Fractal characteristics of stress corrosion cracking in SNCM 439 steel having different prior-austenite grain sizes
✍ Scribed by Masashi Kurose; Yukio Hirose; Toshihiko Sasaki; Yasuo Yoshioka
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 515 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
An approach by fractal geometry was examined for the SCC problem on a Ni-C~Mo steel.
Stress corrosion tests were conducted in 3.5% NaCI solution by using SNCM439 steel specimens. These specimens had different prior-austenite grain sizes due to variations in heat treatment.
After summarizing the results of analysis, we explain the profiles of stress corrosion cracks having fractal characteristics. The relevant fractal dimension D was about 1.05 for the region where the intergranular cracking was predominant, while D was about 1.10 for the region having mixed fracture of intergranular and transgranular cracking. The fractal analysis concluded that the crack growth rate da/dt depends on the grain size d, but not stress intensity factor K. The investigations of crack growth phenomena were seen to be an important factor to explain the mechanism.