서지주요정보
18Cr-9Ni 스테인리스강의 질소함량에 따른 크리프-파단 특성 연구 = The study of nitrogen effect on the characteristics of creep-rupture in 18Cr-9Ni austenitic steels
서명 / 저자 18Cr-9Ni 스테인리스강의 질소함량에 따른 크리프-파단 특성 연구 = The study of nitrogen effect on the characteristics of creep-rupture in 18Cr-9Ni austenitic steels / 신재경.
저자명 신재경 ; Shin, Jae-Kyoung
발행사항 [대전 : 한국과학기술원, 2005].
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등록번호

8016122

소장위치/청구기호

학술문화관(문화관) 보존서고

MAME 05019

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초록정보

It is known that the addition of nitrogen enhances the several mechanical properties of austenitic stainless steels. But most of the reported investigations for the effect of the nitrogen on the mechanical properties are studied under 600$^\circ$ The purpose of this study is to investigate the effect of nitrogen on creep-rupture behaviors of 18Cr-9Ni stainless steels with different nitrogen contents in varying stress and temperature. The influence of nitrogen on creep-rupture properties for 18Cr-9Ni stainless steels was investigated in air atmosphere at 700 and 800$^\circ$. Under creep-rupture test, 18Cr-9Ni-0.14N steel had longer rupture lives than those of 18Cr-9Ni-0.08N steel at 700 and 800$^\circ$. From the observations of fracture surface, it can be known that the Cr-rich carbides are precipitated mainly at the grain boundary. Comparing the ratio of the linear density of the precipitate particles, 18Cr-9Ni-0.14N steel has lower grain boundary carbide density than 18Cr-9Ni-0.08N steel has, which has been known to provide the preferential site for the cavity nucleation. So, the reason why 18Cr-9Ni-0.14N steel has longer creep-rupture lives than those of 18Cr-9Ni-0.08N steel can be explained that nitrogen retards carbide nucleation at grain boundary by inhibiting diffusion of Cr to grain boundary, 18Cr-9Ni-0.14N steel has lower grain boundary carbide density, which results in retard cavity nucleation. Finally, it can be said that the addition of nitrogen is beneficial for real structural materials which are subjected to complex loading at high temperature, because the addition of nitrogen can increase strength and decrease the carbide density to inhibit cavity nucleation.

서지기타정보

서지기타정보
청구기호 {MAME 05019
형태사항 viii, 58 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jae-Kyoung Shin
지도교수의 한글표기 : 남수우
지도교수의 영문표기 : Soo-Woo Nam
학위논문 학위논문(석사) - 한국과학기술원 : 신소재공학과,
서지주기 참고문헌 : p. 56-58
주제 크리프-파단
질소
탄화물
오스테나이트 스테인리스강이산화탄소
Creep-rupture
nitrogen
carbide
austenitic stainless steel dioxidere Distributionnttern
recognitionse Boundary(MPB)
Landau-Devonshire free energy equation
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