STRESS CORROSION CRACKING IN HIGH STRENGTH STEEL UNDER MODE Ⅲ LOADING

Acta Metall Sin

1986, Vol. 22

Issue (6): 73-78 DOI:

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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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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.

Received: 18 June 1986

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1986/V22/I6/73

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