Aspects of fracture morphology exhibited in the stress corrosion behavior of Ti-155 in methanol-hydrochloric acid solution
- Univ. of Zimbabwe, Harare (Zimbabwe). Dept. of Metallurgical Engineering
- Univ. of Leeds (United Kingdom). School of Materials
Stress corrosion cracking (SCC) of Ti-155 was investigated in methanol-hydrochloric acid solution in preexposure and anodic polarization experiments using specimens with tensile axis in the parallel or transverse orientation to the rolling direction. Intergranular penetration data showed a dependence of the intergranular corrosion process on preexposure time. Susceptibility to SCC increased with increasing preexposure time and applied anodic current density. Fractographic analysis by scanning electro microscope (SEM) of fractured specimen surfaces in preexposure and anodic polarization experiments showed a fracture morphology comprised of intergranular at the exposure surface edge, an intermediate transgranular cleavage zone, and a terminal ductile region. These observations supported the view that intergranular fracture and transgranular cleavage occurring during SCC of titanium in MeOH-HCl solution is caused by mechanisms related to anodic dissolution and hydrogen embrittlement (HE), respectively. A mechanism to describe the simultaneous occurrence of dissolution and HE at the grain boundary was suggested.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 477472
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 4 Vol. 53; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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