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| EFFECT OF OVERLOADING ON ENVIRONMENTAL HYDROGEN INDUCED FRACTURE |
| Gao Hua;Yang Xiaolei;Cao Weijie(Shanghai University of Engineering Science) |
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Abstract The effect of short period overloading on the lifetime of environmental hydrogen induced fracture (HIF) for 0.42%C, 0.87%Cr, 0.21%Mo steel in 0.5mol/L H2SO4 solution was studied under continuous hydrogen charging. Experimental results showed that when overloading was applied at the early or intermediate stage of the service period, the HIF life become longer; however, if overloading was applied rather late, the HIF life was shortened. It was noticed that hydrogen absorption, hydrogen transportation and accumulation,crack initiation and propagation were at only dependent on the electro-chemistry condition, but also on the stress-strain state and history. These observations were explained in terms of residual compression stress, dislocation shielding and damage caused by overloading.
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Received: 25 August 1995
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| 1HydrogenEmbrittlementTed．ASTM．STP543,19742高桦,曹卫杰．中国腐蚀与防护学报,1991,11(2):1633王克仁,徐纪林,高桦．SCIENTIASINICA,1979,XXII:579-5834PookLP．Eng．Fract．Mech,1971,3:205-2125吴世丁,陈廉,刘民治．金属学报,1990,26(2):A86-A916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):237-2447PageRA,GerberichWW．Metall．Thans．1982,13A(2):305-311 |
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