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http://dx.doi.org/10.3795/KSME-A.2014.38.6.655

Evaluation of Tensile Properties of Alloy 690TT Steam Generator Tube at Room Temperature and 343℃  

Eom, Ki Hyeon (Dept. of Nuclear Engineering, Chosun Univ.)
Kim, Jin Weon (Dept. of Nuclear Engineering, Chosun Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.38, no.6, 2014 , pp. 655-662 More about this Journal
Abstract
This study conducted tensile tests on an Alloy 690TT tube at room temperature (RT) and at $343^{\circ}C$ using tube- and ring-type specimens to investigate the stress-strain behavior and tensile properties of a steam generator (SG) tube in the axial and circumferential directions at RT and at the design temperature of a nuclear power plant (NPP). The results of the axial tensile test showed that yield point phenomena appeared at both RT and $343^{\circ}C$, and serrated flow in the stress-strain curve appeared at $343^{\circ}C$. Yield and tensile strengths for both directions were clearly lower at $343^{\circ}C$ compared to RT; however, the elongations were approximately the same at both test temperatures. Regardless of the test temperature, the strengths in the circumferential direction were lower by approximately 5~10 % than those in the axial direction. In addition, the test data revealed that the reduction in the yield and tensile strengths of the Alloy 690TT SG tube with the test temperature was more significant than that estimated by the temperature correction factor of ASME Sec.II.
Keywords
Alloy 690TT; Steam Generator Tube; Tensile Property; Design Temperature; Tube Specimen; Ring Specimen;
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