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| STRESS CORROSION CRACKING IN HIGH STRENGTH STEEL UNDER MODE Ⅲ LOADING |
| by CHU Wuyang; XIAO Jimei (Chi-Mei Hsiao); ZHU Shuyan; XU Baiqi (Beijing University of Iron and Steel Technology) |
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Cite this article:
by CHU Wuyang; XIAO Jimei (Chi-Mei Hsiao); ZHU Shuyan; XU Baiqi (Beijing University of Iron and Steel Technology). STRESS CORROSION CRACKING IN HIGH STRENGTH STEEL UNDER MODE Ⅲ LOADING. Acta Metall Sin, 1986, 22(6): 73-78.
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Abstract Stress corrosion cracking (SCC) of high-strength steel in aqueous medium in comparison to hydrogen induced cracking (HIC) during dynamic charging under mode Ⅲ loading was investigated. The threshold stress intensities for SCC and HIC under mode Ⅲ and Ⅰ were measured and compared. It was found that both SCC and HIC under mode Ⅲ loading initiated and propagated on the planes inclined at 45°to the notch plane, differing from that under mode Ⅰ loading. The fracture surfaces, however, revealed intergranular facets, similar to that under mode Ⅰ loading. The addition of thiourea decreases the threshold value for SCC under mode Ⅲ and Ⅰ loading, which was still higher than that for dynamic charging. The threshold values of both SCC and HIC under mode Ⅲ are larger than that under mode Ⅰ, i. e., K_(ⅢH)K_(ⅠH), K_(ⅢSCC)K_(ⅠSCC). Based upon the fracture mechanics analysis, this difference is attributed to the different equilibrium hydrogen concentration between mode Ⅲ and Ⅰ loading. These results give enough evidence that the SCC mechanism in high strength steel under mode Ⅲ loading is also related to hydrogen induced cracking.
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Received: 18 June 1986
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