페라이트기 9Cr 내열강의 크리프-피로손상에 따른 미세조직 및 초음파 비파괴평가

김정석; 권숙인; 박익근; Chung-Seok Kim; Sook-In Kwun; Ik-Keun Park

Korean Journal of Materials Research, Vol.17, No.8, 425-432, August, 2007

DOI10.3740/MRSK.2007.17.8.425 Export Citation

페라이트기 9Cr 내열강의 크리프-피로손상에 따른 미세조직 및 초음파 비파괴평가

Microstructural Evolution and Ultrasonic Nondestructive Evaluation During Creep-Fatigue of 9Cr Ferritic Heat-Resisting Steel

김정석, 권숙인^†, 박익근¹

고려대학교 재료공학부
¹서울산업대학교 기계공학과

Chung-Seok Kim, Sook-In Kwun^†, and Ik-Keun Park¹

Division of Materials Science and Engineering, Korea University, Seoul, Korea
¹Department of Materials and Engineering, Seoul National University of Technology, Seoul, Korea

E-mail:

The microstructural evolution of ferritic 9Cr-1Mo-V-Nb steel, subjected to creep-fatigue at , was evaluated nondestructively by measuring the ultrasonic velocity. The variation of the ultrasonic velocity with the fatigue life fraction exhibited three regions. In the first region (<0.2), a significant increase in the velocity was observed, followed by a slight increase between the fatigue life fractions of and , and then a decrease in the final region. The change of the ultrasonic velocity during creep-fatigue was interpreted in relation to the microstructural properties. This study proposes an ultrasonic nondestructive evaluation method of quantifying the level of damage and microstructural change during the creep-fatigue of ferritic 9Cr-1Mo-V-Nb steel.

Keywords:creep-fatigue;9Cr-1Mo-V-Nb steel;ultrasonic velocity;heat-resisting steel;nondestructive evaluation

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[4] Ennis PJ, Zielinska-Lipiec A, Wachter O, Czyrska-Filemonowicz A, Acta Mater., 45, 4901 (1997)

[5] Abe F, Horiuch T, Taneike M, Sawada K, Mater. Sci. Eng. A, 378, 299 (2004)

[6] Eggeler G, Earthman JC, Nilsbang N, Ilschner B, Acta Metal., 37, 49 (1989)

[7] Luxenburger S, Arnold W, Ultrasonics, 40, 797 (2002)

[8] Dobmann G, Kroning M, Theiner W, Willems H, Fiedler U, Nucl. Eng. Design, 157, 137 (1995)

[9] Gupta S, Ray A, Keller E, Inter. J. Fatigue, 29, 1100 (2007)

[10] Byeon JW, Kim CS, Kwun SI, Phys. Stat. Sol. B, 241, 1756 (2004)

[11] Mclntire P, Nondestructive Testing Handbook, 2nd ed., Vol.7, ASNT, (1999) (1999)

[12] Baray D, Stanley R, Nondestructive Evaluation-A tool for design, manufacturing and service, McGraw-Hill, New York, (1989) (1989)

[13] Cheruvu NS, Metall. Trans., 20, 87 (1989)

[14] Kim CS, Ph. D. thesis, Korea University, Korea, (2007) (2007)

[15] Williamson GK, Hall WH, Acta Metall., 1, 22 (1953)

[16] Abe F, Mater. Sci. Eng. A, 387, 565 (2004)

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[20] Hattestrand M, Schwind M, Andren HO, Mater. Sci. Eng. A, 250, 27 (1998)

[21] Goebbels K, Materials characterization for process control and product conformity, p.12, CRC press, Florida (1994) (1994)

[22] Lee JE, Kim YC, Ahn JP, Kim HS, Acta Mater., 53, 129 (2005)

[23] Vasudevan M, Palanichamy P, Venkadesan S, Scripta Metall. Mater., 30, 1479 (1994)

[24] Palanichamy P, Vasudevan M, Jayakumar R, Venugopal S, Raj B, NDT & E international, 33, 253 (2000)

[25] Morishita T, Hirao M, Int. Solids Structures, 34, 1169 (1997)

[26] Granato A, Lucke K, J. Appl. Phys., 27, 583 (1956)

[27] Jeong H, Kim DH, Mater. Sci. Eng. A, 337, 82 (2002)