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상온과 343℃에서 Alloy 690 증기발생기 전열관의 인장물성치 평가
김진원(Jin Weon Kim),엄기현(Ki Hyeun Eom) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This study conducted tensile tests on Alloy 690 SG tube material at RT and 343℃ in air environment. In the tests tube and ring specimens were used to obtain axial and circumferential properties at both temperatures, respectively. The tensile properties and deformation behaviors were investigated at different temperatures. Yield point phenomena appeared at both temperatures, and serrated flow appeared at 343℃. The yield and tensile strengths were reduced at 343℃ compared with RT, but the change of elongation and hardening behavior with test temperature was not significant. Also, it showed that the reduction of yield and tensile strengths at 343℃ was more significant in comparison with that suggested by ASME code Sec.II. This means that the prediction of yield and tensile strengths at 343℃ for Alloy 690TT by ASME code Sec.II. is not conservative.