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논문 기본 정보

자료유형
학술저널
저자정보
Kang-Suk An (Kookmin University) Shin Woong Jeong (Kookmin University) Hyeong Jun Bea (KISWIRE R&D Center) Won Jong Nam (Kookmin University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.6
발행연도
2016.1
수록면
995 - 1,002 (8page)

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초록· 키워드

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The formation of abnormal structures and their effects on reduction of area (RA) were investigated in eutectoidsteels transformed at different temperatures ranging from 560 °C-650 °C. The occurrence of abnormalstructures, such as upper bainite, degenerate pearlite, free ferrite, and grain boundary cementite, was confirmed. The volume fraction of upper bainite and degenerate pearlite decreased on increasing the transformationtemperature, while the amount of free ferrite increased. As the transformation temperature increased, RAincreased, reached a maximum, and then decreased, while the tensile strength continuously decreased. The crackformations during the tensile test could be classified into three types: tearing, shear cracking, and void formation/coalescence. The decrease of the ductility at low transformation temperatures was attributed to theincreased amount of upper bainite and degenerate pearlite, since the formation of cracks occurred by tearinginterfaces or by void formation at abnormal structures during the tensile test. Meanwhile, the decrease inRA at high transformation temperatures was attributed to the occurrence of shear cracking rather than thepresence of abnormal structures.

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