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Abstract Stress corrosion cracking(SCC) and hydrogen induced cracking(HIC) of Type 321 stainless steel under mode Ⅱ loading were investigated with notched specimens. Experimental results showed that SCC in boiling 42% MgCl_2 solution initiated at the maximum normal stress site, i. e., at= -110° on the notch surface, rather than at the maximum shear stress site, i. e., at=80°, with orientation perpendicular to the direction of the maximum normal stress. However, HIC during dynamic charging initiated at the maximum shear stress site at higher E_Ⅱ or at the maximum normal atress site at lower K_Ⅱ. The threshold value of SCC of the Type 321 steel under mode Ⅱ loading was K_(Ⅱscc)/K_(Ⅱx)=0. 19, which was much lower than that of HIC during dynamic charging, i. e., K_(ⅡH),/K_(Ⅱx)=0. 59. The SCC fracture surface under mode Ⅱ loading different from those of HIC in morphology. These results lend support to the statement that SCC of austenitic stainless steel in boiling 42% MgCl_2 soluion is the anodic path dissolution mechanism and the maximum normal stress rather than the maximum shear stress plays a Controlling part in the SCC initiation.
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Received: 25 August 1986
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Cite this article:
Qiao Lijie Chu Wuyang Hsiao Chimei and Lu Jiandong(Beijing Univ; of Iron and Steel Tech). STRESS CORROSION CRACKING AND HYDROGEN INDUCED CRACKING IN AUSTENITIC STAINLESSSTEEL UNDER MODE Ⅱ LOADING. J Chin Soc Corr Pro, 1986, 6(4): 273-282.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1986/V6/I4/273
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