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논문 기본 정보

자료유형
학술저널
저자정보
He, Yinsheng (School of Nano & Advanced Materials Engineering, Changwon National University) Chang, Jungchel (Technology Policy and Planning Department, Korea Electric Power Corporation) Lee, Je-Hyun (School of Nano & Advanced Materials Engineering, Changwon National University) Shin, Keesam (School of Nano & Advanced Materials Engineering, Changwon National University)
저널정보
한국재료학회 한국재료학회지 한국재료학회지 제25권 제11호
발행연도
2015.1
수록면
607 - 611 (5page)

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초록· 키워드

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The microstructural evolution of Grade 91 tempered martensite ferritic steels heat treated at $760{\sim}1000^{\circ}C$ for two hours was investigated using scanning electron microscopy(SEM), energy disperse spectroscopy(EDS), electron backscattered diffraction (EBSD), and transmission electron microscopy(TEM); a microhardness tester was also employed, with a focus on the grain and precipitate evolution process as well as on the main hardening element. It was found that an evolution of tempered martensite to ferrite($760{\sim}850^{\circ}C$), and to fresh martensite($900{\sim}1000^{\circ}C$), occurred with the increase of temperature. Simultaneously, the parabolic evolution characteristics of the low angle grain boundary(LAGB) increased with the increase of the heating temperature(highest fraction of LAGB at $925^{\circ}C$), indicating grain recovery upon intercritical heating. The main precipitate, $M_{23}C_6$, was found to be coarsened slightly at $760{\sim}850^{\circ}C$; it then dissolved at $850{\sim}1000^{\circ}C$. Besides this, $M_3C$ cementite was formed at $900{\sim}1000^{\circ}C$. Finally, the experimental results show that the hardness of the steel depended largely on the matrix structure, rather than on the precipitates, with the fresh martensite showing the highest hardness value.

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