THE EFFECT OF NON-PROPORTIONAL OVERLOADING ON ENVIRONMENTAL HYDROGEN INDUCED FRACTURE

J Chin Soc Corr Pro

1996, Vol. 16

Issue (3): 181-186 DOI:

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THE EFFECT OF NON-PROPORTIONAL OVERLOADING ON ENVIRONMENTAL HYDROGEN INDUCED FRACTURE

CAO Weijie;YANG Xiaolei;GAO Hua (Shanghai University of Engineering Science)

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Abstract The effect of short period non-proportional overloading on environmental hydrogen induced fracture life of 42CrMo steel in 0.5 mol/L H2SO4solution was studied under continuous hydrogen charging condition.A weight loading system was employed in the study. Experimental results showed that non-proportional overloading might cause more severe retardation than proportional one. The mechanisms responsible for retardation of subsequent crack growth were discussed. The influence of overloading was dependent on integral effect of the following faCtors: (1) crack branching,which decreassed significantly the crack growth driving force; (2) residual compressive stresses existing in the overloading plastic zone, which reduced effective stress intensity factors; (3) effect of dislocation shielding on retarding hydrogen transportation as well as accumulation; and (4) overloading damage, which might shorten HIF life.

Key words: Overloading effect Hydrogen induced fracture High strength steel

Received: 25 June 1996

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CAO Weijie;YANG Xiaolei;GAO Hua (Shanghai University of Engineering Science). THE EFFECT OF NON-PROPORTIONAL OVERLOADING ON ENVIRONMENTAL HYDROGEN INDUCED FRACTURE. J Chin Soc Corr Pro, 1996, 16(3): 181-186.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1996/V16/I3/181

1高烨,杨晓雷,曹卫杰．中国腐蚀与防护学报,1995,15(4):2542高烨,曹卫杰．中国腐蚀与防护学报,1991;11(2):1633高桦,曹卫杰,方昌鹏,刘树望,陈廉．中国腐蚀与防护学报,1993;13(3):2374BarberaALa,MarchettiM,TizziS．InternationalJournalofWacture,1990,43:255ChatterjeeSN．solidsStruetures,1975,11:5216SureshS．FatigueofMaterials．CambridgeUniversityPress,1991．1417PoohLPEng．Fract．Mech,1971,3:2058路民旭,郑修麟．中国腐蚀与防护学报,1994,14(3):193

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