Development and performance of INCONEL® alloy 740H® seam-welded piping

Shingledecker, John; deBarbadillo, John (Jack); Gollihue, Ronnie; Griscom, Eeva; Purdy, Dan; Bridges, Alex

doi:10.1016/j.ijpvp.2022.104875

Development and performance of INCONEL® alloy 740H® seam-welded piping

Journal Article · Fri Dec 23 00:00:00 EST 2022 · International Journal of Pressure Vessels and Piping

DOI:https://doi.org/10.1016/j.ijpvp.2022.104875· OSTI ID:1922146

^[1]; deBarbadillo, John (Jack) ^[2]; Gollihue, Ronnie ^[2]; Griscom, Eeva ^[3]; Purdy, Dan ^[3]; Bridges, Alex ^[3]

Electric Power Research Institute (EPRI), Charlotte, NC (United States); EPRI
Special Metals Corporation, Huntington, WV (United States)
Electric Power Research Institute (EPRI), Charlotte, NC (United States)

INCONEL® alloy 740H® is an age-hardenable nickel-based alloy approved for pressure vessels and piping within ASME Section I, VIII, and B31.1. Currently, the code applies a weld strength reduction factor (WSRF) of 0.7 to the allowable stresses for longitudinal seam welds in the time dependent creep regime. In this work, a full-scale seam weld was successfully produced using typical industrial practices. The component was solution heat-treated and aged after fabrication to improve the performance of the weldment. Tensile, bend, impact, and low-cycle fatigue tests showed the component met all the specification requirements and elevated temperature properties were within base metal expectations with failures predominately in the weld metal. Long-term creep tests, including large samples more representative of the entire weldment, were fabricated and tested to times in excess of 10,000 h at multiple temperatures. Analysis of the creep data supports a WSRF of 0.9 for the solution annealed + aged weldments in contrast to the WSRF of 0.7 currently applied to welded + aged weldments. Metallurgical analysis shows that the solution annealing causes recrystallization of the weld metal and reduces the chemical compositional and microstructural gradients in the weldments resulting in acceptable short-term performance. In long-term creep, evidence for coarsened zones in the weldments due to discontinuous coarsening reactions were identified as the mechanism leading to accelerated creep damage formation in the weld metal and sample failure.

View Accepted Manuscript (DOE)

Research Organization:: Electric Power Research Institute (EPRI), Charlotte, NC (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: EE0008367

OSTI ID:: 1922146

Journal Information:: International Journal of Pressure Vessels and Piping, Journal Name: International Journal of Pressure Vessels and Piping Vol. 202; ISSN 0308-0161

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (14)

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14 SOLAR ENERGY
36 MATERIALS SCIENCE
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