Evaluation of the Mechanical Properties of Cast and Wrought CF8C-Plus Relevant to ASME Code Case Qualification

Conference · Tue Oct 01 04:00:00 EDT 2024

DOI:https://doi.org/10.31399/asm.cp.am-epri-2024p0123· OSTI ID:2472704

Chen, Xiang ^[1]; Tortorelli, Peter ^[1]; Santella, Michael L. ^[1]; Pint, Bruce ^[1]; Wang, Hong ^[1]; Maziasz, Philip J. ^[2]; Sutton, Benjamin J. ^[3]; Purdy, Daniel ^[3]

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1. ORNL
2. Independent Decision Consultant
3. Electric Power Research Institute (EPRI)

The mechanical behavior of a cast form of an advanced austenitic stainless steel, CF8C-Plus, is compared with that of its wrought equivalent in terms of both tensile and creep-rupture properties and estimated allowable stress values for pressurized service at temperatures up to about 850°C. A traditional Larson-Miller parametric model is used to analyze the creep-rupture data and to predict long-term lifetimes for comparison of the two alloy types. The cast CF8C-Plus exhibited lower yield and tensile strengths, but higher creep strength compared to its wrought counterpart. Two welding methods, shielded-metal-arc welding (SMAW) and gas-metal-arc welding, met the weld qualification acceptance criteria in ASME BPVC Section IX for the cast CF8C-Plus. However, for the wrought CF8C-Plus, while SMAW and gas-tungsten-arc welding passed the tensile acceptance criteria, they failed the side bend tests due to lack of fusion or weld metal discontinuities.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 2472704
• Country of Publication: United States
• Language: English