서지주요정보
12%Cr-Mo-V-Nb 강에서 입계크기가 크립특성에 미치는 영향 = Effects of prior austenite grain size on creep properties of 12%Cr-Mo-V-Nb steel
서명 / 저자 12%Cr-Mo-V-Nb 강에서 입계크기가 크립특성에 미치는 영향 = Effects of prior austenite grain size on creep properties of 12%Cr-Mo-V-Nb steel / 안은철.
저자명 안은철 ; Ahn, Eun-Cheol
발행사항 [대전 : 한국과학기술원, 1991].
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소장정보

등록번호

8002042

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 9117

SMS전송

도서상태

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대출가능

반납예정일

초록정보

Researches are underway worldwide to improve the performance of high chromium ferritic steels for high temperature applications up to 650℃. To investigate the effects of austenitizing temperature on the mechanical and creep strength of the 12% Cr-Mo-V-Nb steel, the austenitizing temperatures of 1000℃(2hr), 1050℃(2hr),1100℃(1hr) and 1150℃(1hr) were used. The creep test performed at 650℃ under constant load ranging from 100MPa to 150MPa. The yield strength and ultimate tensile strength increased but the elongation and reduction of area decreased with increasing austenitizing temperature. Especially the Charpy absorbed energy drastically decreased and fracture mode changed from dimple to quasi-cleavage. These results can be explained by comparing the finess extent of martensite structure. The creep rupture time increased with austenitizing temperature. The increase in austenitizing temperature resulted in not only an increase in grain size but also a decrease in the amount of undissolved carbides such as $M_{23}C_6$ and NbC. The dissolution of more carbide forming elements during the austenitizing treatments at higher temperature make more solid solution hardening and fine carbide precipitations which are benificial for creep rupture strength. However after long time tempering, from the results of tempering at 750℃, carbide coarsened more rapidly in the specimen austenitized at 1150℃ than that of austenitized at 1000℃. From the above results, the optimum austenitizing temperature is between 1050℃ and 1100℃.

서지기타정보

서지기타정보
청구기호 {MMS 9117
형태사항 [iii], 57 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Eun-Cheol Ahn
지도교수의 한글표기 : 유진
지도교수의 영문표기 : Jin Yu
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 56-57
주제 Chromium alloys.
Creep.
Austenite.
크리프. --과학기술용어시소러스
크롬 합금. --과학기술용어시소러스
입자 크기 (지름) --과학기술용어시소러스
Grain size.
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