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슈퍼2상 스테인리스강의 기계적 성질에 미치는 W첨가의 영향
김수천(S. C. Kim),김윤규(Y. K. Kim),최한글(H. G. Choi),강창롱(C. Y. Kang) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
To recognize the effect of W addition on the mechanical properties in super duplex stainless steel, different W content is prepared. And we makes an experiment on different aging heat treatment conditions. At the result of, the effect of aging temperature is low precipitation of sigma phase at 475 °C, but precipitation of sigma phase at 600℃ and 750℃ is rapidly increased. But at 900 °C, precipitation of sigma phase is lower than former times, because precipitation region of sigma phase is missed. Therefore, hardness and strength are higher than former times, but impact values and elongation are decreased. At 600℃, the effect of aging time is low precipitation of sigma phase at the shortest time, but the longer time aging heat treatment, the more increase sigma phase increased. Therefore, hardness and strength are higher than the shortest time, but impact values and elongation are decreased. Specimen of W added decrease precipitation of sigma phase than specimen of W not added, because specimen's of W added sigma phase is decreased that Mo is substituted to W, relatively low diffusion coefficient. So, hardness and strength of specimen of W not added are higher than specimen of W added, but impact values and elongation of specimen of W not added are lower than specimen of W added.
원심주조된 B50A349A내열강의 미세조직 및 기계적성질에 미치는 단조조건의 영향
이상명 (S. M. Lee),김윤규 (Y. K. Kim),최한글 (H. G. Choi),강창롱 (C. Y. Kang) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The aim of study is investigated to develop the optimum forging conditions on B50A349A heat resistance steel. The results obtained from this study are as follow: With increase the forging rate, the hardness and tensile strength wase increased, but impact value and elongation wase decreased. With increase the forging start temperature, the hardness and tensile strength wase increased, while, impact value and elongation wase decreased. With increase the forging finishing temperature, the tensile strength and hardness wase increased, but elongation and impect value was decreased..