Fe-29%Ni-17%Co 저열팽창 합금의 피로 특성에 미치는 알파상의 영향

김민종; 권진한; 조규상; 이기안; Min-Jong Kim; Jin-Han Gwon; Kyu-Sang Cho; Kee-Ahn Lee

Korean Journal of Materials Research, Vol.24, No.9, 481-487, September, 2014

DOI10.3740/MRSK.2014.24.9.481 Export Citation

Fe-29%Ni-17%Co 저열팽창 합금의 피로 특성에 미치는 알파상의 영향

Effects of Alpha Phase on the Fatigue Properties of Fe-29%Ni-17%Co Low Thermal Expansion Alloy

김민종, 권진한, 조규상¹, 이기안^†

국립 안동대학교 신소재공학부
¹동양대학교 철도차량학과

Min-Jong Kim, Jin-Han Gwon, Kyu-Sang Cho¹, and Kee-Ahn Lee^†

Dept. of Advanced Mater. Eng, Andong National University, Andong 760-749, Korea
¹Railway Vehicles Engineering, Dongyang University, Youngju 750-711, Korea

E-mail:

The effect of alpha phase on the fatigue properties of Fe-29%Ni-17%Co low thermal expansion alloy wasinvestigated. Two kinds of alloys (Base alloy and Alpha alloy) were prepared by controlling the minimal alloy composition. Microstructure observation, tensile, high-cycle fatigue, and low-cycle fatigue results were measured in this study. The Base alloy microstructure showed typical austenite γ phase. Alpha alloy represented the dispersed phase in the austenite γ matrix. As a result of tensile testing, Alpha alloy was found to have higher strengths (Y.S. & T.S.) and lower elongation compared to those of the Base alloy. High cycle fatigue results showed that Alpha alloy had a higher fatigue limit (360MPa) than that (330MPa) of the Base alloy. The Alpha alloy exhibited the superior high cycle fatigue property in all of the fatigue stress conditions. SEM fractography results showed that the alpha phase could act to effectively retard both fatigue crack initiation and crack propagation. In the case of low-cycle fatigue, the Base alloy had longer fatigue life in the high plastic strain amplitude region and the Alpha alloy showed better fatigue property only in the low plastic strain amplitude region. The fatigue deformation behavior of the Fe-29%Ni-17%Co alloy was also discussed as related with its microstructure.

Keywords:low thermal expansion;Fe-29%Ni-17%Co;alpha phase;fatigue;mechanical property

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[1] Scott H, Trans. Am. Inst. Min. Met. Eng., 89, 506 (1930)

[2] B. Gehrmann, U. Heubner, A. Kolb-Telieps and E. F. Wassemann, International Symposium on the Invar Effect (Cincinnati, OH, October 1996). ed. E. J. Wittenauer (The Minerals, Metals & Materials Society, Warrendale, PA, 1996) p.105

[3] L. L. Harner, International Symposium on the Low Thermal Expansion Alloys and Composites (Chicago, IL, November 1992). eds. J. J. Stephens and D. R. Fear (The Minerals, Metals & Materials Society, Warrendale, PA, 1994) p.3

[4] ASTM, 10.04, F15-78 (1993).

[5] Kim BS, Kim MH, Kim SW, Choi DK, Son YB, J. Kor. Cer. Soc., 36, 1228 (1999)

[6] Rooney DT, Castello NT, Cibulsky M, Abbott D, Xie D, Microelectronics Reliability, 44, 275 (2004)

[7] Zhao Y, Basaran C, Carwright A, Dishongh T, Mechanics of Materials, 32, 161 (2000)

[8] Basaran C, Chandaroy R, Applied Mathematical Modelling, 22, 601 (1998)

[9] Lee JH, Kim HJ, Kang IK, Kim HS, Ahn HG, J. Kor. Inst. Met. & Mater., 31, 867 (1993)

[10] Schlosser WF, J. Phys. Chem. Solids, 32, 939 (1971)

[11] Zakharov AI, Kravchenko TA, Barkaya DS, Met. Sci. Heat Treat., 30, 129 (1988)

[12] K. S. Dogra, International Symposium on the Low Thermal Expansion Alloys and Composites (Chicago, IL, November 1992). eds. J. J. Stephens and D. R. Fear (The Minerals, Metals & Materials Society, Warrendale, PA, 1994) p.113

[13] J. H. Riggs, International Symposium for Testing and Failure Analysis (Los Angeles, CA, October 1990). (ASM International, Materials Park, OH, 1990) p.301

[14] J. A. Wasynczuk, W. D. Hanna, F. D. Ross and T. A. Freitag, Fatigue of Electronic Materials, p.110, ASTM International, Atlanta, USA (1994).

[15] S. S. Manson and M. H. Hirschberg, Fatigue: An Inter Approach, p.133, Syracuse University Press, N.Y., USA (1964).

[16] Deters M, Williams JC, Metall. Trans. A, 15A, 1588 (1984)

[17] Suresh S, Ritchie RO, International Metals Reviews, 29, 445 (1984)

[18] Raman SGS, Padmanabhan KA, Mater. Sci. and Tech., 10, 614 (1994)

[19] Mediratta SR, Ramaswamy V, Singh V, Rao PR, Scr. Metall., 24, 793 (1990)

[20] Aran A, Turker H, J. Mater. Sci. Letters, 9, 1407 (1990)