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SAW 법으로 용접된 Type 316LN 강의 크리프 성질
김우곤(W. G. Kim),윤송남(S. N. Yin),류우석(W. S. Ryu),이원(Won Yi) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The creep properties have been evaluated for type 316LN stainless steel welded by the SAW method. The creep tests were conducted with different stress levels for both the base and weld metals at 550℃ and 600℃. The results of the creep-rupture time of the weld metal did not show a large difference when compared to those of the base one, though it exhibited a little lower value at 600℃. The creep rate of the weld metal was lower than that of the base one at the same stress and rupture-time conditions. The creep-rupture ductility of the weld metal is found to be decreased by about 60%, compared to the base one. This is due to the decreasing of tensile elongation and the increasing of the yield stress in the weld metals.
Type 316LN 스테인리스강의 크리프 수명예측과 오차분석
이원(W. Yi),윤송남(S.N. Yin),김우곤(W.G. Kim),류우석(W.S. Ryu) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Various parametric methods, Larson-Miller (L-M), Orr-Sherby-Dorn (O-S-D), Manson-Haferd (M-H) parameters, and minimum commitment method (MCM), were used to predict longer rupture time from short-term creep data. A number of the creep data were collected through literature surveys and experimental data produced in KAERI for predicting the creep life of type 316LN SS. Polynomial equations for predicting the creep life were obtained by the time-temperature parameters (TTP) and the MCM. Standard error (SE) and standard error of mean (SEM) values were compared for the each method with temperatures. The TTP methods were good in the creep-life prediction, but the MCM was much superior to the TTP ones at 700℃ and 750℃. The MCM was found to be lower in the SE values compared to the TTP methods.