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TRIP형 복합조직강의 미세조직 및 인장성질에 미치는 화학조성의 영향
이기열 ( K. Y. Lee ),장우양 ( W. Y. Jang ),강조원 ( J. W. Kang ) 한국열처리공학회 2003 熱處理工學會誌 Vol.16 No.3
N/A The effect of chemical composition on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types: a granular type in a steel containing higher Si and a film type in a steel having higher C. For the case of higher C-containing steel with a tensile strength of 860 MPa and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable Si and Mn, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher Mn content exhibited the similar behavior shown in dual phase steel.
이정수(Lee Jeong-soo),서승일(Seo S. I),이기열(Lee K. Y) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
Large extrusions of aluminium alloy can be more general and useful as structural material of rolling stocks to reduce weight and labor cost than mild steel and stainless steel. Our company is studying aluminium coach body will be made of 6005A and A5083 alloy. In this paper, at first, detailed finite element analysis is carried out to calculate the orthotropic material properties of aluminium extrusions. And then, global strength evaluation of coach body is carried out according to UIC 566 OR code.