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오세규(S.K. Oh),정순억(S.U. Jeong),전태언(T.E. Jeon) 한국해양공학회 1996 韓國海洋工學會誌 Vol.10 No.1
This paper deals with a study on improvement of long-time creep life prediction of steam turbine rotor steels by using initial strain method as a new approach at high temperatures of 500 to 700 ℃.<br/> The main result shows that the inital strain method could be reliably utilized to predict and evaluate the long-time creep life as well as creep rupture strength and that the predicting equation for long-time creep life under a certain creep stress at a certain high temperature could be empirically derived out from each initial instantaneous strain measured.
金敏男(M. N. Kim),吳世奎(S. K. Oh),全泰彦(T. E. Jeon),徐康泰(K. T. Seo),朴正培(J. B. Park) 한국해양공학회 1991 韓國海洋工學會誌 Vol.5 No.1
In this paper, an attempt has been taken for improving the weldability of wet welds of TMCP steel plate by shielding around weld arc surroundings. The principal results of this experimental investigation can be summarized as follows :<br/> 1) The cooling rates resulting from wet welds with the developed electrode on TMCP steel plate could be lower than that of the non-shieled wet welds.<br/> 2) The metallurgical characteristics in underwater wet welds of TMCP steel plate and the developed electrode could be improved by shielding around weld arc surroundings.