DOI QR코드

DOI QR Code

An Nondestructive Evaluation of Degraded Damage for Superaustenitic Stainless Steel

슈퍼 오스테나이트 스테인리스강의 열화손상에 대한 비파괴적 평가

  • 권일현 (전북대학교 기계공학부, 자동차신기술연구소) ;
  • 백승세 (전북대학교 대학원 정밀기계공학과) ;
  • ;
  • 유효선 (전북대학교 기계공학부, 자동차신기술연구소)
  • Published : 2002.07.01

Abstract

This research was undertaken to clarify effects of thermal aging on electrochemical and mechanical properties of superaustenitic stainless steel and to detect the material degradation nondestructively. The steel was artificially aged at $300{\sim}650^{\circ}C$ for $240{\sim}10,000h$ and the mechanical properties were investigated at $-196{\sim}650^{\circ}C$ using small punch(SP) test. Also, the change in electrochemical properties caused by effects of thermal aging on superaustenitic stainless steel was investigated using electrochemical anodic polarization test in a KOH electrolyte. Carbides and ${\eta}-phase(Fe_2Mo)$ precipitated in the grain boundaries seem to deteriorate the mechanical properties by decreasing cohesive strength in the grain boundaries and to promote the current density observed in electrochemical polarization curves, The electrochemical and mechanical properties of superaustenitic stainless steel decreased significantly in the specimen aged at $650^{\circ}C$ corresponding to the sensitization temperature for conventional austenitic stainless steels.

Keywords

References

  1. Marshall, P., 1994, 'Austenitic Stainless Steels,' Elsevier Applied Science Publishers, UK, pp. 354-398
  2. Kane, R. D., 1993, 'Super Stainless Steels : Resist Hostile Environments,' Advanced Materials and Processes, pp. 16-20
  3. Miura, M., and Ogawa, K., 1988, 'Progress on Stainless Steels and Their Weldability,' Journal of the JWS, Vol. 57, No.6, pp. 421-426
  4. Matsushima, I., 1992, 'Corrosion and Its Mitigation of Welded Joints in Stainless Steel,' Journal of the JWS, Vol. 61, No.3, pp. 144-152
  5. Lu, Y., Shoji, T., Takahashi, H., and Saito, Y., 1986, 'Material Characterization Procedure of Degradation of Austenitic Stainless Steels by Use of Small Punch Test and Electrochemical Potentiokinetic Reactivation (EPR) Method,' Journal of The Society of Materials Science Japan, Vol. 36, No. 402, pp. 296-302
  6. Saito, Y., Shoji, T., and Watanabe, Y., 1991, 'Development of Nondestructive On-Site Measurement Techniques by Means of an Electrochemical Method for Material Degradation of S/H SUS Steel Tubes of Fossil Boilers,' Transactions of the JSME, A, Vol. 57, No. 538, pp. 1442 -1448 https://doi.org/10.1299/kikaia.57.1442
  7. KRISS-97-101-IR, 'Development of Sem-nondestructive Evaluation Technique of Toughness Degradation (3rd Year),' pp. 1-288
  8. You, H. S., Song, M. S., Song, G. W., and Lyu, D. Y., 2000, 'Degradation Damage Evaluation of High Temperature Structural Components by Electrochemical Anodic Polarization Test,' Transactions of the KSME, A, Vol. 24, No. 6, pp. 1398-1407