Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Origins of Surface Cracks at Room Temperature in Fe-Cr-Al Alloy Billets

Fe-Cr-Al계 합금 빌렛의 상온 표면균열 원인에 관한 연구

  • 김상원 (포항산업과학연구원 부품신소재연구센터 신금속연구팀) ;
  • 박종혁 (창원특수강 기술연구소) ;
  • 김인배 (창원특수강 기술연구소)
  • Published : 2004.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

Metallurgical and mechanical experiments were performed to explain unexpected surface cracks encountered in fabricating ground rolled-billet of Fe-Cr-Al alloys at room temperature. The toughness of these alloys containing between 220 and 236 ppm (C+N) has been assessed using notched-bar impact tests. According to our results, with a larger grain size, a higher interstitial content of (C+N) or a smaller size of precipitates, ductile to brittle temperature(DBTT) increased and absorbed energy decreased at room temperature. These results suggest that the surface cracks at room temperature stem from a poor resistance to brittle fracture, due to dislocation movement by the finely dispersed carbides within grains under the condition of higher (C+N) content.

Keywords

References

  1. M. Sugiyama, T. Nakayama, J. Jpn. Inst. Met., 23(9), 530 (1959) https://doi.org/10.2320/jinstmet1952.23.9_530
  2. Metals Handbook Ninth Edition, 3, p.640, Metal park, Ohio (1980)
  3. S. Yamada and H. Oosawa, Denki Seiko, 38(3) 136 (1967) https://doi.org/10.4262/denkiseiko.38.136
  4. S. L. Case and K. R. Van Horn, Aluminum in Iron and Steel, 265 (1953)
  5. E. C. Bain, R. H. Aborn, and J. J. B. Rutherford, Trans, Am. Soc. Steel Treat., 21, 481 (1933)
  6. H. F. Ebling and M. A. Scheil, ASTM STP No. 369, 275 (1965)
  7. J. J. Demo, NACE reprint No. 23, Conf. Nat. Assoc. Corrosion Engineers, Cleveland (1968)
  8. J. J. Demo, Corrosion, 27, 531 (1971) https://doi.org/10.5006/0010-9312-27.12.531
  9. N. J. Petch, Fracture, p.305, Wiley, New York (1959)
  10. A. H. Cottrell, Transactions, Metallurgical Society of American Institute of Mining, Metallurgical, and Petroleum Engineers, 212, 192 (1958)
  11. T. L. Hohnston, In Fracture, p.1, New York (1966)
  12. M. Henthorne, ASTM STP No. 516, 66 (1972)
  13. J. Hochmann, Rev. Metall., 48, 734-758 (1951) (Brutcher trans. no. 2981) https://doi.org/10.1051/metal/195148100734
  14. H. Thielsch, Weld. J. Res. Suppl., 30, 209-s (1951)
  15. T. A. Pruger, Steel Horiz, 13, 10 (1951)
  16. A. Plumtree and R. Gullberg, J. Test. Eval., 2(5), 331 (1974) https://doi.org/10.1520/JTE10115J