma) to develop an SRC susceptibility index. Sensitivity analysis of the methodology was done to ensure its robustness. The ferritic alloys generally showed the highest SRC susceptibility at a PWHT temperature of 600C, while the austenitic alloys were generally most susceptible at 800C. Using the susceptibility index, the SRC tendency of all the alloys was divided into three regions (highly susceptible, moderately susceptible, and resistant). The newly proposed test procedure and SRC susceptibility index provide a robust approach for studying and ranking the SRC susceptibility of engineering alloys. Posttest microstructural characterization of the SRC samples provided insight into the cracking mechanisms. FEBRUARY 2019 / WELDING JOURNAL 29-s https://doi.org/10.29391/2019.98.003

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Weldability and Welding Metallurgy of Haynes 282 Alloy

Caron

2014

8th International Symposium on Superalloy 718 and Derivatives

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Microstructural Evolution of INCONEL® Alloy 740H® Fusion Welds During Creep

Cited by 42 publications

References 50 publications

Precipitates and Precipitation Strengthening of Sanicro 25 Welded Joint Base Metal Crept at 973 K

Precipitates and Precipitation Strengthening of Sanicro 25 Welded Joint Base Metal Crept at 973 K

Stress Relief Cracking Susceptibility in High-Temperature Alloys

Weldability and Welding Metallurgy of Haynes 282 Alloy

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