在连续充氢条件下，就４２ＣｒＭｏ／０．５ｍｏｌ／ＬＨ２ＳＯ４体系短时过载对氢致断裂寿命的影响进行了研究。实验结果表明：（１）在材料服役的早期加入短时过载将使氢致断裂寿命延长，（２）在材料服役的后期加入短时过载则会缩短氢致断裂寿命。文中从过载引起残余压应力、位错屏蔽效应和过载损伤等方面进行了分析与讨论。
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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