The Initiation of Long-Term Creep Rupture Tests on the First Alloy 709 Commercial Heat

Creep, Fatigue, and Creep-Fatigue Testing of Alloy 709 Base Metal at ORNL (FY 2021)

“…The test effort for the comprehensive creep test matrix developed to support the preliminary, 100,000 h, 300,000 h, and 500,000 h Alloy 709 Code Cases was split among ANL, INL, and ORNL. In FY 2018, long-term creep tests were initiated at ORNL for plates produced by AOD SA at 1100C with test temperatures from 550 to 800C and stresses of 38 to 309 MPa, to a target rupture time of 60,000 h (Wang et al 2018). In FY 2019, ESR with SA at 1100C was added to the intermediate and long-term testing effort (Wang and Sham 2019).…”

Report on FY 2020 testing of Alloy 709 in support of EPP analysis

“…Major testing tasks per ASME Section III, Division 5, Subsection HB, subpart B (ASME 2019a)also include the development of temperaturedependent fatigue design curves and creep-fatigue (CF) damage interaction diagrams. Code Case testing on the Carlson heat Alloy 709 is ongoing at ORNL (Wang et al 2018, Wang and Sham 2019, Wang et al 2020a. Completion of the Alloy 709 CC will allow US reactor vendors to decrease capital costs, expand design envelopes, and increase safety margins in the deployment of SFRs and other reactor concepts.…”

Planned FY19 Creep and Fatigue Design Curve Testing of Alloy 709 Base Metal

“…Both AOD with S/A at 1100°C and ESR with S/A at 1100°C showed good microstructure and combined hightemperature mechanical properties (McMurtrey 2018). In FY 2018, long-term creep tests were initiated at ORNL for plates produced by AOD with S/A at 1100°C under six different test conditions, at temperatures of 550 to 800°C and stresses of 38 to 309 MPa, to a target rupture time of 60,000 h. This activity is documented inWang et al 2018. The test effort for the comprehensive creep test matrix developed to support the preliminary, 100,000 hr, 3000,000 hr and 500,000 hr Alloy 709 Code Cases was split among ANL, INL and ORNL. ESR with S/A 1100 o C was added to the intermediate and long-term testing effort in FY 2019.…”

“…The remaining four tests were delayed by specimen machining and will be carried out when additional creep specimens are machined and delivered.The six long-term creep tests initiated in FY 2018 are listed in Table4. The details of these tests are documented inWang et al 2018. These tests are ongoing, with accumulated creep time of approximately 8,000 h for each test as of September 1, 2019.…”