Factors Influencing Fatigue Crack Propagation Behavior of Austenitic Steels

다국어 초록 (Multilingual Abstract)

In the present study, the fatigue crack propagation (FCP) behaviors of austenitic single phase steels, including STS304, Fe18Mn and Fe22Mn with different grain sizes ranging from 12 μm to 98 μm were investigated.
The FCP tests were conducted in air at an R ratio of 0.1 using compact tension specimens and the crack paths and fracture surfaces were documented by using an SEM. The highest ΔKth value of 9.9MPa·m1/2 was observed for the Fe18Mn specimen, followed by 5.2MPa·m1/2 for the Fe22Mn specimen and 4.6MPa·m1/2 for the STS304specimen, showing a substantial difference in the near-threshold FCP resistance for each microstructure. The crack path and fractographic analyses suggested that the near-threshold FCP behavior of these austenitic steels was largely influenced by the degree of slip planarity, as determined by stacking fault energy and grain size,rather than the tensile properties. In the Paris' regime, the slip planarity still played an important role while the tensile properties began to affect the FCP. The FCP behavior of austenitic steels with different microstructural features are discussed based on detailed fractographic and micrographic observations.

참고문헌 (Reference)

1 E. A. Starke, Jr., American Society for Testing and Materials 184-205, 1989

2 F. Erdogan, 1 : 341-, 1965

3 P. Rieux, 27 : 145-, 1979

4 J. Mckittrick, 12 : 1535-, 1981

5 X. J. Wu, 24 : 1373-, 1993

6 R. O. Ritchie, 11 : 368-, 1977

7 A. A. Korda, 428 : 262-, 2006

8 G. T. Gray, III, 14 : 421-, 1983

9 V. S. Sarma, 46 : 185-, 2000

10 T. Kunio, 2 : 237-, 1979

11 Y. Mutoh, 468-470 : 114-, 2007

12 S. K. Koh, 79 : 791-, 2002

13 L. Lawson, 21 : S15-, 1999

14 K. S. Ravichandran, 39 : 1331-, 1991

15 S. Taira, 26 : 93-, 1977

16 A. J. McEvily, 1 : 269-, 1974

17 R. E. Schramm, 6 : 1345-, 1975

18 J. C. Li, 18 : 1669-, 1999

19 E. Hornbogen, 24 : 581-, 1976

20 H. Ishii, 2 : 3441-, 1971

21 J. L. Robinson, 7 : 153-, 1973

22 J. Mckittrick, 12 : 1535-, 1981

23 Y. G. Kim, 42 : 986-, 2011

24 R. O. Ritchie, 24 : 205-, 1979

25 K. Minakawa, Fundamentals and Engineering Applications Engineering Materials Advisory Services, Ltd 373-390, 1982

26 G. R. Yoder, American Society for Testing and Materials 348-365, 1983

27 Y. Ono, 43 : 483-, 2003

28 S. Wang, 100 : 42-, 2000

29 E. A. Strake, Jr, American Institute for Mining, Metallurgical and Petroleum Engineering 43-62, 1984

30 E. O. Hall, 64 : 742-, 1951

31 N. J. Petch, 197 : 25-, 1953

32 S. B. Chakrabortty, 2 : 331-, 1979

33 K. Tanaka, American Society for Testing and Materials 151-183, 1989

34 M. F. Carlson, 11 : 1113-, 1977

35 S. Suresh, 14 : 2375-, 1983

36 C. J. Beevers, "Fundamentals and Engineering Applications" Engineering Materials Advisory Services, Ltd 257-, 1981

37 E. A. Starke, Jr, "Fatigue and Microstructure" American Society for Metals, Metals Park 1978

38 "ASTM Standard E647, Standard Test Method for Measurment of Fatigue Crack Growth Rates, Annual Book of ASTM Standards, vol. 03.01"

39 "ASTM Standard E466, Standard Practice for Conduction Force Controlled Constant Amplitude Axial Fatigue Test of Metallic Materials, Annual Book of ASTM Standards, vol.03.01"

40 권재기, "304 스테인리스강 주조재의 저온 S-N 피로거동 예측" 대한금속·재료학회 49 (49): 774-779, 2011