Stress corrosion cracking and hydrogen-induced cracking of amorphous Fe74.5Ni10Si3.5B9C2 |
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Authors: | JX Guo |
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Affiliation: | Department of Materials Physics, University of Science and Technology Beijing, 30 Xue Yuan Lu, Beijing 100083, China |
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Abstract: | Stress corrosion cracking (SCC) in NaCl solution and hydrogen-induced cracking (HIC) during dynamic charging of Fe74.5Ni10Si3.5B9C2 amorphous alloy were investigated through sustained load tests. The normalized threshold stress of SCC was σSCC/σF=0.04, where σF is fracture strength in air. Anodic polarization and addition of As2O3 into the solution did not change σSCC/σF, but cathodic polarization increased σSCC/σF from 0.04 to 0.31. Cathodic polarization increased but anodic polarization decreased the time to failure during SCC at the constant load of σ=0.27σF.The normalized threshold stress of HIC, σHIC/σF, was linearly decreased with the increase in logarithm of hydrogen concentration (C0) and kept a minimum constant when C0 was larger than a critical value, i.e., σHIC/σF=1.58−0.36lnC0 (C0?74.4 wppm) and 0.1 (C0?74.4 wppm). The threshold stress of HIC during dynamic charging with the maximum current was larger than that of SCC at open-circuit potential. Fracture surfaces of HIC were also different with that of SCC. Experiments indicated that SCC of the amorphous alloy in the NaCl solution is controlled by anodic dissolution process instead of hydrogen. |
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Keywords: | Amorphous alloy Stress corrosion cracking Hydrogen-induced cracking |
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